Changed Relation between Solar 10.7-cm Radio Flux and some Activity Indices which describe the Radiation at Different Altitudes of Atmosphere during Cycles 21–23     

E. A. Bruevich  V. V. Bruevich  G. V. Yakunina 《Journal of Astrophysics and Astronomy》2014,35(1):1-15

The correlation coefficients of the linear regression of six solar indices versus 10.7 cm radio flux F _10.7 were analysed in solar cycles 21, 22 and 23. We also analysed the interconnection between these indices and F _10.7 with help of approximation by polynomials of second order. The indices we have studied in this paper are: the relative sunspot numbers – SSN, 530.3 nm coronal line flux – F ₅₃₀, the total solar irradiance – TSI, Mg II 280 nm core-to-wing ratio UV-index, the Flare Index – FI and the counts of flares. In most cases the regressions of these solar indices vs. F _10.7 are close to the linear regression except the moments of time near the minimums and maximums of the 11-year activity. For the linear regressions, we found that correlation coefficients K _corr(t) for the solar indices vs. F _10.7 and SSN dropped to their minimum values twice during each 11-year cycle.  相似文献   

Corrigenda     

A. B. Delone  E. A. Makarova  G. V. Yakunina 《Journal of Astrophysics and Astronomy》1988,9(2):125-125

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Solar Flares in Extreme Ultraviolet and X-Ray Bands Based on SDO and TIMED Satellite Data     

Yakunina  G. V.  Bruevich  E. A. 《Geomagnetism and Aeronomy》2021,61(8):1122-1127

Geomagnetism and Aeronomy - Fluxes in flares are studied in soft X-ray (SXR) and extreme ultraviolet (EUV) bands based on data from GOES, the Solar Dynamics Observatory (SDO), and the Thermosphere,...  相似文献   

Destabilization, interaction, and eruption of filaments on the sun and associated phenomena     

G. A. Porfir’eva  G. V. Yakunina 《Geomagnetism and Aeronomy》2013,53(8):977-980

A brief overview of the observation results of filament interactions on the Sun both from the Earth and from space at the TRACE, SOHO, STEREO, Hinode, and Yohkoh stations in white light, Hα, extreme UV (EUV), X rays, and a radio range is presented. Various filament collision cases, where filaments merge (or do not merge) or change their forms as a result of reconnection, are considered. Filament interactions are associated with flares, filament eruptions, and coronal mass ejections. The theoretical aspects of the observed phenomena are also considered.  相似文献   

Flux Variations in Lines of Solar EUV Radiation beyond Flares in Cycle 24     

Bruevich  E. A.  Yakunina  G. V. 《Geomagnetism and Aeronomy》2019,59(2):155-161

Geomagnetism and Aeronomy - Studies in the extreme ultraviolet (EUV) and X-ray ranges of the solar spectrum are important due to the active role of radiation of these ranges in the formation of the...  相似文献   

24th Cycle of Solar Activity: Geoefficiency of Flares     

Bruevich  E. A.  Yakunina  G. V. 《Geomagnetism and Aeronomy》2020,60(7):876-880

Geomagnetism and Aeronomy - Various aspects of the of geoefficiency of solar-activity phenomena, such as flares and coronal mass ejections (CMEs), are considered. The number of geoefficient events...  相似文献   

Large Flares (M1–X7) in Solar Activity Cycle 24     

Bruevich  E. A.  Kazachevskaya  T. V.  Yakunina  G. V. 《Geomagnetism and Aeronomy》2017,57(8):1077-1085

Geomagnetism and Aeronomy - The large (X-ray class > M1) and very large (X-ray class > X1) flares (according to the observations of GOES-15 and Preliminary data from Current Catalog...  相似文献   

The number of sodium atoms in the region of circumsolar sublimation of interplanetary dust     

A. B. Delone  M. I. Divlekeev  E. A. Sukhanov  R. A. Gulyaev  G. V. Yakunina  G. A. Porfir’eva 《Astronomy Reports》2008,52(2):152-156

Sodium emission fromthe zone of circumsolar sublimation of interplanetary dust was searched for during the total solar eclipse of March 29, 2006, using a Fabry-Perot interferometer and interference filter transmitting at 590 nm. The upper limit for the column density sodium atoms is 2 × 10⁸ atoms/cm², is based on the comparison with the atmospheric sodium emission. This result is compared with the brightness of the zodiacal light and F-corona, as well as the dust density directly measured onboard spacecraft.  相似文献   

General trends in the change in solar activity indices in the period from the late XX to early XXI century     

E. A. Bruevich  G. V. Yakunina 《Geomagnetism and Aeronomy》2015,55(8):1060-1065

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Solar-Flux Variation in Helium Lines According to SDO/EVE Data in the 24th Cycle and the Forecast for Different Levels of Solar Activity. Lyman Decrements of Hydrogen and Helium Lines     

Bruevich  E. A.  Kazachevskaya  T. V.  Yakunina  G. V. 《Geomagnetism and Aeronomy》2020,60(7):966-973

Geomagnetism and Aeronomy - The extreme ultraviolet radiation (EUV radiation) of the Sun is studied. The time series of daily values of the radiation fluxes outside flares in the EUV range are...  相似文献