ИСТИНА

Precipitation of energetic (> 39 keV) protons and relativistic (> 800 keV) electrons was studied with NOAA Polar-orbiting Operational Environmental Satellites (NOAA POES) at subauroral and auroral (50 -75 CGMLat) latitudes. These satellites have circular orbits at altitudes ~810–870 km. Although NOAA POES are not equipped with a special instrument for observation of the MeV electrons, these particles can be studied using the data from one of the proton telescope channels (P6), which was originally designed to detect the protons with energies >6.9 MeV. To measure charged particles with energy E > 30 keV, NOAA POES are equipped with the Medium Energy Proton and Electron Detector. Magnetometer in observatory Lovozero at Kola Peninsula operated by Polar Geophysical Institute in Apatity/Murmansk, Russia was used to observe geomagnetic pulsations in the range of 0.1–5 Hz. The magnetic field calculated near the low orbiting satellites was taken from the OMNI data. We analyze the fluxes of energetic protons and relativistic electrons in magnetically conjugate regions during several events when Pc1 geomagnetic pulsations at frequencies above 2 Hz were detected at the observatory Lovozero. All events were observed after a long substorm activity with an auroral activity index AE = 400–700 nT and at high (>430 km/s) solar wind speed. This study shows the influence of the interhemispheric asymmetry of the Earth's magnetic field on the intensity of relativistic electron fluxes and, to a lesser extent, on energetic proton fluxes. The flux intensity increases with a decrease in the magnetic field at the orbit of the low-orbiting satellite. The lower the magnetic field, the longer the observation time of these fluxes. As the magnetic field decreases, the isotropy boundary is shifted toward the equator.