Evolution of the outer plasmasphere during low geomagnetic activity observed by the EUV scanner onboard Planet-B

Details Evolution of the outer plasmasphere during low geomagnetic activity observed by the EUV scanner onboard Planet-B Evolution of the outer plasmasphere during low geomagnetic activity observed by the EUV scanner onboard Planet-B

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jgr...10527777y&link_type=abstract

Journal of Geophysical Research, Volume 105, Issue A12, p. 27777-27790

Physics

11

Magnetospheric Physics: Magnetosphere-Inner, Magnetospheric Physics: Plasmasphere, Magnetospheric Physics: Storms And Substorms, Magnetospheric Physics: Instruments And Techniques

Scientific paper

The extreme ultraviolet scanner onboard the Planet-B spacecraft has taken EUV images (He II 304 Å) of both the duskside plasmasphere and nearby outer magnetosphere on September 9-10, 1998. Even during a relatively quiet period the images have revealed that there is a significant amount of escape of plasmaspheric ions from the outer plasmasphere toward the magnetosphere. Such a phenomenon is not expected from the conventional teardrop model of the plasmasphere. Plasmaspheric materials of at least 2.9×1028 He+ ions were peeled off the main body of the plasmasphere within 12 hours. This quantity corresponds to an ion flux of 6.7×1024ions/s under the assumption that the He+/H+ ratio is 10%. If geomagnetic storms occur twice a month, this flux is comparable to the predictions for a stormtime transport. This suggests that the plasmasphere may provide the magnetosphere with significant amount of plasmas even when the geomagnetic activity is low.

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