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A View of the Inner Heliosphere during the May 10-11, 1999 Low Density
Anomaly Arcadi V. Usmanov 1 (7-812-429-4633; usmanov@snoopy.phys.spbu.ru) W. M. Farrell 2 (301-286-4446; william.farrell@gsfc.nasa.gov) M. L. Goldstein 3 (301-286-7828; melvyn.goldstein@gsfc.nasa.gov) 1University of St.-Petersburg, Institute of Physics, St. Petersburg 198904, Russian Federation 2NASA Goddard Space Flight Center, Code 695, Greenbelt, MD 20771, United States 3NASA Goddard Space Flight Center, Code 692, Greenblet, MD 20771, United States On May 10 and 11, 1999, the particle experiments on the WIND spacecraft observed a substantial and significant solar wind density dropout, to well below 0.5 particles/cc. The solar wind measured at 1 AU during this unusual period was mapped back toward the Sun using two different methods: (a) using ballistic trajectories plus corotation, and (b) using MHD-derived magnetofluid parameters. Incorporating measurements made over an entire solar rotation, this inverse tracing creates a view of the inner heliosphere, thereby allowing for identification of the source location of the anomaly on the Sun, determination of the structure evolution, and identification of nearby interacting structures during their traversal toward Earth. We will present comparisons of the ballistic versus MHD results. Preliminary analysis suggests that the source location of the anomaly lies close to the heliospheric current sheet. We also present comparisons of the source with SOHO images. |
Meeting: 1999 AGU Fall Meeting Reference Number:3379 Membership Number: Contact Information: Student rate: Willing to chair a session: Meeting Section: Special Session: Index Terms: Theme: Material presented: Contributed Poster presentation requested: Scheduling request: |