The spectral hardening associated with the westward travelling surge

Details The spectral hardening associated with the westward travelling surge The spectral hardening associated with the westward travelling surge

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981p%26ss...29.1011s&link_type=abstract

Planetary and Space Science, vol. 29, Sept. 1981, p. 1011-1017.

Astronomy and Astrophysics

Astronomy

6

Auroral Spectroscopy, Auroras, Ionospheric Storms, Spectral Energy Distribution, Surges, Astronomical Photometry, Ionospheric Disturbances, Magnetospheric Instability, Particle Precipitation, Solar Terrestrial Interactions

Scientific paper

Photometer recordings of auroral emissions from N2(+) and OI have demonstrated that the ratios between the emissions show a characteristic plateau just prior to the passage of a westward traveling surge. The plateau may be interpreted as a temporary (approx. 1 min) cessation in the spectral hardening of the precipitating particles associated with the surge. The characteristic energy of the plateau is about 1 keV above the level prior to the beginning of the surge. The results have been interpreted in terms of an instability that is switched on during the time of the plateau and then turned off when the electron density is increased above a certain limit.

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