Modeling of Equatorial Anomaly Development and Collapse at Dusk Observed by TIMED/GUVI

Details Modeling of Equatorial Anomaly Development and Collapse at Dusk Observed by TIMED/GUVI Modeling of Equatorial Anomaly Development and Collapse at Dusk Observed by TIMED/GUVI

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh22a..03b&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SH22A-03

Astronomy and Astrophysics

Astrophysics

2100 Interplanetary Physics, 2400 Ionosphere (6929), 2700 Magnetospheric Physics (6939), 3300 Atmospheric Processes, 7500 Solar Physics, Astrophysics, And Astronomy

Scientific paper

The GUVI instrument on NASA's TIMED satellite acquires images of 135.6-nm emission in the Earth's ionosphere/thermosphere system. The brightness of the GUVI images is approximately proportional to the square of the electron density and, as such, the images can be used to monitor the equatorial F region ionization anomaly. The intensity and separation of these bands are controlled by the equatorial ExB drift and the meridional neutral wind. A morphological study over 18- months of GUVI disk data at dusk show that collapse of the equatorial anomaly occurs frequently in the Indian-African longitude sector during the June solstice. On the other hand, the anomaly collapse is a relatively rare occurrence in the Pacific sector during the June solstice. Since the collapse of the anomaly has been linked to the suppression of scintillations, this is an important finding consistent with known scintillation morphology. The SAMI3, another model of the ionosphere, is now being utilized to model the evening collapse of the anomaly in the various longitude sectors. It is very important to recognize that this aspect of equatorial space weather, namely the day-to-day variability of the scintillation phenomenon under quiet magnetic conditions, remains unresolved over several decades even though its understanding is of great importance for GPS-based navigation systems. We hope these modeling efforts will eventually lead to the isolation of a unique set of drivers that control large and small scale plasma structuring.

Affiliated with

Also associated with

No associations

Rating

Modeling of Equatorial Anomaly Development and Collapse at Dusk Observed by TIMED/GUVI 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 Modeling of Equatorial Anomaly Development and Collapse at Dusk Observed by TIMED/GUVI, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Modeling of Equatorial Anomaly Development and Collapse at Dusk Observed by TIMED/GUVI will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-967278