Physics
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aipc..382..622f&link_type=abstract
Proceedings of the eigth international solar wind conference: Solar wind eight. AIP Conference Proceedings, Volume 382, pp. 622
Physics
1
Interplanetary Dust And Gas, Atomic Excitation And Ionization By Electron Impact, Planetary Bow Shocks, Interplanetary Shocks
Scientific paper
Solar wind plasma data measured during the near-ecliptic phase of the Ulysses mission between October, 1990 and January, 1993 were studied to determine the relative importance of electron-impact ionization to the total ionization rates of interstellar hydrogen and helium atoms. During times of quiet flow conditions electron-impact ionization rates were found to be generally low, of the order of 1% of the total ionization rates. However, just downstream of the strongest CME- and CIR-driven shock waves encountered by Ulysses, the electron impact-ionization rate at times was more than 10% that of the charge-exchange rate for hydrogen and more than 100% that of the photoionization rate for helium.
Feldman William C.
Gosling Jack T.
Isenberg Philip A.
Phillips John Lynch
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