Other
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh22b0755g&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SH22B-0755
Other
2144 Interstellar Gas, 7538 Solar Irradiance, 7549 Ultraviolet Emissions
Scientific paper
The VLISM neutral hydrogen density is still not well known even after three decades of deep space research and the existence of EUV and other diagnostic data obtained by Pioneer10/11 and Voyager 1/2 on board sensors. The EUV data interpretation has suffered because of inadequate neutral hydrogen-plasma models, difficulty of calculating the multiply scattered Lyman Alpha glow and calibration uncertainties. Recently all these difficulties have been significantly reduced. In the present work we use the latest state of the art supersonic VLISM neutral hydrogen-plasma and Monte Carlo radiative transfer model, incorporating neutral density, temperature , and velocity variations, actual solar line shape, Mihalas Case II redistribution function, Doppler and aberration effects. We will present the Monte Carlo simulations for a number of neutral hydrogen models, compare the results with the Pioneer 10 Lyman Alpha data and discuss the implications.
Gangopadhyay Pradip
Gruntman Mike
Holberg Jay
Izmodenov Vladislav V.
Judge Darrell L.
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