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Published December 2001 | Published
Journal Article Open

ACE Observations of The Bastille Day 2000 Interplanetary Disturbances


We present ACE observations for the six-day period encompassing the Bastille Day 2000 solar activity. A high level of transient activity at 1 AU, including ICME-driven shocks, magnetic clouds, shock-accelerated energetic particle populations, and solar energetic ions and electrons, are described. We present thermal ion composition signatures for ICMEs and magnetic clouds from which we derive electron temperatures at the source of the disturbances and we describe additional enhancements in some ion species that are clearly related to the transient source. We describe shock acceleration of 0.3–2.0 MeV nucl^(−1) protons and minor ions and the relative inability of some of the shocks to accelerate significant energetic ion populations near 1 AU. We report the characteristics of <20 MeV nucl^(−1) solar energetic ions and <0.32 MeV electrons and attempt to relate the release of energetic electrons to particular source regions.

Additional Information

© 2001 Kluwer Academic Publishers. Accepted 3 July 2001. This work was made possible by NASA through its continued support of the ACE spacecraft team. Work at the University of Delaware was supported by CIT subcontract PC251439 under NASA grant NAG5-6912 for support of the ACE magnetic field experiment. Work at Los Alamos was performed under the auspices of the U.S. Department of Energy with financial support from the NASA ACE program. The University of Michigan work was supported, in part, by NASA contracts NAG5-2810 and NAG5-7111. Work at JHU/APL was supported by NASA contract NAG5-92721. Work at the University of Maryland was supported by NASA contract NAS5-30927 and grant NAG5-7228 and NASA grant PC251428. Work at UNH was supported by NASA contract NAG5-6912. Work at the California Institute of Technology was supported by NASA under grant NAS5-6912.

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