Mathematics – Logic
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa51d1657c&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SA51D-1657
Mathematics
Logic
[2467] Ionosphere / Plasma Temperature And Density, [2481] Ionosphere / Topside Ionosphere
Scientific paper
Average ion parameters have been constructed with measurements from the Ionospheric Plasma and Electrodynamics Instrument (IPEI) onboard the first satellite of Republic of China, ROCSAT-1, orbiting at 600 km altitude with a 35o inclination during 1999-2004. Quiet-time ion temperature distributions in the nighttime sector are investigated for different local times and seasons during the solar maximum year of 2000. In comparison with previous study [Venkatraman and Heelis, 2000] with Defense Meteorological Satellite Program (DMSP) satellite, similarities in global ion temperature patterns exist for different seasons even though the ROCSAT satellite had a lower orbit. At solstices temperature crests and troughs are located in the winter hemisphere and near the dip equator (close to summer hemisphere), respectively. Both maxima of the temperature crests and minima of the temperature troughs are located in a longitudinal region of negative magnetic declination (South Atlantic region) during the June solstice and in the longitudinal region of positive magnetic declination (North Pacific region) during the December solstice. Such variations have been attributed to adiabatic compressions and expansions caused by field-aligned ion flow patterns, which are also identified from the ROCSAT measurement. However, in our observations the temperature crests are greatly reduced after the 2200 LT but still exist in later hours. The temperature troughs last for all night. These could be resulted from the efficiency of adiabatic compression and expansion processes, which would be changed with O+-H+ transition height. The O+-H+ transition height could be verified by ROCSAT measurement and is expected to be lower at low- and mid-latitudes in the winter hemisphere but is higher at the dip equator. These signatures at 600 km altitude have been reproduced with the SAMI2 model and will be used to reveal physical mechanisms behind them.
Chao Chia-Chun
Su Shangguo
No associations
LandOfFree
Observation and Modeling of Nighttime Ion Temperature in the Low-latitude Topside Ionosphere 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 Observation and Modeling of Nighttime Ion Temperature in the Low-latitude Topside Ionosphere, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Observation and Modeling of Nighttime Ion Temperature in the Low-latitude Topside Ionosphere will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1506114