Coordinated Energetic Particle Measurements Using Chandra, Cluster, and Polar

Details Coordinated Energetic Particle Measurements Using Chandra, Cluster, and Polar Coordinated Energetic Particle Measurements Using Chandra, Cluster, and Polar

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm51e..02m&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM51E-02

Other

7807 Charged Particle Motion And Acceleration, 7835 Magnetic Reconnection

Scientific paper

It is not well known in the magnetospheric physics community that the Chandra spacecraft carries a multi-element energetic particle telescope called EPHIN (Electron Proton Helium Instrument) fielded by the University of Kiel. For present purposes we are interested in electrons that are measured from greater than 30 keV to greater than 10 MeV. Chandra is in a highly elliptical orbit with a perigee of 16000 km, and apogee of 133,000 km and an inclination of 28 degrees. Fortuitously the line of apsides is relatively close to that of the Cluster constellation. A first use of the Chandra data has been a further examination of a substorm onset that occurred = 0408 UT on 27 August 2001, discussed in a publication by Baker et al. (2002). At that time the s/c coordinates in GSM were Chandra (-6.64, 16.15, 12.82); Cluster 3 (-19.15, -1.40, 1.54); Polar (-7.71, -4.50, 3.32). It can be seen that whereas Cluster and Polar were a bit post midnight and roughly radially aligned, Chandra was well pre-midnight at around 20 hrs. Yet the onset time of energetic electrons at Chandra was very close to that observed at Cluster and Polar. Furthermore, some pre-substorm bursts were also seen to be closely time coincident at Chandra and the other spacecraft. These observations give additional evidence about the scale size of the phenomena and will be discussed in detail along with other coordinated measurements. Baker et al. GRL 29, no. 24, 2190, 2002

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