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Relation of anomalo...
Relation of anomalous F region radar echoes in the high-latitude ionosphere to auroral precipitation
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- Dahlgren, Hanna, 1980- (författare)
- KTH,Rymd- och plasmafysik
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- Schlatter, N. M. (författare)
- KTH,Skolan för elektro- och systemteknik (EES)
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- Ivchenko, Nickolay, 1976- (författare)
- KTH,Rymd- och plasmafysik
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- Roth, Lorenz (författare)
- KTH,Rymd- och plasmafysik
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(creator_code:org_t)
- 2017-03-22
- 2017
- Engelska.
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Ingår i: Annales Geophysicae. - : Copernicus Publications. - 0992-7689 .- 1432-0576. ; 35:3, s. 475-479
- Relaterad länk:
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https://angeo.copern...
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https://www.ann-geop...
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https://urn.kb.se/re...
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https://doi.org/10.5...
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Abstract
Ämnesord
Stäng
- Non-thermal echoes in incoherent scatter radar observations are occasionally seen in the high-latitude ionosphere. Such anomalous echoes are a manifestation of plasma instabilities on spatial scales matching the radar wavelength. Here we investigate the occurrence of a class of spatially localized anomalous echoes with an enhanced zero Doppler frequency feature and their relation to auroral particle precipitation. The ionization profile of the E region is used to parametrize the precipitation, with nmE and hmE being the E region peak electron density and the altitude of the peak, respectively. We find the occurrence rate of the echoes to generally increase with nmE and decrease with hmE, thereby indicating a correlation between the echoes and high-energy flux precipitation of particles with a high characteristic energy. The highest occurrence rate of > 20 % is found for hmE = 109 km and nmE = 1011. 9 m−3, averaged over the radar observation volume.
Ämnesord
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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