Study on the Outer Radiation Belt Location in the 23–24 Solar Cycles
The location of the outer radiation belt (ORB) was established using NOAA/Polar-orbiting Operational Environmental Satellite data of energetic electrons with energy exceeding 30 keV throughout the last two solar cycles (from 2001 to 2020). The ORB was found to be slightly altered (around 1 degree) in the European and North American sectors, but more than 3 degrees equatorward in the Siberian region. The displacements were qualitatively consistent with the IGRF-12 model’s prediction of a change in the geomagnetic field. The model, on the other hand, has a stronghold in the Siberian region. The equatorward shift of ORB is frequently underestimated. After 2012, the shift became more noticeable, which could be linked to a geomagnetic jerk that happened in 2012–2013. The shift of ORB to lower latitudes in the Siberian sector may contribute to a rise in the frequency of mid-latitude auroras in the Eastern Hemisphere.
Alexei V. Dmitriev
Department of Space Science and Engineering, National Central University, Taoyuan, Taiwan and Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow, Russia.
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