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

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 hun...

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Bibliographic Details
Main Authors: Rietveld, M. T., Kosch, M. J., Blagoveshchenskaya, N. F., Kornienko, V. A., Leyser, T. B.
Format: Conference Object
Language:English
Published: 2002
Subjects:
Norway
Tromsø
EISCAT
Online Access:https://eprints.lancs.ac.uk/id/eprint/6733/
https://eprints.lancs.ac.uk/id/eprint/6733/1/inproc_264.pdf
Description
Summary: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.

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