Other
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh31b05s&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SH31B-05
Other
0654 Plasmas, 2144 Interstellar Gas, 2151 Neutral Particles, 2152 Pickup Ions, 2164 Solar Wind Plasma
Scientific paper
Recently, systematic deviations of the He pickup ion cut-off energy from its nominal value at twice the solar wind speed that are related to the interstellar gas flow have been found in observations with the SOHO CELIAS instrument. Using the variation of the cut-off with the location along the Earth's orbit with respect to the interstellar flow provides another method to determine the inflow velocity of neutral interstellar He. Qualitative agreement has been found with these observations by simply adding the neutral velocity to the cut-off speed. However, it is noted that the neutral He velocity varies with its distance from the sun due to the gravitational attraction. Therefore, a simple velocity shift does not describe the effect on the pickup ion distribution correctly. Portions of the distribution that are picked up closer to the sun are affected more strongly than those picked up closer to the Earth. We will discuss a model that includes evaluation of the entire neutral gas distribution and the variation of the bulk velocity as a function of distance from the sun. The model results are compared with the shape of the pickup ion spectra as observed with SOHO CELIAS. In our discussion we will separate the slow and predictable variation of the neutral dis-tribution along the orbit from other faster time variations of the pickup ion distributions that are seen with SOHO CELIAS, and discuss possible ramifications.
Bzowski Maciej
Gruenwaldt H.
Klecker Berndt
Litvinenko Yuri
Moebius Eberhard
No associations
LandOfFree
Study of Interstellar Neutral Velocity Effects on Helium Pickup Ion Spectra as Observed with SOHO CELIAS does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Study of Interstellar Neutral Velocity Effects on Helium Pickup Ion Spectra as Observed with SOHO CELIAS, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Study of Interstellar Neutral Velocity Effects on Helium Pickup Ion Spectra as Observed with SOHO CELIAS will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1274426