Evolution of the plasmoid-lobe interaction with downtail distance

Details Evolution of the plasmoid-lobe interaction with downtail distance Evolution of the plasmoid-lobe interaction with downtail distance

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.2765s&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 24, p. 2765-2768

Physics

8

Magnetic Fields, Magnetic Flux, Magnetohydrodynamics, Magnetopause, Plasma Interactions, Plasmas (Physics), Evolution (Development), International Sun Earth Explorers, Signatures, Wave Fronts

Scientific paper

This study examines the interaction between plasmoids moving anti-sunward at high speeds and the tail lobes which bound them to the north and south. Attention is focused on the influence of changing lobe conditions with downtail distance. It is shown using International Sun Earth Explorer 3 (ISEE 3) measurements that the gradual filling of the lobes with mantle plasma and the decrease in magnetic field intensity reduces the average lobe MHD fast mode speed from 1200 km/s at X = -80 R(sub E) to 400 km/s at X = -220 R(sub E). This results in the ratio of the plasmoid speed to the fast mode speed increasing with downtail distance, from 0.3 at X = -80 R(sub E) to approx. 1 at X = -220 R(sub E). It is argued that the 'standard' traveling compression region (TCR) signature observed closer to the Earth will be distorted at large distances, where the fast mode transit time between the plasmoid and magnetopause becomes long compared to the time for the plasmoid to move past a given point in the tail. This change in the nature of the plasmoid-lobe interaction with downtail distance is offered as an explanation for why the reported rate of TCR occurrence peaks at X = -60 to -130 R(sub E) and decreases in the more distant fail.

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