Determination of Solar Source Regions of the Solar Wind Sampled by Ulysses and ACE Near Solar Activity Maximum

Details Determination of Solar Source Regions of the Solar Wind Sampled by Ulysses and ACE Near Solar Activity Maximum Determination of Solar Source Regions of the Solar Wind Sampled by Ulysses and ACE Near Solar Activity Maximum

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh61b03n&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SH61B-03

Physics

2100 Interplanetary Physics, 2164 Solar Wind Plasma, 2169 Sources Of The Solar Wind

Scientific paper

Recent observations at high solar latitudes by the Ulysses spacecraft provide information on the 3-D structure of the solar wind near the maximum of solar activity. High-latitude data from Ulysses and in-ecliptic data from ACE are mapped back to the solar surface using a 2-step process: (1) the speed measured at the spacecraft is used to map the solar wind back to a source surface at 2.5 solar radii assuming radial flow at constant speed, and (2) a potential field model calculated from the measured photospheric magnetic field completes the mapping to the solar surface. At low and mid-latitudes, this process provides good agreement between the measured polarity of the interplanetary magnetic field and the polarity of the solar source region to which the solar wind is mapped. The agreement is poor at latitudes poleward of ~60 deg, perhaps because of the degradation of photospheric magnetic-field observations in polar regions. The plasma data from Ulysses and ACE are compared for intervals that map to the same solar sources.

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