Physics
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsa14a..01n&link_type=abstract
American Geophysical Union, Spring Meeting 2009, abstract #SA14A-01
Physics
0310 Airglow And Aurora, 0328 Exosphere, 0355 Thermosphere: Composition And Chemistry, 3309 Climatology (1616, 1620, 3305, 4215, 8408)
Scientific paper
Hydrogen is a primary constituent of the geocorona and is a chemical byproduct of species below such as methane and water vapor, two greenhouse gases. The solar cycle is a dominant source of natural variability in this region and must be accounted for when isolating the effects of coupling processes from below, including that due to potential long-term change in the region. Observations by the Wisconsin H-alpha Mapper Fabry- Perot of geocoronal hydrogen Balmer-alpha emissions over solar cycle 23 have quantified a factor of 1.5 ± 0.15 higher intensities at solar maximum than at solar minimum. These observations are consistent with Fabry-Perot observations from Wisconsin during solar cycle 22. All observations have been consistently calibrated for intensity using the North American Nebula. We used the LYAO_RT radiative transfer code of Bishop to compare the observed Balmer-alpha intensities with intensities calculated using the hydrogen density distribution in the Mass-Spectrometer-Incoherent-Scatter (MSIS) model, a major empirical model used by the middle and upper atmospheric research communities. The MSIS distribution yields a solar maximum to minimum ratio similar to that observed; however, significant differences in magnitude between predicted and observed intensities highlight the need for improved upper atmospheric hydrogen density determinations.
Haffner Matthew L.
Mierkiewicz Edwin J.
Nossal Susan M.
Reynolds Ron J.
Roesler Fred L.
No associations
LandOfFree
Monitoring the Outer Region of the Neutral Atmosphere 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 Monitoring the Outer Region of the Neutral Atmosphere, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Monitoring the Outer Region of the Neutral Atmosphere will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1108358