Joint Ulysses and ACE observations of a magnetic cloud and the associated solar energetic particle event |
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| Authors: | Lario D Haggerty DK Roelof EC Tappin SJ Forsyth RJ Gosling JT |
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| Institution: | (1) Applied Physics Laboratory, Johns Hopkins University, Laurel, Maryland, U.S.A;(2) School of Physics and Space Research, University of Birmingham, U.K;(3) The Blackett Laboratory, Imperial College, London, U.K;(4) Los Alamos National Laboratory, Los Alamos, New Mexico, U.S.A |
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| Abstract: | On day 49 of 1999 a strong interplanetary shock was observed by the ACE spacecraft located at 1 AU from the Sun. This shock
was followed 10 hours later by a magnetic cloud (MC). A large solar energetic particle (SEP) event was observed in association
with the arrival of the shock and the MC at ACE. The Ulysses spacecraft, located at 22° S heliolatitude and nearly the same
ecliptic longitude as ACE, observed a large SEP event beginning on day 54 that peaked with the arrival of a solar wind and
magnetic field disturbance on day 61. A magnetic cloud was observed by Ulysses on days 63–64. We suggest a scenario in which both spacecraft intercepted the same MC, although sampling different regions
of it. We describe the effects that the MC produced on the streaming of energetic particles at both spacecraft.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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