Physics
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012jastp..74..136m&link_type=abstract
Journal of Atmospheric and Solar-Terrestrial Physics, Volume 74, p. 136-144.
Physics
Scientific paper
The equatorial plasma bubbles (EPBs) have been studied using slant total electron content (sTEC) derived from GPS data. The sTEC has been calculated from data measured at 15 International GNSS Service (IGS) stations located from 90°W to 30°W, covering the ionospheric equatorial anomaly at the American sector, for the years 2000, 2001, 2004, 2005 and 2008. The Ionospheric Bubbles Seeker (IBS) application has been used to detect and characterize the sTEC depletions associated to the EPBs. This technique bases its analysis on the time-variation of the sTEC and the population variance of this time-variation. The default configuration has been used and an EPB has been considered when a sTEC depletion was greater than 5 TEC units (TECu). The hourly occurrence shows the well-known maximum number of depletions after the post-sunset. The monthly occurrence of the EPBs is also analyzed and compared with previous studies. The International Reference Ionosphere model (IRI) has been used to calculate the equatorial vertical drift (EVD) and the peak densities of the E- and F-layers (NmE and NmF2, respectively). The EVD variation has been compared with the seasonal variation of the EPB. A discussion between the yearly mean occurrence EPBs rate and the solar activity is included. The variation of the yearly mean depth and duration of the sTEC depletions with the solar activity conditions and its relation with the ionospheric characteristics given by the IRI model has been also studied.
de La Morena Benito A.
Herraiz Miguel
Magdaleno S.
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