Numerical calculations and observations of the energy degradation of auroral protons and associated Balmer emission profiles in the u

摘要

Abstract: The volume emission rates of auroral proton/hydrogen particles in the upper atmosphere is derived using laboratory coefficients for energy degradation and emission cross sections. Doppler broadened Balmer emissions are measured with the field of view of the spectrometer in the geomagnetic meridian plane, and indications of energy and pitch-angle distributions are obtained by fitting the expressions of the calculated Doppler profiles to the measured profiles. Using a limited amount of data and comparing with the model calculations indicate that the energy spectra of the auroral protons are relatively soft at 74$DGR geomagnetic north, and have a broad and variable pitch-angle distribution. !6