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Start Over Subject solar activity

2. Flares activity during solar cycle 21

Creator:
Dinulescu, Simona and Dinulescu, Vasil
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
solar flares and solar activity
Language:
Czech
Description:
The present paper investigates the statistical behaviour of the solar flares through cycle 21 (1976-1986). The total number of solar flares and the number of flares of various importance are given. The year of maximum of all events was 1980 with 10132 flares. The subflares háve had their maximum values in 1979 (9278 events) and in 1980 (9273 events) while, the other flares reached the maximum two - three years later. The asymmetry A for subflares and importance 1 flares favour the Southern hemisphere (A= -2.8 and -0.9) but thal of importance >2, the northem hemisphere (A= +3.6). The maximum number of flares with importance >2 (Fmax) in solar cycle 21 took place two years later than the maximum number of solar spots (Rmax) but Fmax in cycle 20 appeared one year before Rmax and for cycle 19 in the same year of Rmax.
Rights:
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3. Jak sluneční aktivita ovlivňuje zemi a prostředí pro lidskou populaci

Creator:
Podolská, Kateřina
Format:
print, bez média, and svazek
Type:
article, články, model:article, and TEXT
Subject:
Demografie. Populace, sluneční aktivita, obyvatelstvo, klimatologie, solar activity, population, climatology, solar cycles, historical climatology, climate impacts, geomagnetic storm, 18, and 314
Language:
Czech
Description:
Solar activity has important effect on terrestrial environment in which human population lives. Long-term and short-term periodicities in solar activity had influence on secular climate changes, little ice ages and climatic optima. The article summarizes briefly the results and methods of historical climatology. The text resumes the methods of research of the solar activity variation over the last 1500 years, through physical methods as well as through preserved written sources. The basic mechanisms of the effects of solar activity on terrestrial environment and human population are explained as well as the predictions of the upcoming solar activity. This may indicate that we are currently at the beginning of another long-term solar minimum., Kateřina Podolská., and Obsahuje bibliografii
Rights:
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4. Solar activity, aurorae and climate in Central Europe in the last 1000 years

Creator:
Křivský, L. and Pejml, K.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
solar activity, auroral observations, and fluctuation of the climate
Language:
Czech
Description:
The authors have attempted to elucidate a problem which has widely been discussed in recent years, i. e. the ftuctuation of the solar activity in the past centuries, i. e. from the year 1 000 to the end of the I9th century; for this purpose, they have used a catalogue of auroral observations compiled from all the catalogues (or their corrections) hitherto published, sets of observations and their own supplement of hitherto uncatalogized or unknown observations of the aurorae, extracted from the most various historical sources found in the Czech Lands. The supplement contains 91 aurorae from Bohemia and is presented in Part I. This catalogue gives the ordinal number of the aurora, the date, the description in the original language and the English translation. The world catalogue and its elaboration which regard to long-term variations of aurorae is in Part II, and contains 3 878 northern aurorae from latitudes < 55°N. Part III deals with the relation between the fluctuations of the secular solar activity, in terms of occurrence of aurorae, and the fluctuations of the climate, with particular regard to Central Europe and Bohemia. and Článek převzat z Travaux Géophysiques XXXIII (1985), s. 79-151
Rights:
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5. Solar excitation of bicentenni al earth rotation oscillations

Creator:
Cyril Ron, Chapanov, Yavor, and Jan Vondrák
Format:
print, bez média, and svazek
Type:
article, články, model:article, and TEXT
Subject:
Geologie. Meteorologie. Klimatologie, zemská rotace, sluneční aktivita, Earth rotation, solar activity, 7, and 551
Language:
English
Description:
The bicentennial varia tions of the Earth rotation consist of several oscill ations with most known periods 178.7a (Jose cycle), 210a and 230a (de Vries cycle); they are driven by the solar cycles which affect climatic variations, followed by global environmental changes. These periods are close to the higher harmonics of millennial Hallstatt cycle (2300a), so the proper separation between the indi vidual bicentennial cycles needs time series longer than 2300a. The bicentennial variations of the Universal Time (UT1) in relation to the Terrestrial Time (TT) are investigated using reconstructed time series of the Total Solar Irradiance (TSI) for the last 9300a. A linear regression model of TSI influe nce on the UT1 and the Mean Sea Level (MSL) bicentennial variations are created. The parameters and time series of the bicentennial UT1-TT oscillations for the last 9300a are determined., Cyril Ron, Yavor Chapanov and Jan Vondrák., and Obsahuje bibliografické odkazy
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

8. The long-range variability of annual precipitation in Prague - Klementinum in the period 1805-1951 and in relation to the solar activity

Creator:
Křivský, Ladislav
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
astrophysics and solar activity
Language:
Czech
Description:
The condition of measurement of precipitation from the year 1805 up-to the present time are defined. On the vasis of an analysis of the conditions and by comparison with the neighbouring stations a whole series of annual percipitation is homogenized. The original values in the period 1805-1830 are reduced for 8.7 %, the period 1840-1905 zemains unchanged, the period 1906-1951 is reduced partly for 10 % (Hlaváč), partly for 15 %. For the statement of long-range variability of the annual precipitation the method of double-time integral of precipitation deviations was used. The curves thus gained show a long-range variation having a contraty course regarding the secular curve of solat activity (90-year-rhythm). The long-range relation of the variability of annual precipitation to the secular solar activity is expounded by the change of circulation (showing the width of the frontal zone). Further a close connection between the course of yearly precipitaton nd Ejgenson´s Index of Recurrency of Sunspots was found, which is evidently applicable for Central-Europe. Immediately after the maximum of Recurrency Index there is a characteristic decrease of precititation, closely following the minimum of Recurrency Index there is remarkable rise. On the ground of extrapolation of the acquired secular curves of precipitation and on the ground of physically justified correlation with long-range solar activity, a prognosis of the course of the annual precipitation up to the year 2000 is defined. At present the long-range course of precipitaton shows the minimum, in the years 1970-1990 the precipitation should reach the secular maximum.
Rights:
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9. The variation of the frontal zone during the year in the area of the Atlantic and Europe and in relation to the solar activity

Creator:
Gregor, .Z. and Křivský, L.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
astrophysics and solar activity
Language:
Czech
Description:
I. The mean state of circulation in some of the months can be demonstrated by the mean position of the frontal zone. From the position of the frontal zone we can determine if the zonal or meridional circulation prevails, and in which way it will change during the year II. The long-range variation of the mean frontal zone in relation to solar activity expressed by Ejgenson s Index of Recurrency of Sunspots A is determined. The effect ascertained is especially significant in January. The results in maps show the deviations of frequencies of the zones from the mean state, partly in the years of minima, partly in the years of maxima of the recurrency of sunspots.
Rights:
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10. Velocity field and some aspects of solar activity

Creator:
Gopasyuk, S. I.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
solar activity, velocity fields, and plasma motions
Language:
Czech
Description:
Some general characteristics of the observed plasma motions in the actlve region are described. The data concerning the birth and evolution of sunspots, intrinaic internal motiona, the balance of plasma fluxes in individual sunspots and in the active region as a whole are presented. Special attention is paid to rotational plasma motion in sunspots and torsional oscillations of the spots. The. importance of data on torsional oscillations of aunspots has been established for the study of the magnetic field structure and plasma convection in subphotospheric layers of the Sun.
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public