Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm61a07l&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SM61A-07 INVITED
Physics
2724 Magnetopause, Cusp, And Boundary Layers
Scientific paper
During the interval 7-1300 on January 14, 2001, the four Cluster spacecraft traversed from the central lobe, through the dusk sector mantle region on their way towards the magnetopause along the 1500 MLT meridian. Throughout this interval, the EISCAT Svalbard radar at Longyearbyen observed a series of poleward-moving transient events, with a repetition period close to 10 min. The radar was deployed with one beam pointing along the magnetic field line and one at 30 degrees elevation along the magnetic meridian. Mapping the events seen moving polewards along the low-elevation beam back in time and latitude shows that early in the interval they formed equatorward of Longyearbyen and subsequently passed through the field-aligned beam, whereas towards the end of the interval they arose either between the radar beams or at a longitude nearer noon, such that no signatures were seen in the field aligned beam. The magnetic footprint of the Cluster craft, mapped using a Tsyganenko T89 model with input conditions prevailling during this event, circled around the low elevation beam and then were in close conjunction with the field aligned beam at 12:25. At 09:00 the DMSP F12 satellite flew over the ESR and showed a sawtooth cusp ion step signature (that also extended into the electrons on the equatorward edge of the cusp) and the EISCAT and SuperDARN radars and AMIE convection patterns show that the associated poleward-moving events convected over the predicted Cluster footprints. At this time Cluster was in the mantle and observed enhancements in the fluxes of both electrons and ions which, like the sawtooth cusp ion steps and the poleward-moving events, are consistent with reconnection pulses modulating the point at which the observed open field lines thread the magnetopause. Around the time of closest conjunction to the ESR, the Cluster craft observed transient entries into the low-latitude boundary layer, which were nested according to the distance from the craft to the nominal magnetopause location. Four-craft analysis shows that these events were convecting antisunward over the boundary. This motion is reflected in the spreading towards dusk of a magnetopause erosion signature seen in 630nm emissions from Svalbard and a perturbation in the flow patterns derived by the AMIE technique. The loss of energetic electrons in the events strongly suggests that the LLBL encountered in the transient events was open and the events, as seen by this wide variety of satellite and ground-based instruments, are consistent with transient thickenings of the LLBL caused by magnetopause reconnection pulses.
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