Show simple item record

Sub-oval proton aurora spots: Mapping relatively to the plasmapause

dc.contributor.authorYahnin, A.G.
dc.contributor.authorYahnina, T.A.
dc.contributor.authorFrey, H.
dc.contributor.authorPierrard, V.
dc.date2013
dc.date.accessioned2016-03-25T11:11:10Z
dc.date.available2016-03-25T11:11:10Z
dc.identifier.urihttps://orfeo.belnet.be/handle/internal/2893
dc.descriptionSub-oval proton auroras discovered by the IMAGE spacecraft correlate with EMIC waves (geomagnetic pulsations of the Pc1 range). This means that a common source of the waves and proton precipitation is the ion-cyclotron (IC) instability developing in the vicinity of the equatorial plane. Different forms of the proton auroras reflect different regimes of the IC instability and different conditions in the near-Earth equatorial magnetosphere. To understand what are the conditions for the generation of the sub-oval proton aurora one may map the aurora onto the equatorial plane and compare the projection with some important magnetospheric boundaries. In this report we compare the projection of so-called "proton aurora spots" with the location of the plasmapause. The latter is determined by the plasmapause formation model based on the quasi-interchange instability mechanism. The comparison shows that often the proton aurora spot source is located in the vicinity of the plasmapause or in the cold plasma gradient inside the plasmapause. In some events, the proton aurora spots map well outside the plasmapause. We assume that in the latter case the IC instability develops when westward drifting energetic protons interact with the cold plasma that was earlier detached from the plasmasphere.
dc.languageeng
dc.titleSub-oval proton aurora spots: Mapping relatively to the plasmapause
dc.typeArticle
dc.subject.frascatiEarth and related Environmental sciences
dc.audienceScientific
dc.subject.freeEnergetic protons
dc.subject.freeEquatorial planes
dc.subject.freeFormation model
dc.subject.freeGeomagnetic pulsation
dc.subject.freeMagnetospheric boundary
dc.subject.freePlasmapause
dc.subject.freeProton aurora
dc.subject.freeQuasi-interchange instability
dc.subject.freeGeomagnetism
dc.subject.freeMagnetosphere
dc.subject.freePlasma diagnostics
dc.subject.freePlasma stability
dc.subject.freeProtons
dc.source.titleJournal of Atmospheric and Solar-Terrestrial Physics
dc.source.volume99
dc.source.page61-66
Orfeo.peerreviewedYes
dc.identifier.doi10.1016/j.jastp.2012.09.018
dc.identifier.scopus2-s2.0-84877693632


Files in this item

Thumbnail
Name:
Yahnin(2013).pdf
Size:
2.034Mb
Format:
PDF
View/Open

This item appears in the following Collection(s)

Show simple item record