Comparison of Auroral and Inner CPS in situ Measurements During an Expansive Phase Onset

Details Comparison of Auroral and Inner CPS in situ Measurements During an Expansive Phase Onset Comparison of Auroral and Inner CPS in situ Measurements During an Expansive Phase Onset

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm14a..03d&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM14A-03

Physics

2716 Energetic Particles: Precipitating, 2730 Magnetosphere: Inner, 2744 Magnetotail, 2764 Plasma Sheet, 2790 Substorms

Scientific paper

On March 13, 2007, there was a sequence of auroral and contemporaneous magnetotail activity that occurred during a period when the THEMIS constellation was in the evening sector inner CPS. The satellites were magnetically conjugate to the auroral zone in western Canada. The viewing conditions over numerous All-Sky Imagers (ASIs) in Canada were excellent. Although the THEMIS satellites were still in commissioning phase, the fluxgate magnetometers (FGM) were operating on all five satellites during this event, as was the electrostatic analyzer instrument on THEMIS A. As well, three GOES satellites were collecting geosynchronous magnetic field data over Canada throughout the event. Preliminary analysis shows the following. There was an onset at roughly 0508 UT either at or earthward of the position of THEMIS D (just beyond geosynchronous distance), and then propagated outwards over THEMIS B, A, and E in turn. This appears as an outwardly propagating decrease in cross-tail current as inferred from FGM; however, the current sheet in the vicinity of THEMIS E was increasing in strength and/or thinning while the onset was already in progress closer to the Earth. ASI, meridian scanning photometer, and riometer data show that the onset occurs in the same meridian as the THEMIS spacecraft, and allow us to identify the ionospheric signatures of the dispersionless injection and the earthward edge of the ion plasma sheet. Our conclusions based on this preliminary study are as follows: 1) the 0508 UT onset occurred near geosynchronous orbit and was not preceded by a fast earthward flow; 2) growth phase continued further from the Earth on probes to the East of the onset meridian; 3) the optical onset, dispersionless injection (from riometers), and local decrease in cross tail current all happened at the same time; 4) inter-comparison of ground- based and in situ observations highlight the importance of the coordinated use of ground and satellite data for overcoming azimuthal and radial magnetic projection uncertainties.

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