Abstract
Coordinated photometer and incoherent scatter radar measurements with high time resolution (0.1 s) were made on 1 February 1987 in order to investigate auroral pulsations. Also a low light level TV-camera operated in real speed mode during the experiment. The total energy flux and characteristic energy of Maxwellian energy distribution were measured with a field-aligned multichannel photometer. The radar beam crossed the photometer beam at an altitude of 110 km, where the electron density was modelled successfully using a characteristic energy of ~ 2 keV. With the time resolution of 1.0 s also electron density pulsations were seen, showing correlation with the optical pulsations. Furthermore, during the observed pulsating arcs enhanced electron densities were found in the altitude range of 85–100 km. This indicates a hardening of the precipitating electrons. This change has been modelled by double-Maxwellian distribution with characteristic energies of about 1.3 and 7 keV.
Published Version
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