Measurement of charge exchange and X-ray emission cross sections for solar wind-comet interactions

被引：75

作者：

Greenwood, JB ^{[1
]}

Williams, ID

Smith, SJ

Chutjian, A

机构：

[1] Queens Univ Belfast, Dept Phys, Belfast BT7 1NN, Antrim, North Ireland

[2] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA

来源：

ASTROPHYSICAL JOURNAL | 2000年 / 533卷 / 02期

基金：

美国国家航空航天局; 英国工程与自然科学研究理事会;

关键词：

atomic processes; comets : general; X-rays : general;

D O I：

10.1086/312615

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

X-ray emission from a comet was observed for the first time in 1996. One of the mechanisms believed to be contributing to this surprisingly strong emission is the interaction of highly charged solar wind ions with cometary gases. Reported herein are total absolute charge-exchange and normalized line-emission (X-ray) cross sections for collisions of high-charge state (+3 to +10) C, N, O, and Ne ions with the cometary species H(2)O and CO(2). It is found that in several cases the double charge-exchange cross sections can be large, and in the case of C(3+) they are equal to those for single charge exchange. Present results are compared to cross section values used in recent comet models. The importance of applying accurate cross sections, including double charge exchange, to obtain absolute line-emission intensities is emphasized.

引用

页码：L175 / L178

页数：4

共 19 条

[1]

[Anonymous], ATOMIC TRANSITION PR

[2]

BAME SJ, 1972, NASA308 SPEC PUBL, P535

[3]

BOSCHLER P, 1987, PHYSICA SCRIPTA T, V18, P55

[4]

Chutjian A, 1999, AIP CONF PROC, V475, P881

[5] Comet Hyakutake x-ray source: Charge transfer of solar wind heavy ions [J].

Cravens, TE .

GEOPHYSICAL RESEARCH LETTERS, 1997, 24 (01) :105-108

[6] X-ray emissions from comets detected in the Rontgen x-ray satellite all-sky survey [J].

Dennerl, K ;

Englhauser, J ;

Trumper, J .

SCIENCE, 1997, 277 (5332) :1625-1630

[7] SELECTIVE SINGLE-ELECTRON CAPTURE INTO (N,L) SUBSHELLS IN SLOW COLLISIONS OF C-6+, N-6+, O-6+ AND NE-6+ WITH HE, H-2 AND AR [J].

DIJKKAMP, D ;

GORDEEV, YS ;

BRAZUK, A ;

DRENTJE, AG ;

DEHEER, FJ .

JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, 1985, 18 (04) :737-756

[8] OBSERVATIONS OF SOLAR-WIND ION CHARGE-EXCHANGE IN THE COMET HALLEY COMA [J].

FUSELIER, SA ;

SHELLEY, EG ;

GOLDSTEIN, BE ;

GOLDSTEIN, R ;

NEUGEBAUER, M ;

IP, WH ;

BALSIGER, H ;

REME, H .

ASTROPHYSICAL JOURNAL, 1991, 379 (02) :734-740

[9] Measurements of absolute, single charge-exchange cross sections of H+, He+ and He2+ with H2O and CO2 [J].

Greenwood, JB ;

Chutjian, A ;

Smith, SJ .

ASTROPHYSICAL JOURNAL, 2000, 529 (01) :605-609

[10] Modeling of cometary X-rays caused by solar wind minor ions [J].

Haberli, RM ;

Gombosi, TI ;

DeZeeuw, DL ;

Combi, MR ;

Powell, KG .

SCIENCE, 1997, 276 (5314) :939-942

← 1 2 →