Chandra Observations of Soft X-ray Emissions from Earth and Jupiter

Details Chandra Observations of Soft X-ray Emissions from Earth and Jupiter Chandra Observations of Soft X-ray Emissions from Earth and Jupiter

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm24a..04g&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM24A-04

Other

2704 Auroral Phenomena (2407), 0310 Airglow And Aurora

Scientific paper

Earth was observed using the High-Resolution Camera (HRC-I) aboard the Chandra X-Ray Observatory at 10 epochs between mid-December 2003 and mid-April 2004. Each observation was ˜20~minutes in duration, with fixed pointing so that the north polar cusp was allowed to drift through the HRC-I field-of-view (30'×30', or about 1150×1150~km2 at the Earth as seen from Chandra apogee). The observations were performed during northern winter, so that the northern auroral region was mostly dark and fluoresced solar x-ray contamination could be avoided. The investigation was designed to compare Earth's soft x-ray auroral emissions with previous Chandra observations of Jupiter's x-ray aurora, where a pulsating x-ray "hot-spot" near the northern magnetic pole was observed which indicated a possible source due to the entry of heavy solar wind ions into the jovian cusp. The first Chandra soft (0.1-5 keV) x-ray observations of Earth's aurora show that it is highly variable (intense arcs, multiple arcs, diffuse patches, at times absent). In at least one of the observations an isolated blob of emission was seen in the expected cusp location. A fortuitously-timed overflight of a DMSP satellite (F13) provided SSJ4 particle measurements which indicate that at least one of the bright arcs we observed is produced by electron bremsstrahlung. Other preliminary results from these unique Chandra observations of Earth will be presented and discussed.

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