An analysis of pump-induced artificial ionospheric ion upwelling at EISCAT

Kosch, M.J. and Ogawa, Y. and Rietveld, M.T. and Nozawa, S. and Fujii, R. (2010) An analysis of pump-induced artificial ionospheric ion upwelling at EISCAT. Journal of Geophysical Research, 115 (A12317). pp. 1-9. ISSN 0148-0227

PDF (art_1021.pdf)

Download (637kB)


Ion outflow from the high-latitude ionosphere is a well-known phenomenon and an important source of plasma for the magnetosphere. It is also well known that pumping the ionosphere with high-power high-frequency radio waves causes electron heating. On a few occasions, this has been accompanied by artificially induced ion upwelling. We analyze such a controlled experiment at EISCAT up to 600 km altitude. The pump-enhanced electron temperatures reached up to ∼4000 K above 350 km, and ion upwelling reached up to ∼300 m/s above 500 km altitude. The pump-induced electron pressure gradient can explain the ion velocity below 450 km. Between 450 and 600 km the electron pressure gradient correlates equally with ion acceleration and ion velocity, which represents the transition altitude to free ion acceleration. The electron gas pressure gradient can explain ion upwelling, at least up to 600 km altitude. In addition, such active experiments open the possibility to estimating the F layer ion-neutral collision frequency and neutral density with altitude from ground-based observations.

Item Type: Journal Article
Journal or Publication Title: Journal of Geophysical Research
Additional Information: Copyright (2010) American Geophysical Union. Further reproduction or electronic distribution is not permitted.
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/1900/1912
Departments: Faculty of Science and Technology > School of Computing & Communications
Faculty of Science and Technology > Physics
ID Code: 35539
Deposited By: Dr Steve Marple
Deposited On: 21 Jan 2011 12:02
Refereed?: Yes
Published?: Published
Last Modified: 16 Sep 2019 00:33

Actions (login required)

View Item View Item