First application of a Petschek-type reconnection model with time-varying reconnection rate to THEMIS observations

Details First application of a Petschek-type reconnection model with time-varying reconnection rate to THEMIS observations First application of a Petschek-type reconnection model with time-varying reconnection rate to THEMIS observations

Apr 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jgra..11400c20k&link_type=abstract

Journal of Geophysical Research, Volume 114, CiteID A00C20

Physics

5

Magnetospheric Physics: Magnetic Reconnection (7526, 7835), Magnetospheric Physics: Magnetotail, Magnetospheric Physics: Substorms, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Magnetospheric Physics: Magnetospheric Configuration And Dynamics

Scientific paper

We present a method to determine the location of the reconnection site and the amount of reconnected magnetic flux out of an analytical time-dependent reconnection model and apply this method to disturbances observed on 2 February 2008 at about 0200 and 0815 UT by THEMIS B (P1). During these events, P1 detected two tailward propagating traveling compression regions, associated with typical variations in B z and B x . We find the reconnection site to be located at about -16 R E for the event at 0200 UT and -17.5 R E for the event at 0815 UT. These locations are consistent with simple timing considerations with respect to disturbances detected by the inner THEMIS spacecraft. The amount of reconnected flux in our 2-D model can be found to be in the order of 108 nT m for both events. The calculations for the reconnection site's location are done by using two approaches, i.e., by using the B z and the B x signals, yielding consistent results. The reconnected flux can be determined using B z and v z . Also, these results are in good agreement. A comparison between the disturbances detected by P1 and the modeled variations shows that our model describes disturbances in the magnetic field and the background plasma very well.

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