Proton Radiation Belt Dynamics in Low Earth Orbits Interrelated with Solar Activity
Abstract
Existing empirical radiation belt models do not able to calculate trapped particle fluxes with taking into account changing solar activity. Widely using AP-8 model allows to evaluate proton fluxes just in two cases: for minimum or maximum of a solar cycle. New AP-9 model is under developing. Also new additional possibilities for experimental study of radiation belt dynamics is opened up. Since 2006 year PAMELA and ARINA experiments onboard satelite RESURS-DK1 are carried out. PAMELA is in the first place spectrometer to study antiparticles in cosmic rays. The ARINA instrument is intended studying high-energy charged particle bursts in the magnetosphere. Along with such fundamental goals these instruments give opportunity to carry out measurements of trapped particles in the inner radiation belt. Complex of two mentioned instruments covers proton energy range from 30 MeV up to energy limit for trapping (~2 GeV). Continuous measurements with PAMELA and ARINA include falling and rising phases of 23/24 solar cycles. In this report we present temporal profile of proton fluxes in the inner zone of the radiation belt (1.11<L<1.20, 0.18<B<0.22 Gs). Dependence of proton fluxes on level of solar activity (sunspot number) was revealed. At that it was shown that proton fluxes of energies >30MeV at the solar minimum several times greater than at the solar maximum.
- Publication:
-
40th COSPAR Scientific Assembly
- Pub Date:
- 2014
- Bibcode:
- 2014cosp...40E1959M