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dc.contributor.authorKosch, Michael
dc.contributor.authorVickers, Hannah
dc.contributor.authorOgawa, Yasunobu
dc.contributor.authorSenior, Andrew
dc.contributor.authorBlagoveshchenskaya, Natalya
dc.date.accessioned2022-07-01T11:25:27Z
dc.date.available2022-07-01T11:25:27Z
dc.date.issued2014-10-24
dc.description.abstractWe have developed an active ground-based technique to estimate the steady state field-aligned anomalous electric field (E*) in the topside ionosphere, up to ~600 km, using the European Incoherent Scatter (EISCAT) ionospheric modification facility and UHF incoherent scatter radar. When pumping the ionosphere with high-power high-frequency radio waves, the F region electron temperature is significantly raised, increasing the plasma pressure gradient in the topside ionosphere, resulting in ion upflow along the magnetic field line. We estimate E* using a modified ion momentum equation and the Mass Spectrometer Incoherent Scatter model. From an experiment on 23 October 2013, E* points downward with an average amplitude of ~1.6 μV/m, becoming weaker at higher altitudes. The mechanism for anomalous resistivity is thought to be low-frequency ion acoustic waves generated by the pump-induced flux of suprathermal electrons. These high-energy electrons are produced near the pump wave reflection altitude by plasma resonance and also result in observed artificially induced optical emissions.en_US
dc.identifier.citationKosch M, Vickers H, Ogawa, Senior, Blagoveshchenskaya. First observation of the anomalous electric field in the topside ionosphere by ionospheric modification over EISCAT. Geophysical Research Letters. 2014;41(21):7427-7435en_US
dc.identifier.cristinIDFRIDAID 1185734
dc.identifier.doi10.1002/2014GL061679
dc.identifier.issn0094-8276
dc.identifier.issn1944-8007
dc.identifier.urihttps://hdl.handle.net/10037/25720
dc.language.isoengen_US
dc.publisherWileyen_US
dc.relation.journalGeophysical Research Letters
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2014 The Author(s)en_US
dc.titleFirst observation of the anomalous electric field in the topside ionosphere by ionospheric modification over EISCATen_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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