Midday magnetopause shifts earthward of geosynchronous orbit during geomagnetic superstorms with Dst ≤ -300 nT

Details Midday magnetopause shifts earthward of geosynchronous orbit during geomagnetic superstorms with Dst ≤ -300 nT Midday magnetopause shifts earthward of geosynchronous orbit during geomagnetic superstorms with Dst ≤ -300 nT

Aug 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jgra..11508230l&link_type=abstract

Journal of Geophysical Research, Volume 115, Issue A8, CiteID A08230

Physics

2

Magnetospheric Physics: Magnetic Storms And Substorms (7954), Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Interplanetary Physics: Interplanetary Magnetic Fields, Magnetospheric Physics: Magnetosheath

Scientific paper

Geomagnetic storm intensity, as measured by the Dst (SYMH) index, shows no limit as the solar wind dawn-to-dusk electric field increases. We show that the magnetopause around noon erodes earthward with increasing storm intensity. The panoramic geosynchronous BZ signatures for the magnetic storm groups with different intensity are differ significantly from each other. For superstorms with SYMH ≤ -300 nT, the magnetopause around noon erodes to inside the geosynchronous orbit, which causes the BZ reversal near local noon. The necessary conditions for superstorms with SYMH ≤ -300 nT to occur include the following: (1) interplanetary magnetic field (IMF) BZ < -27 nT lasts for at least ˜1 h; (2) solar wind dynamic pressure, Pd > ˜ 12 nPa; (3) the projected interplanetary electric field, EK - L > ˜30 mV/m.

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