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Results for “Solar Activity”

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At least 19 recordsLinked to original sources
PubMed1993

Intraocular pressure (IOP) in relation to four levels of daily geomagnetic and extreme yearly solar activity.

The link between geomagnetic field activity (GMA), solar activity and intraocular pressure (IOP) in healthy individuals was investigated. The IOP of 485 patients (970 eyes) was recorded over three nonconsecutive years (1979, 1986, 1989) which were characterized by maximal solar activity (1979, 1989) or minimal solar activity (1986). The measurements were also correlated with four categories of GMA activity: quiet (level I0), unsettled (II0), active (III0), and stormy (IV0). Participants were also differentiated by age and sex. We found that IOP was lowest on days of level IV0 (stromy) GMA. The drop in IOP concomitant with a decrease in GMA level was more significant during periods of low solar activity and in persons over 65 years of age. There was a trend towards higher IOP values on days of levels II0 and IV0 GMA in years of high solar activity. Differences between the sexes and among individuals younger than 65 years were not significant. Our results show an interesting aspect of environmental influence on the healthy population.

Adult↗
PubMedDate not supplied

[Affective disorders and solar activity].

INTRODUCTION: The present work discusses the link between solar activity and appearance of affective disorders. Solar activity is reflected by the Wolf number, which is given by the formula R = K (10 g + f), where g corresponds to the groups of sunspots and f is the total number of sunspots. METHODS: We examined 1,212 clinical files at the Clínica Psiquiátrica Universitaria, Santiago de Chile. Patients with major depressions and manic disorders, who were admitted to the clinic for the first time and had no previous treatment were considered. We examined the correlation between annual incidence of hospitalization and average Wolf numbers for those years, included in the period 1990-2000, which corresponds to a complete solar cycle of 11 years. RESULTS: An important number of hospitalizations of depressive patients occurred during years of low solar activity, and there was a slight increase in the number of manic patients during years of high solar activity. Depressive disorders showed a negative correlation with solar activity, the Pearson coefficient being equal to -0.72. Manic disorders showed a positive correlation, with coefficient equal to +0.334. CONCLUSIONS: Depressive disorders have an inverse correlation with solar activity, while manic disorders have a positive correlation.

Adolescent↗
PubMed1995

Solar activity cycle and the incidence of foetal chromosome abnormalities detected at prenatal diagnosis.

We studied 2001 foetuses during the period of minimal solar activity of solar cycle 21 and 2265 foetuses during the period of maximal solar activity of solar cycle 22, in all women aged 37 years and over who underwent free prenatal diagnosis in four hospitals in the greater Tel Aviv area. There were no significant differences in the total incidence of chromosomal abnormalities or of trisomy between the two periods (2.15% and 1.8% versus 2.34% and 2.12%, respectively). However, the trend of excessive incidence of chromosomal abnormalities in the period of maximal solar activity suggests that a prospective study in a large population would be required to rule out any possible effect of extreme solar activity.

Adult↗
PubMed1996

Resonance of about-weekly human heart rate rhythm with solar activity change.

In several human adults, certain solar activity rhythms may influence an about 7-day rhythm in heart rate. When no about-weekly feature was found in the rate of change in sunspot area, a measure of solar activity, the double amplitude of a circadian heart rate rhythm, approximated by the fit of a 7-day cosine curve, was lower, as was heart rate corresponds to about-weekly features in solar activity and/or relates to a sunspot cycle.

Adult↗
PubMedDate not supplied

[The origin of the biological week from data on the rhythm of cardiac contractions in people during the solar activity cycle].

A human biologic week in the heart rate variations was compared with the variations of the sunspot area and geomagnetic activity over the solar cycle. The low ratio of amplitude of circaseptan rhythm to that of circadian rhythm in the heart rate of several clinically healthy men who did around-the-clock self-measurements in a number of years coincides with the period of anomalously low amplitude of circaseptan rhythm of the solar activity. Results herein suggest that physiologic circaseptan rhythms are built into the genome being adapted evolutionary to the original heliogeomagnetic environmental circaseptans.

Adaptation, Physiological↗
PubMed1995

Relationship between immunoglobulin levels and extremes of solar activity.

The possible relationship between epidemics and extremes of solar activity has been discussed previously. The purpose of the present study was to verify whether differences in the levels of immunoglobulins (IgA, IgG, IgM) could be noted at the highest (July 1989) and lowest (September 1986) points of the last (21st) and present (22nd) 11-year solar cycle. The work was divided into a 1-month study (covering the month of minimal or maximal solar activity), a 3-month study (1 month before and after the month of minimal or maximal solar activity) and a 5-month study (2 months before and after the month of minimal or maximal solar activity). A trend of a drop-off for all three immunoglobulins was seen on the far side of the maximal point of the solar cycle. Statistical significance was achieved in the 5-month study for IgM (P = 0.04), and a strong trend was shown for IgG (P = 0.07). Differences between the sexes were also noted.

Female↗
PubMed2004

[Advancements of the studies on the relationships between air temperature and solar activity with diseases].

Varieties of air temperature and solar activity have a close correlation with human health. The megatemperature mainly results in the increased incidence of cerebrovascular disorder (CVD). It is related to the regulatory mechanism of homeothermism. In the hypothermy environment, obvious increment of human's blood viscosity was observed, which may induce the cerebral infarction, myocardial infarct or coronary heart disease. Not only have solar activities a close relationship with the incidences of plague and epidemic cerebrospinal meningitis, but also high correlation with onco-genesis and infant natality and mortality. UV-A and UV-B may cause skin destructions. The measures and further study on lessening hazards of climate change were discussed in this article.

Disease↗
PubMedDate not supplied

[Correlation of the solar activity with water electrical conductivity].

A correlation between the solar activity (Wolf numbers) and electric conductivity of water was found. It was suggested that changes in the electric conductivity of water are the primary cause of the known correlations between the solar activity and various processes in the biosphere.

Electric Conductivity↗
PubMed1990

[Solar activity and venereal disease morbidity].

Analysis of the solar activity and incidence of sexually-transmitted diseases over the period of 1954 through 1987 has revealed that development of fading of an epidemic process in sexually-transmitted diseases does not depend on enhancement or weakening of solar activity. These values much differ in respect of many parameters in various years, there is no correlation as regards the length of the periods between the minimal and maximal values or over these periods in various years. The morbidity rates are in inverse correlation with the activity of therapeutic and prophylactic institutions in detecting the patients during all types of prophylactic check-ups.

Cosmic Radiation↗
PubMed1994

Radiation environment due to galactic and solar cosmic rays during manned mission to Mars in the periods between maximum and minimum solar activity cycles.

A possibility of a manned mission to Mars without exceeding the current radiation standards is very doubtful during the periods of minimum solar activity since the dose equivalent due to galactic cosmic rays exceeds currently recommended standards even inside a radiation shelter with an equivalent of 30 g cm-2 aluminum. The radiation situation at the time of maximum solar activity is determined by the occurrence of major solar proton events which are exceedingly difficult to forecast. This paper discusses the radiation environment during a manned mission to Mars in the years between minimum and maximum solar activity when the galactic cosmic ray intensity is considerably reduced, but the solar flare activity has not yet maximized.

Cosmic Radiation↗
PubMedDate not supplied

[Solar activity, dynamics of the ozone layer and possible role of ultraviolet radiation in heliobiology].

Solar activity influences the ozonosphere thickness, thus changing the intensity of the near-Earth ultraviolet radiation in the B band. In certain regions the radiation may change by 10--15%, with solar activity varying from its maximum to minimum. The variations in the ultraviolet intensity are very likely to be environmentally important. Thus, solar ultraviolet radiation at lambda = 290 -- 340 nm acts as one more physical agent transferring the effect of solar activity into the biosphere.

Atmosphere↗
PubMed1983

Solar activity and myocardial infarction.

The correlation between the incidence of myocardial infarction, sudden cardiac death, the solar activity and geomagnetism in the period 1969-1976 was studied, basing on Wrocław hospitals material registered according to WHO standards; sudden death was assumed when a person died within 24 hours after the onset of the disease. The highest number of infarctions and sudden deaths was detected for 1975, which coincided with the lowest solar activity, and the lowest one for the years 1969-1970 coinciding with the highest solar activity. Such an inverse, statistically significant correlation was not found to exist between the studied biological phenomena and geomagnetism.

Adult↗
PubMed2005

Climate: how unusual is today's solar activity?

To put global warming into context requires knowledge about past changes in solar activity and the role of the Sun in climate change. Solanki et al. propose that solar activity during recent decades was exceptionally high compared with that over the preceding 8,000 years. However, our extended analysis of the radiocarbon record reveals several periods during past centuries in which the strength of the magnetic field in the solar wind was similar to, or even higher than, that of today.

Atmosphere↗
PubMed1995

[Variations of solar activity and radiation situation on board MIR station during the period 1986-1994].

This paper is dedicated to the analysis of the radiation situation onboard Mir station over a period of 1986-1994, there examined the main cosmophysics parameters and indices of the solar activity as well as the variations of the parameters of the earth's magnetic field and their association with the changes in the power of absorbed dose onboard the station. There noted the high levels of radiation exposure to the cosmonauts under terrestrial conditions when carrying out the roentgeno-radiologic examinations and procedures comparable or exceeding the absorbed doses during the flights. For revealing the regular associations of the radiation situation onboard the station with the parameters of solar activity there has been analyzed the time changes of average monthly values of dose power since the beginning of station functioning in 1986 until returning the fifteenth expedition to Earth. From the analyses of the results it might be assumed that the best statistical associations of average monthly power of the absorbed dose are found with the streams of protons of GCR. Wolff numbers and background stream of the radio emission of the Sun which reflects the existence of the radiation situation upon the phase of solar activity cycle. From this paper it transpires that calculating the dose loads during the period of the extreme phases of solar activity, it is possible to make between them the interpolations of time dependence by analogy with the dynamics in time of the background streams of GCR or Wolff numbers.

Data Interpretation, Statistical↗
PubMed1988

[Phase coordination of the rhythms of changes in solar activity and of the monthly biorhythms of altered cholesterol levels of the blood serum in rabbits].

The concentration of total, free and bound cholesterol in the blood serum of 13 intact Chinchilla male rabbits was determined in two four-month experiments carried out in 1973-1974 and in 1984-1985 during a "minimum" phase of an 11-year solar activity cycle. A hierarchy of ten cholesterol biorhythms and solar activity rhythms were singled out on a computer, using an original algorithm, in the individual changes in cholesterol concentration in each rabbit and in changes in seven environmental indexes. A statistical stability of the frequency and phase of low-frequency cholesterol biorhythms and solar activity rhythms has been established within an 11-year period, the fluctuation amplitude of the indexes studied being, on the contrary, statistically unstable.

Animals↗