Equatorial electrodynamics and neutral background in the Asian sector during the 2009 stratospheric sudden warming

Details Equatorial electrodynamics and neutral background in the Asian sector during the 2009 stratospheric sudden warming Equatorial electrodynamics and neutral background in the Asian sector during the 2009 stratospheric sudden warming

Aug 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jgra..11608308l&link_type=abstract

Journal of Geophysical Research, Volume 116, Issue A8, CiteID A08308

Physics

7

Atmospheric Composition And Structure: Thermosphere: Energy Deposition (3369), Ionosphere: Ionosphere/Atmosphere Interactions (0335), Ionosphere: Ionospheric Disturbances, Ionosphere: Ionospheric Dynamics

Scientific paper

Using ground observations of total electron content (TEC) and equatorial electrojet (EEJ) in the Asian sector, along with plasma and neutral densities obtained from the CHAMP satellite, we investigate the ionospheric electrodynamics and neutral background in this longitude sector during the major stratospheric sudden warming (SSW) in January 2009. Our analysis reveals the following prominent features. First, the TEC response in tropical regions is strongly latitude dependent, with monotonic depletion at the dip equator but a semidiurnal perturbation at low latitudes. Second, the TEC semidiurnal perturbation possesses a significant hemispheric asymmetry in terms of onset date and magnitude. It starts on the same day as the SSW peak in the Northern Hemisphere but 2 days later in the Southern Hemisphere. Its magnitude is twice as strong in the north than in the south. Third, strong counter electrojet occurs in the afternoon, following the strengthening of the eastward EEJ in the morning. Fourth, semidiurnal perturbation in both TEC and EEJ possesses a phase shift, at a rate of about 0.7 h/day. Comparisons with results reported in the Peruvian sector reveal clear longitude dependence in the amplitude and hemispheric asymmetry of the semidiurnal perturbation. Finally, thermospheric density undergoes ˜25% decrease at low latitudes in the afternoon local time sector during the SSW, indicating significant cooling effects in the tropical upper thermosphere.

Affiliated with

Also associated with

No associations

Rating

Equatorial electrodynamics and neutral background in the Asian sector during the 2009 stratospheric sudden warming 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 Equatorial electrodynamics and neutral background in the Asian sector during the 2009 stratospheric sudden warming, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Equatorial electrodynamics and neutral background in the Asian sector during the 2009 stratospheric sudden warming will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1681270