Co-ordinated IMAGE satellite and ground-magnetometer observations of a cross-phase reversal at a steep plasmapause.

Details Co-ordinated IMAGE satellite and ground-magnetometer observations of a cross-phase reversal at a steep plasmapause. Co-ordinated IMAGE satellite and ground-magnetometer observations of a cross-phase reversal at a steep plasmapause.

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm21a0456d&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM21A-0456

Other

2730 Magnetosphere: Inner, 2740 Magnetospheric Configuration And Dynamics, 2768 Plasmasphere, 2772 Plasma Waves And Instabilities, 2794 Instruments And Techniques

Scientific paper

For a few hours during the local morning of the 14th May 2001 the cross-phase peak observed using European sector ground-based magnetometer station pairs with mid-points at L = 3.16 and L = 3.34 changed polarity from positive to negative. All other BGS, SAMNET and IMAGE station pairs examined showed a positive cross-phase peak throughout the day. The IMAGE satellite made an excellent close conjunction with these ground-based magnetometer arrays on this day, and data from the RPI instrument shows a very steep plasmapause in this region during this UT. IMAGE EUV results show that the plasmapause moved outward through the day, passing through the region of observed negative cross-phase peak. The observed negative cross-phase peak is theoretically expected at a plasmapause with a gradient steeper than r-8, but is rarely observed. The observations also infer the presence of an enhanced heavy ion population outside the plasmapause in the inner plasmatrough on this day. We discuss the possibility that refilling through the day reduced the gradient of the initially steep plasmapause, eventually removing the negative cross-phase peak.

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