Global dynamo simulation of ionospheric currents and their connection with the equatorial electrojet and counter electrojet: A case study

1983 ◽  
Vol 88 (A1) ◽  
pp. 253 ◽  
Author(s):  
Christian Hanuise ◽  
Christine Mazaudier ◽  
Paul Vila ◽  
Michel Blanc ◽  
Michel Crochet
Keyword(s):  
Equatorial Electrojet ◽  
Ionospheric Currents ◽  
Counter Electrojet

scholarly journals The quiet-time equatorial electrojet and counter-electrojet.

1979 ◽  
Vol 31 (3) ◽  
pp. 311-340 ◽  
Author(s):  
R. T. MARRIOTT ◽  
A. D. RICHMOND ◽  
S. V. VENKATESWARAN
Keyword(s):  
Equatorial Electrojet ◽  
Quiet Time ◽  
Counter Electrojet

Distortions in the height structure of the equatorial electrojet during counter electrojet events

1994 ◽  
Vol 56 (1) ◽  
pp. 51-58 ◽  
Author(s):  
V.V. Somayajulu ◽  
K.S. Viswanathan ◽  
K.S.V. Subbarao ◽  
L. Cherian
Keyword(s):  
Equatorial Electrojet ◽  
Counter Electrojet

Anomalous responses of the F 2 layer over the Brazilian equatorial sector during a counter electrojet event: a case study

2021 ◽  
Author(s):  
Angela M Santos ◽  
A M Santos ◽  
C G M Brum ◽  
; I S Batista ◽  
J H A Sobral ◽  
...  
Keyword(s):  
Counter Electrojet

scholarly journals SABRE observations of Pi2 pulsations: case studies

1997 ◽  
Vol 15 (1) ◽  
pp. 40-53 ◽  
Author(s):  
E. G. Bradshaw ◽  
M. Lester
Keyword(s):  
Case Studies ◽  
Magnetic Activity ◽  
Auroral Zone ◽  
Field Of View ◽  
Ionospheric Currents ◽  
Pi2 Pulsation ◽  
First Case ◽  
Pi2 Pulsations ◽  
Generation Region

Abstract. The characteristics of substorm-associated Pi2 pulsations observed by the SABRE coherent radar system during three separate case studies are presented. The SABRE field of view is well positioned to observe the differences between the auroral zone pulsation signature and that observed at mid-latitudes. During the first case study the SABRE field of view is initially in the eastward electrojet, equatorward and to the west of the substorm-enhanced electrojet current. As the interval progresses, the western, upward field-aligned current of the substorm current wedge moves westward across the longitudes of the radar field of view. The westward motion of the wedge is apparent in the spatial and temporal signatures of the associated Pi2 pulsation spectra and polarisation sense. During the second case study, the complex field-aligned and ionospheric currents associated with the pulsation generation region move equatorward into the SABRE field of view and then poleward out of it again after the third pulsation in the series. The spectral content of the four pulsations during the interval indicate different auroral zone and mid-latitude signatures. The final case study is from a period of low magnetic activity when SABRE observes a Pi2 pulsation signature from regions equatorward of the enhanced substorm currents. There is an apparent mode change between the signature observed by SABRE in the ionosphere and that on the ground by magnetometers at latitudes slightly equatorward of the radar field of view. The observations are discussed in terms of published theories of the generation mechanisms for this type of pulsation. Different signatures are observed by SABRE depending on the level of magnetic activity and the position of the SABRE field of view relative to the pulsation generation region. A twin source model for Pi2 pulsation generation provides the clearest explanation of the signatures observed.

scholarly journals On the role of vertical electron density gradients in the generation of type II irregularities associated with blanketing ES(ESb) during counter equatorial electrojet events: A case study

Radio Science ◽  
2004 ◽  
Vol 39 (3) ◽  
pp. n/a-n/a ◽  
Author(s):  
C. V. Devasia ◽  
N. Jyoti ◽  
K. S. V. Subbarao ◽  
Diwakar Tiwari ◽  
C. Raghava Reddi ◽  
...  
Keyword(s):  
Electron Density ◽  
Equatorial Electrojet ◽  
Density Gradients ◽  
Type Ii

scholarly journals Longitudinal variation of equatorial electrojet and the occurrence of its counter electrojet

2017 ◽  
Vol 35 (3) ◽  
pp. 535-545 ◽  
Author(s):  
A. Babatunde Rabiu ◽  
Olanike Olufunmilayo Folarin ◽  
Teiji Uozumi ◽  
Nurul Shazana Abdul Hamid ◽  
Akimasa Yoshikawa
Keyword(s):  
Addis Ababa ◽  
Equatorial Electrojet ◽  
Seasonal Distribution ◽  
Horizontal Component ◽  
South American ◽  
The South ◽  
Counter Electrojet ◽  
Western Africa ◽  
Meridional Winds ◽  
Longitudinal Variability

Abstract. We examined the longitudinal variability of the equatorial electrojet (EEJ) and the occurrence of its counter electrojet (CEJ) using the available records of the horizontal component H of the geomagnetic field simultaneously recorded in the year 2009 (mean annual sunspot number Rz  =  3.1) along the magnetic equator in the South American, African, and Philippine sectors. Our results indicate that the EEJ undergoes variability from one longitudinal representative station to another, with the strongest EEJ of about 192.5 nT at the South American axis at Huancayo and a minimum peak of 40.7 nT at Ilorin in western Africa. Obtained longitudinal inequality in the EEJ was explicable in terms of the effects of local winds, dynamics of migratory tides, propagating diurnal tide, and meridional winds. The African stations of Ilorin and Addis Ababa registered the greatest % of CEJ occurrence. Huancayo in South America, with the strongest electrojet strength, was found to have the least occurrence of the CEJ. It is suggested that activities that support strong EEJ inhibits the occurrence of the CEJ. Percentage of occurrence of the CEJ varied with seasons across the longitudes. The order of seasonal variation of morning occurrence does not tally with the evening occurrence order at any station. A semiannual equinoctial maximum in percentage of morning occurrence of the CEJ was obtained at Huancayo and Addis Ababa. Only Addis Ababa recorded equal equinoctial maxima in percentage of evening occurrence of the CEJ. The seasonal distribution of the occurrences of the CEJ at different time regimes implies a seasonal variability of causative mechanisms responsible for the occurrence of the CEJ.

Constraints on Scale Lengths of Equatorial Electrojet and Counter Electrojet Phenomena From the Indian Sector

2018 ◽  
Vol 123 (8) ◽  
pp. 6821-6835 ◽  
Author(s):  
R. K. Archana ◽  
N. Phani Chandrasekhar ◽  
Kusumita Arora ◽  
Nandini Nagarajan
Keyword(s):  
Equatorial Electrojet ◽  
Counter Electrojet ◽  
Indian Sector
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