ELECTRON-IMPACT IONIZATION OF INTERSTELLAR HYDROGEN AND HELIUM AT INTERPLANETARY SHOCKS

被引：10
作者：
ISENBERG, PA
FELDMAN, WC
机构：
[1] UNIV NEW HAMPSHIRE,DEPT PHYS,DURHAM,NH 03824
[2] LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545
来源：
GEOPHYSICAL RESEARCH LETTERS | 1995年 / 22卷 / 08期
关键词：
D O I：
10.1029/95GL00703
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
We investigate the ionization of interstellar hydrogen and helium due to electron impact by shock-heated electrons. Taking the electron distributions measured at four interplanetary shocks at 1 AU, we show that the electrons in the downstream region of strong shocks can ionize interstellar atoms at rates matching or exceeding the nominal photoionization or charge-exchange rates. We suggest that this process may explain some puzzling observations of interstellar pickup ions made by the Ulysses spacecraft.
引用
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页码：873 / 875
页数：3
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