HF pump-induced electron heating and artificial airglow at high latitudes: Aspect angle dependence

Rietveld, M. T. and Kosch, M. J. and Blagoveshchenskaya, N. F. and Kornienko, V. A. and Leyser, T. B. (2002) HF pump-induced electron heating and artificial airglow at high latitudes: Aspect angle dependence. In: 29th General Assembly of the International Union of Radio Science, 1900-01-01.

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Abstract

Large electron temperature increases (~3000 K) in the ionospheric F-region, produced by powerful HF wave injection, were measured using the EISCAT incoherent scatter radar near Tromsø, Norway, on 7 October 1999. Magnetic fieldaligned measurements showed HF-initiated ion outflows reaching several hundred ms-1 at 580 km. When scanning the radar antenna from field-aligned (77.2deg southward) to vertical, the strongest heating effects were always in the fieldaligned position, irrespective of the HF beam direction which was varied. The imaged 630 nm HF-enhanced airglow also remained localized near field-aligned. Why the strongest heating effects occur for HF rays transmitted along the magnetic field is unclear.

Item Type:
Contribution to Conference (Other)
Journal or Publication Title:
29th General Assembly of the International Union of Radio Science
Additional Information:
P1347
Subjects:
ID Code:
6733
Deposited By:
Deposited On:
16 Jun 2008 16:28
Refereed?:
No
Published?:
Published
Last Modified:
09 Aug 2020 00:12