Wolf, Richard A.2016-04-222016-04-221972Lin, Chong'an. "Analysis of the sudden commencement of February 15, 1967." (1972) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/90358">https://hdl.handle.net/1911/90358</a>.https://hdl.handle.net/1911/90358A sudden commencement occurred at. 2348 UT on February 15, 1967 when the ATS-1 satellite was 2 hours past local noon at a geocentric distance of 6.6 Re. Plasma was observed by the Suprathermal ion Detector first to flow in the antisolar direction, as expected, but then to flow westward, for about 2 minutes, at about 50 km/sec. Analysis of ground magnetograms suggests that the surprising westward flow at 6.6 R resulted the ionosphere's reaction to the sudden commencement. Beginning about 2 minutes before the start of westward flow at ATS-1,ground magnetometers near the foot of the ATS-1 field line recorded average magnetic-field deflections of about 100Y ,to the northeast. For an assumed height-integrated Hall conductivity of 1 mho, and a standoff distance of 7.2 R derived from Explorer 33 plasma data, the ground magnetic variations imply an electric field that agrees in magnitude and direction with that required to produce the observed flow at ATS-1.67 ppengCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.ThesisRICE1395reformatted digitalThesis SP.SCI. 1972 Lin