Show simple item record

dc.contributor.authorMaes, L.
dc.contributor.authorMaggiolo, R.
dc.contributor.authorDe Keyser, J.
dc.contributor.authorAndré, M.
dc.contributor.authorEriksson, A.I.
dc.contributor.authorHaaland, S.
dc.contributor.authorLi, K.
dc.contributor.authorPoedts, S.
dc.date2017
dc.date.accessioned2017-12-22T14:32:04Z
dc.date.available2017-12-22T14:32:04Z
dc.identifier.urihttps://orfeo.belnet.be/handle/internal/6358
dc.descriptionPolar wind outflow is an important process through which the ionosphere supplies plasma to the magnetosphere. The main source of energy driving the polar wind is solar illumination of the ionosphere. As a result, many studies have found a relation between polar wind flux densities and solar EUV intensity, but less is known about their relation to the solar zenith angle at the ionospheric origin, certainly at higher altitudes. The low energy of the outflowing particles and spacecraft charging means it is very difficult to measure the polar wind at high altitudes. We take advantage of an alternative method that allows estimations of the polar wind flux densities far in the lobes. We analyze measurements made by the Cluster spacecraft at altitudes from 4 up to 20 RE. We observe a strong dependence on the solar zenith angle in the ion flux density and see that both the ion velocity and density exhibit a solar zenith angle dependence as well. We also find a seasonal variation of the flux density.
dc.languageeng
dc.titleSolar Illumination Control of the Polar Wind
dc.typeArticle
dc.subject.frascatiPhysical sciences
dc.audienceScientific
dc.subject.freelow-energy ions
dc.subject.freeion outflow
dc.subject.freepolar wind
dc.subject.freemagnetosphere
dc.subject.freesolar illumination
dc.subject.freeionosphere
dc.source.titleJournal of Geophysical Research: Space Physics
dc.source.volume122
dc.source.issue11
dc.source.page11468-11480
Orfeo.peerreviewedYes
dc.identifier.doi10.1002/2017JA024615


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record