Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jgra..11412308y&link_type=abstract
Journal of Geophysical Research, Volume 114, Issue A12, CiteID A12308
Physics
6
Ionosphere: Equatorial Ionosphere, Ionosphere: Electric Fields (2712), Ionosphere: Ionospheric Dynamics, Ionosphere: Ionospheric Irregularities, Ionosphere: Ionospheric Storms (7949)
Scientific paper
We have examined the quiet time equatorial electrodynamics of the ionosphere in the postmidnight sector using satellite, GPS total electron content (TEC) and ionosonde data. ROCSAT-1 vertical drift data are used to estimate the equatorial ionosphere electrodynamics, TOPEX altimeter and GPS TEC are used to obtain the density structure of the ionosphere. Ionosonde data measure the postmidnight F layer height as function of local time. We analyzed 4 years (2001-2004) of quiet time (Kp ≤ 3) observations in the postmidnight sector. We found that very strong equatorial ionospheric anomalies (EIAs) in the postmidnight (0100-0500 LT) sector during magnetically quiet periods are common and are capable of disrupting satellite communication and navigation systems. The coordinated multi-instrument observations clearly demonstrate that these strong EIAs are not simply the EIAs observed in earlier local time sectors that have corotated into the postmidnight sector as has been suggested by previous studies. We demonstrate that they are triggered by a reversed vertically upward drift, which is suggested to be generated by thermospheric neutral wind through F region dynamo. This clearly demonstrates that the Earth's postmidnight ionosphere is dynamic even in magnetically quiet periods contrary to simple theoretical model predictions.
de Jesus Rodolfo
Moldwin Mark B.
Sahai Yogeshwar
Yizengaw Endawoke
No associations
LandOfFree
Strong postmidnight equatorial ionospheric anomaly observations during magnetically quiet periods 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 Strong postmidnight equatorial ionospheric anomaly observations during magnetically quiet periods, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Strong postmidnight equatorial ionospheric anomaly observations during magnetically quiet periods will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1696990