[P-EM12] 大気圏ー電離圏結合

[PEM12-P01] LOW IONOSPHERE AS A SOURCE OF REMOTE SENSING

*ALEXEI DMITRIEV^1,2、S.O. Adamson³、A.A. Berlin⁴、Y.A. Dyakov⁵、L.V. Eppelbaum⁶、G.V. Golubkov^3,5、A.A. Lushnikov⁶、M.I. Manzhelii⁷、M.G. Golubkov³ (1.Institute of Space Science and Engineering, National Central University, Jungli City, Taiwan、2.Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow, Russia、3.Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, Moscow 119991, Russian Federation 、4.Department of Earth Sciences, Tel Aviv University, Tel Aviv 69978, Israel、5.National Research Center “Kurchatov Institute”, Moscow 123182, Russian Federation、6.Geophysical Center, Russian Academy of Sciences, Moscow 119296, Russian Federation、7.Center for Chemical Physics of Atmosphere, Moscow 119991, Russian Federation)

キーワード：bottomside ionosphere, remote sensing

One of the fundamental problems of remote sensing is to establish the nature of the source of decimeter microwave radiation, taking into account the dependence of its intensity on the current state of the atmosphere and to determine the interfering factors of radiation propagation (charged aerosol layers, their hydration, etc.). This leads to uncontrolled behavior of the measured intensity and to difficulties in calibrating the receiving equipment.

It was previously assumed that this source has a cosmic origin and corresponds to the radiation of a hydrogen radio line observed at radio telescopes with a wavelength of 21 cm and a transition frequency of 1.4204 GHz. The estimates show that the power of the flux of cosmic radiation arriving at the radiometer is several orders of magnitude lower than the flux density of its own incoherent microwave radiation D and E of the layers of the ionosphere in the decimeter range. Therefore, incoherent super background decimeter radiation, which is formed at an altitude of 80–110 km due to the population of Rydberg states, is the main source.
Since the source is located below the orbiting satellites, a fundamentally new method for making the necessary measurements is proposed.