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Title of article :
E region electric fields at the dip equator and anomalous conductivity effects Original Research Article
Author/Authors :
C.M. Denardini، نويسنده , , H.C. Aveiro، نويسنده , , J.H.A. Sobral، نويسنده , , J.V. Bageston، نويسنده , , L.M. Guizelli، نويسنده , , L.C.A. Resende، نويسنده , , J. Moro، نويسنده ,
Issue Information :
دوهفته نامه با شماره پیاپی سال 2013
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Abstract :
Zonal and vertical electric fields were estimated at E region heights in the Brazilian sector. Zonal electric fields are obtained from the vertical electric fields based on their relation through the Hall-to-Pedersen ionospheric conductivities ratio. The technique for obtaining the vertical electric field is based on its proportionality to the Doppler velocities of type 2 irregularities as detected by coherent radars. The 50 MHz backscatter coherent (RESCO) radar was used to estimate the Doppler velocities of the type 2 irregularities embedded in the equatorial electrojet. A magnetic field-line integrated conductivity model was developed to provide the conductivities. It considers a multi-species ionosphere and a multi-species neutral atmosphere, and uses the IRI 2007, the MISIS 2000 and the IGRF 10 models as input parameters for ionosphere, neutral atmosphere and Earth’s magnetic field, respectively. The ion-neutral collision frequencies of all the species are combined through the momentum transfer collision frequency equation, and different percentages of electron-neutral collisions were artificially included for studying the implication of such increase in the zonal electric field, which resulted ranging from 0.13 to 0.49 mV/m between the 8 and 18 h (LT), under quiet magnetic conditions.
Keywords :
Anomalous conductivity , Equatorial ionosphere , E region , Electric field
Journal title :
Advances in Space Research
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