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The Heliosphere in the Local Interstellar Medium - Proceedings of the First ISSI Workshop 6-10 November 1995, Bern, Switzerland (Paperback, Softcover reprint of the original 1st ed. 1996)
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The Heliosphere in the Local Interstellar Medium - Proceedings of the First ISSI Workshop 6-10 November 1995, Bern, Switzerland (Paperback, Softcover reprint of the original 1st ed. 1996)
Series: Space Sciences Series of ISSI, 1
Expected to ship within 10 - 15 working days
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In summary, we can conclude that the contributions of the different
ionization processes to the total ionization rate for the most
abundant interstellar species are basically known. The ionization
of the noble gases He and Ne is almost completely dominated by
photoionization, whereas for H charge-exchange with the solar wind
is most important. For other species, such as 0 and Ar, both
processes contribute significantly. Electron impact ionization can
typically contribute by '" 10% to the total rate in the inner Solar
System. Because direct measurements of the solar EUV flux are not
yet continuously available, the variation of the ionization rate
over the solar cycle still contains a relatively large uncertainty.
The recent measurements of pickup ion distributions and of the
neutral helium gas provide an independent tool to determine the
total ionization rate that can be used to cross calibrate with the
results obtained for the individual ionization processes.
Acknowledgements The authors are grateful to M. Allen for supplying
us with new data on photoioniza tion cross-sections compiled by
him. We thank also M. Gruntman for drawing our attention to and
support in collecting the most recent data on charge-exchange
cross-sections. D. R. was supported by grant No. 2 P03C. 004. 09
from the Com mittee for Scientific Research (Poland). This work was
also supported in part through NASA contract NAS7-918, NSF Grant
INT-911637, NASA Grant NAGW- 2579.
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