Height distribution of electron fluxes with energies above 40 keV at mid-latitudes

1Grachev, EA, 1Grigoryan, OP, 2Kudela, K, 3Petrov, AN, 3Sheveleva, VN
1D.V. Skobeltsin Scientific Research Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow, Russia
2Institute of Experimental Physics SAS , Košice, Slovakia
3Scientific Research Institute of Nuclear Physics. D.V. Skobeltsyna, Moscow State University, Moscow, Russia
Kosm. nauka tehnol. 2002, 8 ;(Supplement2):055-064
Publication Language: Russian
Abstract: 
The results of the analysis of the experiment aboard the “Active” artificial satellite (altitude 500–2500 km, inclination 82.6 °) for recording electron precipitations with energy Ee = 40–500 keV in the region of mid-latitudes (L = 1.2–1.8) are presented. The dependence of electron fluxes on height, level of geomagnetic activity, and local time for various energies is analyzed. It was found that at L = 1.2–1.8 at altitudes of 350–1300 km there are areas of increased electron fluxes, at an altitude of 1500 km these areas become blurred in latitude, they have a longitude dependence, and the distribution of electrons depends on the level of geomagnetic activity and local time. The presence of electron fluxes in the northern hemisphere in the region of the magnetically conjugate South Atlantic anomaly (SAA) may be due to the fact that some electrons trapped in the SAA region are reflected from the atmosphere.
References: 
1. Nagata K., Kohno T., Murakami H., et al. Electron (0.19-3.2 MeV) and proton (0.58-35 MeV) precipitations observed by OHZORA satellite at low zones L=1.6-1.8. Planet. Space Sci., 36, 591 (1988).
2. Kudela K., et al. Inner zone electron peaks observed by the “Active” satellite. J. Geophys. Res., 97, 8681 (1992).
3. Biryukov A. S., Grigoryan O. R., Kuznetsov S. N., et al. Low-energy charged particles at near equatorial latitudes according to “MIR” orbital station data. Adv. Space Res., 17 (10), (10)189-(10)192 (1996).
4. Biryukov A. S., Grigoryan O. R., Kuznetsov S. N., et al. Specific features of electron distributions at altitudes of 400 km. Adv. Space Res., 21 (12), 1665-1668 (1999).
5. Kuznetsov S. N., Myagkova I. N. Quasi-trapped electron fluxes (>0.5 MeV) under the radiation belts: analysis of their connection with geomagnetic indices. J. of Atm. and Solar-Terr. Phys., 64 (2002).
6. Spjeldvik W. N. Radiation belt electrons: structure of the loss cone. J. Geophys. Res., 82 (4), 709-713 (1977).

7. Leinbach H., Willams D. J. Evidence for very weak pitch angle diffusion of outer zone electrons. J. Geophys. Res., 82 (32), 5091-5098 (1977).