Physics
Scientific paper
Aug 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jgra..11008308h&link_type=abstract
Journal of Geophysical Research, Volume 110, Issue A8, CiteID A08308
Physics
7
Ionosphere: Equatorial Ionosphere, Ionosphere: Ionospheric Irregularities, Ionosphere: Ionosphere/Atmosphere Interactions (0335), Ionosphere: Instruments And Techniques
Scientific paper
We present a method for measuring equatorial anomaly (EA) morphology using nighttime 135.6 nm radiance observed by the Global Ultraviolet Imager (GUVI) on board the Thermosphere Ionosphere Mesosphere Energetics and Dynamics (TIMED) spacecraft. The method uses the singular value decomposition to estimate an along-track intensity profile as TIMED passes over the EA. The method is unique in that it removes intensity depletions due to equatorial plasma bubbles (EPBs) from the estimated intensity profile. Thus the profiles reflect plasma distribution in response to equatorial E × B drifts and neutral winds. A set of metrics including crest maximum intensity and its latitude are extracted from the intensity profiles. EPBs are also detected. Preliminary results from this method using GUVI equinox data from 2002 are compared with results from a ground-based ionosonde EA morphology study by Whalen (2001) in the western American sector. EPB occurrence rates are also compared with results from Huang et al. (2001), who used DMSP in situ density measurements to detect EPBs. General agreement was found in both studies with some localized differences. These results indicate that this method provides a valuable means of simultaneously studying EA morphology and EPB occurrence rates. Since the TIMED spacecraft precesses through all local times in 60 days, this method can be used to extend ground-based measurements to study the global relationship between E × B drifts and plasma distribution in the EA and how these relate to the occurrence of large-scale EPBs.
Christensen Andrew B.
Gunther J. H.
Henderson Barry S.
Paxton Larry J.
Swenson Charles Merrill
No associations
LandOfFree
Method for characterization of the equatorial anomaly using image subspace analysis of Global Ultraviolet Imager data 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 Method for characterization of the equatorial anomaly using image subspace analysis of Global Ultraviolet Imager data, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for characterization of the equatorial anomaly using image subspace analysis of Global Ultraviolet Imager data will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-855931