Physics
Scientific paper
Jan 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989georl..16...13s&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 16, Jan. 1989, p. 13-16.
Physics
91
Dynamic Pressure, Magnetospheric Instability, Solar Wind, Lines Of Force, Magnetic Signatures, Space Plasmas, Time Response, Transient Response
Scientific paper
The magnetospheric response to two types of sudden variations in solar wind dynamic pressure: step function increases and brief pulses, are considered. Contrary to the prevailing view, it is found that some transient ground events with bipolar north-south signatures are related to variations in solar wind dynamic pressure and not necessarily to magnetic merging. Simultaneous solar wind plasma observations are presented for two previously reported transient ground events observed at dayside auroral latitudes and associated with the signatures of flux transfer events. It is shown that the event reported by Lanzerotti et al. (1987) was accompanied by a sharp increase in solar wind dynamic pressure, a magnetospheric compression and a consequent ringing of the magnetospheric magnetic field.
Baumjohann Wolfgang
Lopez Robert E.
Sibeck David G.
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