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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;
W. M. Farrell 2 (301-286-4446;
M. L. Goldstein 3 (301-286-7828;

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.
1999 AGU Fall Meeting

Reference Number:3379

Membership Number:
W. M. Farrell
AGU - 06639116

Contact Information:
W. M. Farrell
NASA Goddard Space Flight Center Code 695
Greenbelt, MD 20771, United States
ph : 301-286-4446
fax : 301-286-1683
e-mail :

Student rate:
Not Applicable

Willing to chair a session:
M. L. Goldstein

Meeting Section:
SM - SPA-Magnetospheric Physics

Special Session:
SM04 - Solar-Terrestrial Interactions on the Day the Solar Wind Almost Disappeared (Joint With SA and SH)

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