Relations between the equatorial vertical drifsts, electrojet, GPS-TEC and scintillation during the 2008-09 Solar Minimum

Relations between the equatorial vertical drifsts, electrojet, GPS-TEC and scintillation during the 2008-09 Solar Minimum

Sovit M. Khadka1,2, Cesar Valladares2, Rezy Pradipta2, Edgardo Pacheco3, and Percy Condor3

 1Physics Department, Boston College, Chestnut Hill, Massachusetts, USA,2Institute for Scientific Research, Boston College,Newton, Massachusetts, USA,3Radio Observatorio de Jicamarca, Instituto Geofísico del Perú, Lima, Peru


Correspondence to:

S. M. Khadka
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Key Points:



Abstract:

Over an extensive period of time, tremendous amount of scientific effort has been committed to the forecasting of equatorial ionospheric scintillations. This study delineates the interrelationship between the equatorial vertical ExB drift, Equatorial Electrojet (EEJ) strength, Global Positioning System (GPS)-derived total electron content (TEC) and postsunset scintillation from ground observations with the aim of finding reliable indications of the occurrence of ionospheric irregularities. Data from ground based observations such as magnetometers, ionosondes, GPS receivers and Incoherent Scatter Radars in the low latitudes of the American longitude sector were examined during the 2008-09 solar minimum. The difference between horizontal components (H) of the geomagnetic field (at and off by 6-9 degrees to dip equator) from a pair of magnetometers is a measure of EEJ strengths and this can be used to estimate vertical drifts. Ionosondes and radars data are expected to give a much more accurate measure of the vertical drifts. The electric field controlling EEJ and ExB drifts might determine whether we have favorable condition for the development of postsunset equatorial plasma bubble (EPB) and scintillations or not. The data show a strong relationship between the electric field and GPS-derived TEC. This presentation will also discuss the relationship between daytime equatorial vertical ExB drift and postsunset ionospheric scintillation.

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