A model of SVC radiation in magnetic dipole field and radiation varying with magnetic field. I - Active region model and SVC radiation source model

Mathematics – Logic

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Chromosphere, Magnetic Dipoles, Radiant Flux Density, Solar Corona, Solar Magnetic Field, Solar Radio Emission, Brightness Distribution, Electron Energy, Radiation Distribution, Solar Activity, Solar Wind

Scientific paper

The present model of slowly-varying-component (SVC) radiation in a magnetic dipole field employs the latest EUV data on the chromosphere-corona transition region. It is assumed that the plasma conditions above an active region are varying continuously from the center of the region to the adjacent quiet region. The plasma's three physical parameters (electron temperature and density, and magnetic field) are taken to be functions of both the height above the photosphere and the distance from the active region's central axis. A dipole magnetic field and the present model of the electron temperature and density are used to calculate the radio radiation of the SVC and to investigate the radiative characteristics of the SVC radiation, the geometrical features of the SVC radiation source, and their variations with the magnetic fields. The results agree quite well with the observations.

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