Ion and neutral motions observed in the winter polar upper atmosphere

Details Ion and neutral motions observed in the winter polar upper atmosphere Ion and neutral motions observed in the winter polar upper atmosphere

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgra..107.1476h&link_type=abstract

Journal of Geophysical Research (Space Physics), Volume 107, Issue A12, pp. SIA 17-1, CiteID 1476, DOI 10.1029/2002JA009359

Physics

Space Physics

6

Ionosphere: Polar Cap Ionosphere, Ionosphere: Ionosphere/Atmosphere Interactions (0335), Ionosphere: Plasma Convection, Ionosphere: Ionosphere/Magnetosphere Interactions (2736)

Scientific paper

Continuous samples of the ion drift are made near 800-km altitude from the DMSP satellite and compared with remote measurements of the F region neutral winds made from the ground at Eureka in the northern polar cap. These measurements are compared with each other and with variations in the interplanetary magnetic field and solar wind. Over a 6-day period, linear relationships between the north-south component of the IMF and the noon-midnight components of the ion and neutral drifts are used to determine the response times of the gas motions to changes in the solar wind driver. When the IMF is southward or weakly northward, the ion and neutral gas response begins almost immediately following a change in the solar wind driver. The time constant for the ion response is about 20 min, while for an F peak density of about 5 × 105 cm-3 the neutral time constant is 75 min. While significant variability exists, the 55-min time difference between the response times is consistent with the neutral-ion collision time prevailing in the F region at the time and location of the measurements. In the quasi-equilibrium state, antisunward ion drifts in excess of 150 m s-1 drive the neutral gas antisunward with speeds about 60% of the ion drift.

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