Physics
Scientific paper
Oct 1973
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973p%26ss...21.1713l&link_type=abstract
Planetary and Space Science, Volume 21, Issue 10, p. 1713-1729.
Physics
1
Scientific paper
A sudden commencement occurred at 2348 UT on 15 February 1967, when the ATS-1 satellite was about 2 hr past local noon at a geocentric distance of 6.6RE. Plasma was observed by the Suprathermal Ion Detector (SID) first to flow in the antisolar direction, as expected, but then to flow westward, for about 2 min, at about 50 km/sec. Analysis of ground magnetograms suggests that the surprising westward flow, which must have involved an electric field of about 10 mV/m at 6.6RE, resulted from the ionosphere's reaction to the sudden commencement. Beginning about 2 min before the start of the westward flow at ATS-1, ground magnetometers near the foot of the ATS-1 field line typically recorded magnetic-field deflections of about 70 γ, to the northeast. No attempt is made in this paper to explain these ground observations. However, taking the ground observations, assuming a height-integrated Hall conductivity of 1 mho, and a standoff distance of 7.2RE inferred from Explorer 33 solar-wind data, we derive a magnetospheric electric field that agrees in magnitude and direction with that required to produce the observed flow at ATS-1.
Lin Charles A.
Wolf Richard A.
Young Toby D.
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