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Relation of anomalous F region radar echoes in the high-latitude ionosphere to auroral precipitation
KTH, School of Electrical Engineering (EES), Space and Plasma Physics. KTH, School of Electrical Engineering (EES), Centres, Alfvén Laboratory Centre for Space and Fusion Plasma Physics.ORCID iD: 0000-0001-5596-346X
KTH, School of Electrical Engineering (EES), Space and Plasma Physics.ORCID iD: 0000-0001-6802-1842
KTH, School of Electrical Engineering (EES), Space and Plasma Physics. KTH, School of Electrical Engineering (EES), Centres, Alfvén Laboratory Centre for Space and Fusion Plasma Physics.ORCID iD: 0000-0003-2422-5426
KTH, School of Electrical Engineering (EES), Space and Plasma Physics.ORCID iD: 0000-0003-0554-4691
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2017 (English)In: Annales Geophysicae, ISSN 0992-7689, E-ISSN 1432-0576, Vol. 35, no 3, p. 475-479Article in journal (Refereed) Published
Abstract [en]

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 D 10(11.9) m(-3), averaged over the radar observation volume.

Place, publisher, year, edition, pages
Copernicus Gesellschaft , 2017. Vol. 35, no 3, p. 475-479
Keywords [en]
Ionosphere (auroral ionosphere particle precipitation, plasma waves and instabilities)
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:kth:diva-205454DOI: 10.5194/angeo-35-475-2017ISI: 000398189600002OAI: oai:DiVA.org:kth-205454DiVA, id: diva2:1098552
Funder
Swedish Research Council, 350-2012-6591VINNOVA, 2014-01459
Note

QC 20170524

Available from: 2017-05-24 Created: 2017-05-24 Last updated: 2018-02-28Bibliographically approved

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Dahlgren, HannaSchlatter, Nicola ManuelIvchenko, NickolayRoth, LorenzKarlsson, Alexander

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