A mechanism for extraordinary bright radiowave-induced aurora in the ionospheric E region

We will show that the presence of height-extended ionization in the night-time ionospheric E region during high-power radiowave transmission into the magnetic zenith could allow for strong self-focusing of the transmitter beam due to the resonance instability near the upper-hybrid resonance level (t...

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Bibliographic Details
Published inJournal of atmospheric and solar-terrestrial physics Vol. 71; no. 5; pp. 553 - 558
Main Authors Kagan, L.M., MacDougall, J.W., Kelley, M.C.
Format Journal Article
LanguageEnglish
Published Kidlington Elsevier Ltd 01.04.2009
Elsevier
Subjects
Active experiments
E region
Earth, ocean, space
Exact sciences and technology
External geophysics
Ionosphere
Physics of the ionosphere
Physics of the magnetosphere
Radiowave-induced optical emissions
Active experiments
Radiowave-induced optical emissions
Ionosphere
E region
Self focusing
Night
Upper hybrid resonance
Parametric instability
Aurorae
Light emission
Ionization
Height
Radiated power
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Summary:We will show that the presence of height-extended ionization in the night-time ionospheric E region during high-power radiowave transmission into the magnetic zenith could allow for strong self-focusing of the transmitter beam due to the resonance instability near the upper-hybrid resonance level (the so-called magnetic zenith effect, never before reported for the E region) and for unusually strong enhancement in effective radiowave power due to the parametric instability, occurring in the Langmuir resonance region. This leads to 36–40 times higher effective radiated power and 36–40 times brighter optical emissions as was observed during the extraordinary bright (4 kR) radiowave-induced 557.7-nm aurora event.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1364-6826
1879-1824
DOI:10.1016/j.jastp.2009.01.006