Search PubMed⌕ Search

SEARCH · Search PubMed

Results for “Solar Activity”

Search indexed PubMed citations on genomics, clinical trials, systematic reviews and public health. Explore titles, authors and supplied subject terms, then open the PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 127 records · Page 7Linked to original sources
PubMed1995

Clinical cosmobiology: the Lithuanian study 1990-1992.

The numbers of deaths from ischaemic heart disease (IHD), stroke (CVA), all accidents except vehicular, vehicular accidents and suicide (overall total, totals for men and women) per month for 36 months (1990-1992) in Lithuania were analysed in relation to: (1) month of the year (1-12); (2) geomagnetic activity; and (3) solar activity. A total of 122227 deaths (64490 men and 57737 women) was studied, and the results compared with those obtained in an earlier study in Israel, differing geographically and climatically from Lithuania. It was shown that the time of year, solar activity, and geomagnetic activity were related to the monthly death distribution, especially regarding death from IHD and suicide. Age and gender differences were apparent in the relationship between death distribution and physical environmental factors. At age > 70 years, many of these relationships change. The monthly distribution of deaths from IHD and suicide are adversely correlated with solar activity and with each other. Differences are presumed in serotoninergic effects as caused by environmental influences.

Accidents↗
PubMedDate not supplied

[Quasi-eleven year modulation of global and spectral features of geomagnetic disturbances].

Variations in spectral characteristics of the Kp-index of geomagnetic activity during the solar activity cycle were studied in order to assess the role of its rhythms in the formation of temporal structure of biological objects. It is shown that most spectral components of the Kp-index are modulated by the 10.5-year periodic rhythms in solar activity variations, while its circasemiseptan component (3.5 days) exhibits an 11-year rhythm. Since it is a circasemiseptan rhythm that is characteristics of biological objects (e.g., unicellular algae), it can be assumed that geophysical rhythms played a substantial role in the formation of biological rhythms during evolution.

Humans↗
PubMed2004

Link between monthly rates of four subtypes of acute myocardial infarction and their corresponding cosmophysical activity parameters.

UNLABELLED: The aim of this study was (1) to examine the relation between the monthly rate of acute myocardial infarction (AMI) and three cosmophysical activity parameters: solar activity (SA), geomagnetic activity (GMA), and cosmic rays activity (CRA) levels; (2) to study whether different subtypes of AMI: ST-elevation MI (STEMI), non-ST-elevation (NSTEMI), Q-wave (Q-waveMI) and non-Q-wave (NQ-wave MI) are linked with monthly cosmophysical indices or with the daily level (I degrees-IV degrees) of GMA. METHODS: For the first question, we studied for 204 consecutive months (1983-1999) 16,683 patients (including 10405 males) with AMI who were included in the Kaunas Registry and for the second, 3824 AMI patients (2342 males), 72-month data. Cosmophysical data were obtained from the Apatity Neutron Monitoring Station of the Russian Academy of Science. RESULTS: According to neutron monitoring data, total AMI and all its subtypes significantly correlated with monthly levels of CRA and inversely correlated with SA and GMA indices (r = 0.32-0.45; p = 0.0007-0.0001). No significant correlation was found between AMI subtypes and the daily level (I degrees-IV degrees) of GMA. All cosmophysical parameters were stronger in female patients. CONCLUSION: The monthly rates of all subtypes of AMI were significantly correlated with CRA and inversely correlated with SA and GMA, more strongly in female patients. We presume that the environmental factors studied here affect the general patho-physiological components of AMI, and that different subtypes are a consequence of the localization and extent of the process.

Adult↗
PubMedDate not supplied

[The relationship of the indices of solar-geomagnetic activity and the autofluctuations in the biological properties of Staphylococcus aureus 209 subcultures in vitro].

The in vitro study of effect of such factors as solar activity and the magnetic field of the Earth revealed their influence on the autofluctuations of the biological activity of S.aureus 209 subcultures. Differences in the activity of the synthesis of DNAase, RNAase and delatinase could increase two-- to tenfold during the year. Relationships between heliogeophysical characteristics and the biological activity of bacteria could be both direct and reverse. The study also revealed that at the periods of increased solar and geomagnetic activity S.aureus may spontaneously dissociate in the soil, forming subcultures with greater biological activity than the initial strains.

Culture Media↗
PubMedDate not supplied

[Correlation of biophysical parameters of biologically active points and variations of heliogeophysical factors].

The correlation between the parameters of biologically active points and the dynamics of solar activity was studied. Statistically significant correlations between electroconductivity of biologically active points and solar activity indices (sunspot number, Ap-index, solar radiowave flux) were revealed. The spectral analysis of the temporal organization of biologically active points revealed a set of periods present in the dynamics of solar activity. It was concluded that bioelectric system of the human organism is a complicated multilevel time-structure, which effectively reacts to changes in heliogeophysical dynamics. The bioelectric system of biologically active points is considered to be one of general information channels of electromagnetic nature, which realize the connection of organism with environment.

Acupuncture Points↗
PubMed2002

Shuttle radiation dose measurements in the International Space Station orbits.

The International Space Station (ISS) is now a reality with the start of a permanent human presence on board. Radiation presents a serious risk to the health and safety of the astronauts, and there is a clear requirement for estimating their exposures prior to and after flights. Predictions of the dose rate at times other than solar minimum or solar maximum have not been possible, because there has been no method to calculate the trapped-particle spectrum at intermediate times. Over the last few years, a tissue-equivalent proportional counter (TEPC) has been flown at a fixed mid-deck location on board the Space Shuttle in 51.65 degrees inclination flights. These flights have provided data that cover the expected changes in the dose rates due to changes in altitude and changes in solar activity from the solar minimum to the solar maximum of the current 23rd solar cycle. Based on these data, a simple function of the solar deceleration potential has been derived that can be used to predict the galactic cosmic radiation (GCR) dose rates to within +/-10%. For altitudes to be covered by the ISS, the dose rate due to the trapped particles is found to be a power-law function, rho(-2/3), of the atmospheric density, rho. This relationship can be used to predict trapped dose rates inside these spacecraft to +/-10% throughout the solar cycle. Thus, given the shielding distribution for a location inside the Space Shuttle or inside an ISS module, this approach can be used to predict the combined GCR + trapped dose rate to better than +/-15% for quiet solar conditions.

Algorithms↗
PubMed2005

Chromosome aberration and environmental physical activity: Down syndrome and solar and cosmic ray activity, Israel, 1990-2000.

The possibility that environmental effects are associated with chromosome aberrations and various congenital pathologies has been discussed previously. Recent advances in the collection and computerization of data make studying these potential associations more feasible. The aim of this study was to investigate a possible link between the number of Down syndrome (DS) cases detected prenatally or at birth yearly in Israel over a 10-year period compared with the levels of solar and cosmic ray activity 1 year before the detection or birth of each affected child. Information about 1,108,449 births was collected for the years 1990-2000, excluding 1991, when data were unavailable. A total of 1,310 cases of DS were detected prenatally or at birth--138 in the non-Jewish community and 1,172 in the Jewish population. Solar activity indices--sunspot number and solar radio flux 2,800 MHz at 10.7 cm wavelength for 1989-1999--were compared with the number of DS cases detected. Pearson correlation coefficients (r) and their probabilities (P) were established for the percentage of DS cases in the whole population. There was a significant inverse correlation between the indices of solar activity and the number of cases of DS detected--r=-0.78, P=0.008 for sunspot number and r=-0.76, P=0.01 for solar flux. The possibility that cosmophysical factors inversely related to solar activity play a role in the pathogenesis of chromosome aberrations should be considered. We have confirmed a strong trend towards an association between the cosmic ray activity level and the incidence of DS.

Chromosome Aberrations↗
PubMed2005

Near-transyear in solar magnetism.

Daily data on solar magnetism, available from May 1975 to April 2002, were analyzed by linear-nonlinear rhythmometry, with particular focus on the near-transyear, slightly longer than the calendar year. The time structure of solar magnetism is compared to that of solar activity, gauged by Wolf numbers. An about 27-day component corresponding to the solar rotation period, is common to both variables but differs in harmonic content. About 10-year component characterizes solar activity but not solar magnetism. A near-transyear with a period of about 1.05 years is detected in solar magnetism. In solar activity, a near-transyear is also found but its period of about 1.10 years is longer than that characterizing solar magnetism, and it may be paired with an about 0.9-year component to correspond to an about 10-year modulation in amplitude or phase of an about-yearly component.

Electromagnetic Fields↗
PubMedDate not supplied

Seasonal distribution of relapse onset in rheumatoid arthritis and spondyloarthropathy: the possible effect of the solar factor.

BACKGROUND AND OBJECTIVE: The seasonal effect on the relapse of rheumatoid arthritis and spondyloarthropathies is still unclear. To assess the seasonal distribution of relapse onset in rheumatoid arthritis (RA) and spondyloarthropathy (SpA) and its association with solar factors. METHODS: The monthly distribution of relapse onsets during the years 1998-2000 was retrospectively chart reviewed in 364 patients. In 1998 a total of 131 patients were studied; 60 with seropositive (sp) RA, 30 with seronegative (sn) RA and 41 with SpA; 113 patients in 1999: 44 with spRA, 38 with snRA and 31 with SpA; 120 patients in 2000: 56 with spRA, 38 with snRA and 26 with SpA. All of them were treated in the Department of Rheumatology, which serves the population of northwestern Israel. Solar activity was analyzed according to the "Solar Terrestrial Activity Report Charts 1998-2000". The Central Israel Bureau of Statistics provided the sun global radiation data. Data was assessed during the summer (April-September) and winter (January-March, October-December). The correlation between the monthly distribution of disease relapses and solar factors was measured (SPSS-10 for WIN). RESULTS: Relapses in spRA patients occurred mostly during the summer months with peak activity during the month of July 2000. Single monthly peaks of spRA relapse onset were noted in January 1998-1999 and April 1998 and for snRA in January 1998 and June 2000, but there were no seasonal differences for spRA, snRA and SpA in 1998-1999 and for snRA and SpA in 2000. Relapses in spRA patients were associated with a summer bias of increased solar activity and global solar radiation in 2000 compared with lower peak solar activity in 1998-1999. Furthermore, in 2000 we found a significant correlation of the spRA monthly relapse count to solar activity (p = 0.005) and global sun radiation (p = 0.048) unlike snRA and SpA. No above-mentioned association and correlation was noted in 1998-1999. We revealed mild negative correlation (p = 0.046) of SpA relapse count only to peak solar flux (PSF) by analysis of data for 1998-2000 as one united group. CONCLUSIONS: Relapses were more frequent during the summer of 2000 (May-June-July) in spRA but not in snRA and SpA. The reasons are still unclear. No seasonal differences were observed in 1998-1999. Enhanced solar activity in summer-2000 compared with 1998-1999 may be inferred to be the proposed cause but coincidence may occur as well. Outbreak in RA and SpA was not registered despite increased peak solar activity in 2000. We observed mild evidence of reciprocal relation between SpA relapsing and solar activity during 1998-2000. Solar and any other possible contributory factors remain still to be elucidated.

Arthritis, Rheumatoid↗
PubMed2004

Variations of the gravitational field as a motive power for rhythmics of biochemical processes.

Variations of the gravitational field affected by the Sun and the Moon while the Earth's moving along the orbit seem to be a powerful source of many rhythmical processes typical of biochemical processes. Studies carried out in AARI revealed the obvious relationships between the dynamics of some biochemical reactions and lambda(D)-function describing the regular variations of the gravitational field under combined influence of the Sun and the Moon. The following of them are examined as examples: the rate of the unithiol oxidation in vitro, concentration of the thiol compounds in human urine, some hematological indicators (rate of the erythrocytes sedimentation, hemoglobin content). Compatibility of run of the biochemical indicators and lambda(D)-function is indicative of essential influence of the regular variations of the gravitational field on rhythmics of the biochemical processes. As this takes place, the solar activity acts like to the instability factor. Balance of the solar activity effects and the varying gravitational field effect alter in time depending on location in the solar activity cycle.

Blood Sedimentation↗
PubMed2003

Chronomics of tree rings for chronoastrobiology and beyond.

Gliding spectral windows illustrate the changes as a function of time in the relative prominence of signals in a given frequency range, viewed in 3D or as surface charts. As an example, the method is applied to a 2,189-year series of averages of ring measurements on 11 sequoia trees published by Douglass. Analyses of the original data and after filtering reveal, among others, components with periods of about 10.5 and 21 years similar to the Schwabe and Hale solar activity cycles. An alignment of gliding spectra with a global spectrum serves to define, by minima, the ranges of variability around the anticipated Schwabe and Hale cycles. This procedure may have more general applicability when dealing with ranges of only transiently synchronized, wobbly, and perhaps sometimes free-running periodicities. Solar activity is known to affect climate and changes in climate are reflected to some extent in tree growth. The spectral structure in tree rings could serve not only to check any relations of climate with sunspots, auroras and more modern measures of solar activity, but also to check any purely mathematical extrapolations from the much shorter available actual data on solar activity. With such extrapolated series and the data analyzed herein, the task remains to align physical and physiological variables to further study the influence of natural environmental factors near and far on biota, including international battles, which cover an even longer span of 2,556 years.

Chronobiology Phenomena↗
PubMed2003

Temporal distribution of death among oncology patients: environmental links.

BACKGROUND: The natural history of terminal oncologic disease is death from cardiopulmonary arrest. The goal of this study was to determine whether the temporal distribution of death among oncology patients is related to levels of environmental physical activity-solar, geomagnetic, and cosmic rays and high energy space proton flux, as previously shown for other situations like accidents, suicide, and the occurrence of acute myocardial infarction. EXPERIMENTAL: Deaths of oncology patients, n = 102604, in 168 consecutive months were compared with-monthly indices of solar, geomagnetic, cosmic rays activity (sunspot number, solar flux, Ap, Cp, Am), and indices of magnetic and cosmic rays activity according to neutron monitor data). In addition, oncology patients monthly death numbers were compared with numbers of deaths from ischemic heart disease (IHD), stroke, sudden cardiac death (SCD), accidents, road accidents, non cardiovascular death (total deaths - [IHD + stroke]). The National Data of the Republic of Lithuania was used, excluding SCD and myocardial infarction in Kaunas--the second largest city in Lithuania Monica study register was used for SCD at age 25-64, and all data of AMI. Pearson correlation coefficients and their probabilities were obtained between the numbers of oncology patient monthly deaths and (1) cosmo-physical indices and (2) the number of deaths from other causes and the occurrence of AMI. RESULTS: The number of oncology patient deaths was inversely correlated with solar and geomagnetic activity indices and positively correlated with cosmic rays activity. The number of oncology patient deaths was correlated with monthly number of deaths from non-cardiovascular courses, stroke, suicide, at trend level with SCD, but not with deaths from IHD, accidents, road accidents. Oncology patient deaths showed a significant correlation with the number of AMI. CONCLUSION: The monthly death number of oncology patients is significantly related with environmental physical activity and shows similarity with deaths distribution by time of some other groups of death--stroke, SCD, suicide, and occurrence of AMI. The inverse correlation with solar and geomagnetic activity and positive links with cosmic rays activity level are remarkable.

Accidents↗
PubMedDate not supplied

[The multiyear changes in the epidemic activity of the foci of zoonotic cutaneous leishmaniasis at the Murgab oasis. I. An analysis of the relations of morbidity to heliogeophysical factors].

Attempts were made to analyse the relationships of changes in the pattern of zoonotic cutaneous leishmaniasis (ZCL) morbidity by the 1951-1993 statistics of the Turkmenistan Ministry of Health by the areas of Maryĭskiĭ velaiat with heliogeophysical factors. For quantitative characterization of solar activity changes, various indices were used; among them there was the Wolf number, radio radiation flux at a wavelength of 10.7 cm. and the geomagnetic Aa-index. In some many-year observations, vague cyclic variations were detected on a personal computer by spectral and periodogram analyses proved to be effective in other diseases. Correlation and cross-correlation analyses were used to evaluate the possible relationships between the morbidity rates and the changes in heliogeophysical factors. The study has revealed that the epidemic activity of ZCL foci is characterized by cyclicity with variations of about 2.4, 3.6, 6.9, and 11.2 years. The changes in ZCL morbidity in the areas, including the natural ZCL foci of Murgab delta landscapes, slightly differ from those in the areas with valley foci in the south part of the velayat in the duration and expression of cycles. At the same time sun-caused 11-year cycles are observed in all groups of the areas, though they are slightly more pronounced in the north than in the south. The greatest epidemic outbreaks (1956-1957, 1965, 1977, and 1986-1988) occurred in various areas of the Murgab oasis on an average of 1-3 years after the minimum of 11-year solar cycles. Noteworthy, they are greatly marked in odd solar activity cycles (the 1957 and 1977 outbreaks) in many areas. Among the parameters chosen, the radio flux of solar radiation at a wavelenght of 10.7 cm and the Wolf number (the correlation coefficients are as high as 0.30-0.50 at P = 0.95) are closely related with ZCL morbidity changes when the plot is shifted. At the same time the values of the geomagnetic Aa-index are unlikely to greatly affect changes in the epidemiological situation. The regularities revealed are of particular significance for long-term prediction of the greatest rises of ZCL morbidity rates. Taking into account the estimated solar activity changes within the next years, one may expect activation of natural ZCL foci and, in case of untimely use of prophylactic measures, the following rise in the population's morbidity in 1998-1999.

Disease Outbreaks↗
PubMed2002

Activities of the Japanese space weather forecast center at Communications Research Laboratory.

The International Space Environment Service (ISES) is an international organization for space weather forecasts and belongs to the International Union of Radio Science (URSI). There are eleven ISES forecast centers in the world, and Communications Research Laboratory (CRL) runs the Japanese one. We make forecasts on the space environment and deliver them over the phones and through the Internet. Our forecasts could be useful for human activities in space. Currently solar activity is near maximum phase of the solar cycle 23. We report the several large disturbances of space environment occurred in 2001, during which low-latitude auroras were observed several times in Japan.

Extraterrestrial Environment↗
PubMedDate not supplied

[Variations in the intensity of solar neutrinos as a problem for physical chemistry].

A comparison of variations in the solar neutrino flux in Brookhaven measurements with solar activity indices clearly shows that the neutrino flux is controlled by surface solar processes. These processes can lead to changes in the efficiency of registrations of the neutrino flux. From this view point, the results of the measurements of the neutrino flux on the Brookhaven detector in 1970-1994 (108 runs) were analyzed. It was found that the neutrino flux depends on the heliogeophysical situation. The well known anticorrelation between the neutrino flux and Wolf numbers is observed only for odd cycle of solar activity. A similar regularity occurs for critical frequencies of E-ionosphere. By contrast, the correlation between the neutrino flux and the Ap-index is observed only for the even activity cycle. The predominance of the sign of radial component of the interplanetary magnetic field in the last 7-14 days of exposure has the greatest effect on the neutrino flux (this sign changes as the sign of the total magnetic field of the Sun changes). In short runs, the neutrino flux changes more than threefold. The conclusion is made that variations of the solar neutrino flux are falcious. These fictitious variations are caused probably by the action of very low-frequency electromagnetic emissions of the magnetosphere upon the substance of the target and the technology of the extraction of 37Ar atoms from perchloretylene.

Argon↗
PubMed1998

[Dependence of human EEG spatial synchronization on the geomagnetic activity on the day of experiment].

Spontaneous EEG was registered under different activity conditions in 26 volunteers. The EEG synchronisation parameters were compared with the geomagnetic and solar activity on the day of experiment. A positive correlation of the EEG data with the geomagnetic activity was revealed, being most obvious in the frontal and central areas. A negative correlation between some local EEG synchronisation parameters and different indices of the solar activity, was also revealed. The degree of synchronisation of the spontaneous EEG seems to reflect sensitivity of the human nervous system to the Earth's magnetic field. A stressor response to strong short-term disturbances in the geomagnetic field reveals itself in the form of enhancement of the EEG global synchronisation. A sedative effect of slow magnetic oscillations is locally revealed in the parameters of the EEG synchronisation within the left hemisphere as well as the interhemisphere synchronisation.

Adolescent↗
PubMed2004

Measurement of the total active 8B solar neutrino flux at the Sudbury Neutrino Observatory with enhanced neutral current sensitivity.

The Sudbury Neutrino Observatory has precisely determined the total active (nu(x)) 8B solar neutrino flux without assumptions about the energy dependence of the nu(e) survival probability. The measurements were made with dissolved NaCl in heavy water to enhance the sensitivity and signature for neutral-current interactions. The flux is found to be 5.21 +/- 0.27(stat)+/-0.38(syst) x 10(6) cm(-2) s(-1), in agreement with previous measurements and standard solar models. A global analysis of these and other solar and reactor neutrino results yields Deltam(2)=7.1(+1.2)(-0.6) x 10(-5) eV(2) and theta=32.5(+2.4)(-2.3) degrees. Maximal mixing is rejected at the equivalent of 5.4 standard deviations.

Journal Article↗
PubMed1998

Variations of the radiation dose onboard Mir station.

Dose variations, associated with the 11-year solar activity cycle, seasonal variations of particle fluxes in the Earth's radiation belts at the station orbit, and solar proton events are studied, using prolonged measurements of radiation doses inside orbital station Mir. Daily averages of radiation doses during the declining phase of the 22nd solar cycle and during transition to the 23rd solar activity cycle reached very large values for astronauts and significantly exceed the values calculated according to existing models.

Cosmic Radiation↗