Sergey N. Kuznetsov

Dynamics of the Earth's Radiation Belts During the Time Period April 14‐24, 2002 – Experimental Data

We analysed the variations of radiation belt electrons observed during 14-24 April 2002 obtained on board CORONAS-F satellite (polar orbit at altitude of ∼500 km). Measurements of April 14 and 16 correspond to the quiet state of the radiation belts before a magnetic storm. The first storm connected with the M1/CME which occurred April 15 was observed near noon of the following day, next magnetic storm, connected with M2/CME which took place April 17, occurred April 19. As consequence the short time interval between both events strong changes have been observed in the Earths radiation belt. Significant decrease of electron fluxes in wide energy range was observed in the outer radiation belt April 17 and early morning April 18. During April 18 and 19 the electron flux intensity increased in the outer radiation belt and the location of the peak flux shifted from 4.5 to 3.2 in the nightside and from 5 to 3.5 in the dayside. The next increase of electron flux was observed after the next magnetic storm during April 19-20 both in the inner and outer radiation belts.

Energetic Trapped Proton and Electron Flux Variations at Low Altitudes Measured Onboard CORONAS‐F Satellite During 2001, August–December, their Connection with the Particle Flux Variations in Geostationary Orbit

Trapped energetic particle variations at altitudes of ∼500 km were studied using data obtained in the experiment onboard the «CORONAS-F» satellite (launched in July, 2001). Results of analysis of proton (1-5 MeV) and electron (0.6-1.5 MeV) flux variations at different L-shells (from 3 to 5.5) from August to December, 2001 are presented. Connection of these particle flux variations with particle flux dynamics measured onboard the «GOES» satellite were analysed. We found strong correlation between proton fluxes measured onboard the «CORONAS-F» satellite and ones measured onboard the «GOES» satellite without any time lag and significant correlation during quiet time periods for electron flux with different time lag for different L-shell values (about 5 days for L = 3 and about 1 day for L from 4 to 5).

Large solar flares of October - November, 2003 - development in Soft X-ray, Hard X-ray and gamma-ray emissions.

The description of two major flares detected by SONG spectrometer on board the CORONAS-F mission during famous period of solar activity in October- November 2003 and their comparison with soft X-ray measured by GOES-12 is given.

The effect of a geomagnetic storm on energetic trapped protons at low altitudes

Abstract The irreversible changes of the intensity of trapped protons with energy above 1 MeV in the Earths magnetosphere near the outer boundary of trapping are observed after moderate geomagnetic storms on the low-altitude polar-orbiting satellite Intercosmos-17 . These changes are interpreted in terms of nonadiabatical effects of proton motion in the disturbed geomagnetic field (assuming D st variation) which affects the conditions for stable trapping of protons during the storm. The decrease of proton intensity is due to an adiabatic decrease of energy, an increase of mirror-point altitude and nonadiabatic scattering and losses. The interaction of two types of particle motion—gyrorotation and the ‘bounce’ motion, which leads to the instability of motion, is assumed. The importance of nonadiabatical losses of trapped protons with low equatorial pitch angles for changes near the proton boundary is pointed out.