Results 151 to 160 of about 2,148 (181)
Some of the next articles are maybe not open access.
Prominences and the Green Corona Over the Solar Activity Cycle
Solar Physics, 1998Prominences, in contrast to other solar activity features, may appear at all heliographic latitudes. The position of zones where prominences are mainly concentrated depends on the cycle phase of solar activity. It is shown, for prominence observations made at Lomnický Stit over the period 1967–1996, how the position of prominence zones changes over a ...
M. Minarovjech, M. Rybanský, V. Rušin
openaire +1 more source
Confined pseudo-shocks as an energy source for the active solar corona
Nature Astronomy, 2018The Sun’s active corona requires an energy flux of ~103 W m−2 to compensate for radiative losses and to maintain its high temperature1. Plasma moves in the corona through magnetic loops2,3, which may be connected with the flows in and around sunspots4–6.
Teimuraz Zaqarashvili +2 more
exaly +2 more sources
Comprehensive studies of solar activity on the CORONAS-F satellite
Astronomy Letters, 2002The first results of comprehensive CORONAS-F observations of solar activity are presented. The CORONAS-F instrumentation and principal scientific objectives are briefly described and examples of the first results of data reduction are given.
V. N. Oraevsky, I. I. Sobelman
openaire +1 more source
Solar System Research, 2008
The CORONAS-I and CORONAS-F data on variations in the ionizing shortwave ultraviolet (UV) solar radiation (EUV radiation) at wavelengths of less than 130 nm and near the H Lyman-alpha line are presented. The CORONAS-I data refer to the period close to solar minimum (the index F 10.7 = 80−100), and the CORONAS-F measurements were
T. V. Kazachevskaya +3 more
openaire +1 more source
The CORONAS-I and CORONAS-F data on variations in the ionizing shortwave ultraviolet (UV) solar radiation (EUV radiation) at wavelengths of less than 130 nm and near the H Lyman-alpha line are presented. The CORONAS-I data refer to the period close to solar minimum (the index F 10.7 = 80−100), and the CORONAS-F measurements were
T. V. Kazachevskaya +3 more
openaire +1 more source
Astrophysical Journal, 1961 The outer solar corona during the declining portion of the solar activity cycle
Planetary and Space Science, 1966Abstract Some hitherto unpublished observations of the coronal radio scattering made in Sydney during 1962 are combined with observations made at various observatories in the two year interval 1960–1962 to deduce the dependence of scattering on solar activity in the range of angular separations 20–80 R⊙.
openaire +1 more source
Quiet corona density model for the last maximum of solar activity
Solar Physics, 1973We have selected observations of quiet K corona in maximum activity phase (1970 and 1972) and we have computed the corresponding density models. The density is found to be two times smaller than in average maximum coronal models (Newkirk, 1967) and nearly equal to that of minimum coronas (Saito, 1970).
Y. Leblanc, J. L. Leroy, P. Pecantet
openaire +1 more source
On a relation between the indices of solar activity in the photosphere and the corona
Solar Physics, 1969In the first part a new index of solar activity in the photosphere is introduced i.e. the areas index Ia defined with the help of the relation, where A and f are the total areas of the sunspots and faculae respectively corrected for foreshortening.
openaire +1 more source
Geomagnetism and Aeronomy, 2006
In 2001–2003, 45 flares of hard X ray (HXR) and gamma ray radiation, identified with a particular active region (AR) that produced each event, were recorded during the experiments onboard the Russian Solar Observatory CORONAS-F using the SONG (solar neutrons and gamma ray quanta) instrument.
B. V. Agalakov +8 more
openaire +1 more source
In 2001–2003, 45 flares of hard X ray (HXR) and gamma ray radiation, identified with a particular active region (AR) that produced each event, were recorded during the experiments onboard the Russian Solar Observatory CORONAS-F using the SONG (solar neutrons and gamma ray quanta) instrument.
B. V. Agalakov +8 more
openaire +1 more source
Radio astronomical studies of solar activity and its effects on the Solar Corona and the heliosphere
Advances in Space Research, 1995Abstract The radio astronomical studies of solar activity are powerful complementary tools to the studies in the other parts of the electromagnetic spectrum and of the corpuscular emissions. We can either observe the Solar radio emission directly or resort to the occultation techniques.
openaire +1 more source