Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh11a0367r&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SH11A-0367
Other
7509 Corona, 7514 Energetic Particles (2114), 7524 Magnetic Fields, 7846 Plasma Energization
Scientific paper
We used a combination of heliospheric and solar data to identify a set of open fields for which both the solar and near-Earth positions are known. The purpose is to test existing and developing models of magnetic field topology. The models are provided by other members of the Living With a Star Targeted Research & Technology Heliospheric Magnetic Field Focus Team. For our part, we concentrated on the solar phenomena associated with near-relativistic electron energization and transport, because near-relativistic electrons emit or excite many forms of detectable electromagnetic (EM) radiation. The EM radiations help us identify the solar end or `origin' of individual open field lines, and the near-Earth ends can be identified by their association with electron beam events at 1 AU, using the EPAM instrument on the ACE spacecraft. The total number of events that met our criteria for inclusion in the study is about 200. For each event, we used the measured solar wind speed to estimate the curvature of the field line, from which we could infer the Carrington longitude of the open field on the `source surface' at 2.5 solar radii. Potential field source surface calculations supplied by I.-M. Wang and N. R. Sheeley allowed us to trace the open fields from their intersection with the heliospheric field at 2.5 solar radii down to the base of the corona. Our study was specifically designed to test two contrasting open field models: (1) a model with widely distributed open fields and (2) a model with open fields only in well- defined coronal holes. We will present the preliminary results of the study and several case studies. This work was supported by NASA TR&T grant NNG05GM69G.
Haggerty Dennis K.
Rust David Maurice
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