Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh62a04p&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SH62A-04
Physics
2111 Ejecta, Driver Gases, And Magnetic Clouds, 2164 Solar Wind Plasma, 7513 Coronal Mass Ejections
Scientific paper
Between days 175 and 180 of 1999, the PLS instrument on Voyager~2 observed alpha particle enhancements with fractional percentages of alpha to proton number densities exceeding 10%. Ulysses (located at 5.3~AU) observed at least two candidate source features for these enhancements. To identify the correct source structure, a 1D MHD model was used to propagate the Ulysses plasma data to the Voyager radial position (58.2~AU). An ICME-related alpha enhancement observed by Ulysses beginning on day 331, 1998 appears to be the correct feature. While a speed jump and cosmic ray decreases were observed by Ulysses in conjunction with this alpha enhancement, the timing of these features differed markedly at Voyager~2. The speed jump arrival-time difference is due to the faster propagation of the shock relative to the rest of the ejecta. It is unclear what mechanism is responsible for the delay in the cosmic ray decrease. Nevertheless, we have demonstrated that alpha enhancement signatures of ICMEs can be used to track these features to heliospheric distances of over 50~AU.
Heber Bernd
Paularena Karolen I.
von Steiger Rudolf
Wang Chenjie
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