a Search for Soft X-Ray Auroras on Earth

Physics

Scientific paper

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Chandra Proposal Id #03108123

Scientific paper

Chandra HRC-I observations of Jupiter made in Dec. 2000 in support of the Cassini flyby have revealed the surprising result that jovian auroral x-ray emissions are concentrated in a small `hot spot' which pulsates with a ~45-m period. The location of the hot spot near the magnetic pole implies a particle source region near Jupiter's magnetopause, and high-latitude reconnection of heavy solar wind ions is now a viable explanation for these soft x-ray emissions. The identical process should operate at Earth as well. Hard x-ray emissions from electron bremsstrahlung are well known in the terrestrial aurora. Surprisingly, however, there have been no searches of Earth's aurora for emissions at <2keV. We propose here a simple slew observation by HRC-I across the auroral region to look for Earth's soft x-ray aurora. The detection of a Jupiter-like hot spot at Earth would imply that heavy ion solar wind charge exchange is important for producing x-rays at planets as well as comets.

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