Measurements of bursts in plasma velocity during substorm activity.

Details Measurements of bursts in plasma velocity during substorm activity. Measurements of bursts in plasma velocity during substorm activity.

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13q.139l&link_type=abstract

Advances in Space Research, Vol. 13, No. 4, p. 139 - 142

Physics

4

Scientific paper

A combination of observations by EISCAT and STARE confirm the existence of bursts of plasma velocity in the auroral electrojet covering about 2° of latitude and 5° of longitude. Where simultaneous measurements of the IMF are available, it can be shown that the auroral electrojet on the nightside is characterised by such bursts even when the IMF is changing very slowly. Cross-correlation between the input of energy from the solar wind and the electric field measured in the electrojet show that with a low-pass filter there is a high and significant correlation, but when the calculation is repeated with a high-pass filter the correlation is low and is not significant at 10%. This suggests that these bursts are not directly driven by changes in the IMF but originate in the magnetotail - a conclusion supported by the way in which the bursts appear to drift in the same direction as the average plasma velocity, away from the Harang discontinuity.

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