Multipoint observations of transient event: Case study

Details Multipoint observations of transient event: Case study Multipoint observations of transient event: Case study

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm31b1526k&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM31B-1526

Physics

[2724] Magnetospheric Physics / Magnetopause And Boundary Layers, [2784] Magnetospheric Physics / Solar Wind/Magnetosphere Interactions

Scientific paper

Our initial inspection of the THEMIS data indicates that there are two kinds of transient events observed at the magnetopause that satisfy the classical criteria: FTEs and impulsive or solitary waves with bipolar magnetic field fluctuations normal to the nominal magnetopause. The impulsive events correspond to well-known magnetic impulse events (MIEs) in ground magnetograms. Our study focuses on THEMIS observations of a long-duration transient event in the vicinity of the dayside magnetopause that was characterized by bipolar (-,+) signatures in the Bn component, positive monopolar variation in Bl and Bm components and an ~8 nT enhancement in the total magnetic field. Plasma observations at the time of this event show features typical of magnetospheric FTE. We seek to distinguish between two types of transient event. Geosynchronous GOES spacecraft observations showed a clear compression of the magnetosphere, and there was a transient perturbation of the magnetic field at South Pole at this time. All of these above indicate that the transient event was not an FTE, but rather an impulsive event corresponding to an MIE in ground magnetograms.

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