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The influence of a southward and northward turning of the interplanetary magnetic field on the geomagnetic cut-off of cosmic rays, on the mirror points positions of geomagnetically trapped particles, and on their rate of precipitations in the atmosphere

dc.contributor.authorLemaire, J.F.
dc.contributor.authorBatteux, S.G.
dc.contributor.authorSlypen, I.N.
dc.date2005
dc.date.accessioned2016-12-07T10:36:06Z
dc.date.available2016-12-07T10:36:06Z
dc.identifier.urihttps://orfeo.belnet.be/handle/internal/4623
dc.descriptionA number of geomagnetic observations indicate that the orientation of the interplanetary magnetic field (IMF) plays a definite role in triggering several magnetospheric processes. In this theoretical study based on the superposition of a dipole geomagnetic field model and an uniform IMF, it is shown that when the northward component of the IMF decreases (dBz/dt < 0), the geomagnetic cut-off surface moves to larger equatorial distances, the altitude of the mirror points of charged particles trapped in the geomagnetic field increases, and the value of their equatorial pitch angle decreases. Furthermore, we show that the loss cone angle of trapped particles decreases when dBz/dt is negative. The southward component of the magnetic field generated by an enhancement of the ring current produces similar effects everywhere inside this ring current loop.
dc.languageeng
dc.titleThe influence of a southward and northward turning of the interplanetary magnetic field on the geomagnetic cut-off of cosmic rays, on the mirror points positions of geomagnetically trapped particles, and on their rate of precipitations in the atmosphere
dc.typeArticle
dc.subject.frascatiPhysical sciences
dc.audienceScientific
dc.subject.freeCharged particles
dc.subject.freeCosmic rays
dc.subject.freeGeomagnetism
dc.subject.freeMagnetosphere
dc.subject.freeMirrors
dc.subject.freePlanets
dc.subject.freePrecipitation (meteorology)
dc.subject.freeEquitorial distances
dc.subject.freeGeomagnetic fields
dc.subject.freeInterplanetary magnetic fields (IMF)
dc.subject.freeMagnetospheric processes
dc.subject.freeMagnetic field effects
dc.subject.freemagnetic field
dc.source.titleJournal of Atmospheric and Solar-Terrestrial Physics
dc.source.volume67
dc.source.issue7
dc.source.page719-727
Orfeo.peerreviewedYes
dc.identifier.doi10.1016/j.jastp.2004.09.008
dc.identifier.scopus2-s2.0-17444366131


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