Ionospheric modification at twice the electron cyclotron frequency

In 2004, a new transmission band was added to the HAARP high-frequency ionospheric modification facility that encompasses the second electron cyclotron harmonic at altitudes between approximately 220 and 330 km. Initial observations indicate that greatly enhanced airglow occurs whenever the transmis...

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Bibliographic Details
Published in:	Physical review letters Vol. 94; no. 12; pp. 125001.1 - 125001.4
Main Authors:	DJUTH, F. T, PEDERSEN, T. R, GERKEN, E. A, BERNHARDT, P. A, SELCHER, C. A, BRISTOW, W. A, KOSCH, M. J
Format:	Journal Article
Language:	English
Published:	Ridge, NY American Physical Society 01-04-2005
Subjects:	Exact sciences and technology Physics
Online Access:	Get full text
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Summary:	In 2004, a new transmission band was added to the HAARP high-frequency ionospheric modification facility that encompasses the second electron cyclotron harmonic at altitudes between approximately 220 and 330 km. Initial observations indicate that greatly enhanced airglow occurs whenever the transmission frequency approximately matches the second electron cyclotron harmonic at the height of the upper hybrid resonance. This is the reverse of what happens at higher electron cyclotron harmonics. The measured optical emissions confirm the presence of accelerated electrons in the plasma.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.94.125001