Modeling of cometary x-rays caused by solar wind minor ions

Science

Volumn 276, Issue 5314, 1997, Pages 939-942

  Häberli, Roman M ^a   Gombosi, Tamas I ^a   De Zeeuw, Darren L ^a   Combi, Michael R ^a   Powell, Kenneth G ^a  

^a UNIVERSITY OF MICHIGAN   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

ARTICLE; ASTRONOMY; PRIORITY JOURNAL; RADIATION; RADIATION DETECTION; X RAY;

CARBON; COMPUTER SIMULATION; EXTRATERRESTRIAL ENVIRONMENT; HYDROGEN; IONS; METEOROIDS; NEON; OXYGEN; X-RAYS;

EID: 0030976795     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.276.5314.939     Document Type: Article

References (31)

1. C. M. Lisse et al., Science 274, 205 (1996).
2. T. E. Cravens, Geophys. Res. Lett. 24, 105 (1997).
3. H. J. Waite Jr. et al., J. Geophys. Res. 99, 14799 (1994); T. E. Cravens, E. Howell, J. H. Waite Jr., G. R. Gladstone, ibid. 100, 17153 (1995).
4. H. J. Waite Jr. et al., J. Geophys. Res. 99, 14799 (1994); T. E. Cravens, E. Howell, J. H. Waite Jr., G. R. Gladstone, ibid. 100, 17153 (1995).
5. R. Mann, F. Folkmann, H. F. Beyer, J. Phys. B At. Mol. Phys. 14, 1161 (1981); D. Dijkkamp, Yu. S. Gordeev, A. Brazuk, A. G. Drentie, F. J. de Heer, ibid. 18, 737 (1985).
6. R. Mann, F. Folkmann, H. F. Beyer, J. Phys. B At. Mol. Phys. 14, 1161 (1981); D. Dijkkamp, Yu. S. Gordeev, A. Brazuk, A. G. Drentie, F. J. de Heer, ibid. 18, 737 (1985).
7. R. C. Isler, Plasma Phys. Control. Fusion 36, 171 (1994).
8. + [R. M. Häberli, M. R. Combi, T. I. Gombosi, D. L. De Zeeuw, K. G. Powell, Bull. Am. Astron. Soc. 28, 1085 (1996)].
9. + [R. M. Häberli, M. R. Combi, T. I. Gombosi, D. L. De Zeeuw, K. G. Powell, Bull. Am. Astron. Soc. 28, 1085 (1996)].
10. D. De Zeeuw and K. G. Powell, J. Comp. Phys. 104, 56 (1993).
11. 2O accounts for 80% of the total gas production [ D. Krankowsky ef al., Nature 321, 326 (1986)].
12. 2O accounts for 80% of the total gas production [ D. Krankowsky ef al., Nature 321, 326 (1986)].
13. 2O accounts for 80% of the total gas production [ D. Krankowsky ef al., Nature 321, 326 (1986)].
14. z = 0 nT.
15. R. A. Phaneuf, I. Alvarez, F. W. Meyer, D. H. Crandall, Phys. Rev. A 26, 1892 (1982).
16. H. Tawara, At. Data Nucl. Data Tables 22, 491 (1978).
17. L. Haser, Bull. Acad. R. Belg. Classes Sci. Ser. 5 43, 740 (1957).
18. M. R. Combi, Icarus 123, 207 (1996).
19. R. E. Olson, J. Phys. B At. Mol. Opt. Phys. 13, 483 (1980).
20. R. E. Olson and D. R. Schultz, Phys. Scripta T 28, 71 (1989).
21. The expected count rates for the ROSAT instruments have been calculated for a geocentric distance of 0.127 AU using the energy-dependent effective area of the instruments as published in the ROSAT user's manual (http://ftp.rosat.mpe-garch-ing/mpg.de/). The degradation of the WFC sensitivity with time after launch has been taken into account.
22. The solar wind composition and charge state distribution of ions vary considerably with time [for example, R. von Steiger, S. P. Christon, G. Gloeckler, F. M. Ipavich, Astrophys. J. 389, 791 (1992)]. CXE cross sections have errors of 20 to 30%. The measured gas production rate and solar wind parameters have errors of 10 to 20%. Other ions, such as N, Si, and F, have not yet been included.
23. The O/H ratios are from S. J. Bame, J. R. Asbridge, W. C. Feldman, M. D. Montgomery, and P. D. Kearney [Sol. Phys. 43, 463 (1975)]. The C/O ratios are from (23). The Ne/O ratios are from J. Geiss, R. von Steiger, G. Gloeckler, and A. B. Galvin [Eos 75 (no. 16), 278 (1994)].
24. The O/H ratios are from S. J. Bame, J. R. Asbridge, W. C. Feldman, M. D. Montgomery, and P. D. Kearney [Sol. Phys. 43, 463 (1975)]. The C/O ratios are from (23). The Ne/O ratios are from J. Geiss, R. von Steiger, G. Gloeckler, and A. B. Galvin [Eos 75 (no. 16), 278 (1994)].
25. C. Lisse et al., http://www.astro.umd.edu/~lisse/ rosat.html.
26. R. Bingham, J. M. Dawson, V. D. Shapiro, D. A. Mendis, B. J. Kellett, Science 275, 49 (1996).
27. V. A. Krasnopolsky, Bull. Am. Astron. Soc. 28, 1095 (1996).
28. T. G. Northrop, C. M. Lisse, M. J. Mumma, M. D. Desch, Icarus, in press.
29. P. Bochsler, J. Geiss, S. Kunz, Sol. Phys. 103, 177 (1986).
30. R. L. Kelly and L. J. Palumbo, Atomic and lonic Emission Lines Below 2000 Angstroms (Naval Research Laboratory, Washington, DC, 1973).
31. This work was supported by NASA under grants NAGW-1907, NAGW-1366, and NCCS5-146 and by NSF under grants AS7-9618795 and ATM-9318181 R.M.H. acknowledges partial support by the Swiss National Science Foundation. We thank T. E. Cravens for helpful discussions.