Interplanetary magnetic field orientation for transient events in the outer magnetosphere

Details Interplanetary magnetic field orientation for transient events in the outer magnetosphere Interplanetary magnetic field orientation for transient events in the outer magnetosphere

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jgr...100..175s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 100, no. A1, p. 175-183

Physics

8

Flux Transfer Events, Interplanetary Magnetic Fields, Magnetic Fields, Magnetic Flux, Magnetosheath, Daytime, Directivity, Statistical Analysis

Scientific paper

It is generally believed that flux transfer events (FTEs) in the outer dayside magneosphere, usually identified by transient (approximately 1 min) bipolar magneitc field perturbations in the direction normal to the nominal magnetopause, occur when the magnetosheath magetic field has a southward component. We compare the results of three methods for determining the magnetosheath magnetic field orientationat the times of previously identified UKS/IRM events: (1) the average magnetosheath magnetic field orientation in the 30-min period adjacent to the nearest magnetopause crossing, (2) the magnetosheath magnetic field orientation observed just outside the magnetopause, and (3) the lagged interplanetary magnetic field (IMF) orientation at the time of the transient events. Whereas the results of method 2 indicate that the events tend to occur for a southward magnetosheath magnetic field, the results of methods 1 and 3 show no such tnedency. The fact that the three methods yield significantly diffeent results emphasizes the need for caution in future studies.

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