The measured motions inside equatorial plasma bubbles

Details The measured motions inside equatorial plasma bubbles The measured motions inside equatorial plasma bubbles

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.8997h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Oct. 1, 1984, p. 8997-9008. Research supported by the University of I

Physics

39

Equatorial Atmosphere, Magnetohydrodynamic Flow, Space Plasmas, F Region, Flow Velocity, Plasma Drift, Velocity Distribution, Vertical Motion

Scientific paper

A preliminary study of the vertical and north-south horizontal ion motions in plasma bubbles in the near-equatorial ionosphere utilizing drift meter data from Atmosphere Explorer E is presented. High-resolution data show that the vertical ion velocity in some bubbles increases approximately linearly with (N(0)-N)/N, where N(0) is the background ion concentration and N is the bubble ion concentration. At sufficiently large N(0)/N the vertical ion velocity saturates, but often at a value substantially larger than the ratio of the gravitational acceleration to the ion neutral collision frequency. These larger than nominal velocities may result from background eastward electric fields and/or from a vertically elongated bubble cross section. The unanticipated observation that large poleward horizontal drifts accompany these vertical drifts seems to follow naturally from a redistribution of plasma along flux tubes as the plasma convects from the bottomside of the F region to high altitudes.

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