Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh21a0488p&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SH21A-0488
Physics
2151 Neutral Particles, 2164 Solar Wind Plasma
Scientific paper
The Ulysses GAS experiment has been obtaining full-sky Lyman alpha maps since launch in 1990. The maps can be used to assess the distribution of heliospheric neutral H. Since the major loss process for H atoms in the interstellar medium is charge exchange with solar wind protons near the sun, the H distribution provides information on the time-averaged solar wind flux and its latitudinal variations. For this study we have systematically varied the model parameter A that characterizes the latitudinal variations in H atom lifetime against charge exchange. A separate A parameter is used for each solar hemisphere (AN and AS). A grid search was conducted in AN and AS on the model for each Ulysses GAS Lyman-alpha map to optimize agreement with the data. We will report on the derived AN and AS values and their variations with time, and compare these with actual solar wind measurements from Ulysses SWOOPS to test the utility of Lyman alpha remote sensing as a way to monitor hemispheric differences in the Sun's solar wind output.
Ajello Joseph M.
McComas David John
Pryor Wayne R.
Witte Malte
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