Charge Exchange-Induced X-Ray Emission from Comet C/1999 S4 (LINEAR)-Reference-Cited by-同舟云学术

Charge Exchange-Induced X-Ray Emission from Comet C/1999 S4 (LINEAR)

Published:2001-05-18 Issue:5520 Volume:292 Page:1343-1348
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Lisse C. M.¹,Christian D. J.¹²,Dennerl K.³,Meech K. J.⁴,Petre R.⁵,Weaver H. A.⁶,Wolk S. J.⁷

Affiliation:

1. University of Maryland, Department of Astronomy, College Park, MD 20742, USA.

2. Computer Sciences Corporation, Science Operations, 3700 San Martin Drive, Baltimore, MD 21218, USA.

3. Max-Planck-Institut für Extraterrestrische Physik, Postfach 1603, 85740 Garching, Germany

4. Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA.

5. Code 666, NASA Goddard Spaceflight Center, Greenbelt, MD 20771, USA.

6. Johns Hopkins University, Department of Physics and Astronomy, 3400 North Charles Street, Baltimore, MD 21218, USA.

7. Chandra X-Ray Center, Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA.

Abstract

Using soft x-ray observations of the bright new comet C/1999 S4 (LINEAR) with the Chandra x-ray observatory, we have detected x-ray line emission created by charge exchange between highly ionized solar wind minor ions and neutral gases in the comet's coma. The emission morphology was symmetrically crescent shaped and extended out to 300,000 kilometers from the nucleus. The emission spectrum contains 6 lines at 320, 400, 490, 560, 600, and 670 electron volts, attributable to electron capture and radiative deexcitation by the solar wind species C +5 , C +6 , N +7 , O +7 , and O +8 . A contemporaneous 7-day soft x-ray light curve obtained using the Extreme Ultraviolet Explorer demonstrates a large increase in the comet's emission coincident with a strong solar flare on 14 and 15 July 2000.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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