scholarly journals Indices of equatorial electrojet and counter-electrojet in the Indian region: Evolution of the indices and their authenticity

1983 ◽  
Vol 92 (1) ◽  
pp. 45-55
Author(s):  
B N Bhargava ◽  
B R Arora ◽  
N S Sastri
Keyword(s):  
Equatorial Electrojet ◽  
Indian Region ◽  
Counter Electrojet ◽  
Region Evolution

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

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

Occurrences of counter electrojets and possible ionospheric TEC variations round new Moon and full Moon days across the low latitude Indian region

2019 ◽  
Vol 13 (3) ◽  
pp. 245-255
Author(s):  
Prashanthi Talari ◽  
Sampad Kumar Panda
Keyword(s):  
Full Moon ◽  
Geomagnetic Latitude ◽  
Equatorial Electrojet ◽  
Indian Region ◽  
Electron Content ◽  
Quiet Time ◽  
Low Latitude ◽  
Total Electron ◽  
Cooling Effects ◽  
New Moon

Abstract The present paper investigates the alterations in ionospheric Total Electron Content (TEC) over a low latitude location Bangalore (Geographic latitude {12.9^{\circ }}\hspace{2.38387pt}\text{N} and longitude {77.6^{\circ }}\hspace{2.38387pt}\text{E}; Geomagnetic latitude 4.{5^{\circ }}\hspace{2.38387pt}\text{N}) in India, corresponding to the new Moon and full Moon days which are associated with abnormality in the eastward Equatorial Electrojet (EEJ) currents. It has been well established that even during certain geomagnetic quiet days, the EEJ current direction is reversed, resulting in a westward electrojet current called Counter Electrojet (CEJ) which is more prominent around the new Moon and full Moon days, favored by Sun–Moon–Earth alignments and lunar orbital characteristics. The Global Positioning System (GPS) derived TEC at Bangalore is investigated for full Moon and new Moon and their adjacent days during the period 2008–2015. The presence of CEJ during these days suggests the foremost role of driving EEJ current over the equator in the alterations of spatiotemporal distributions of TEC over the low latitude region. The deviations in quiet time TEC during new Moon and full Moon days are quantified in this study that may give a thrust towards modeling of lunar tidal effects in the flipped ionospheric parameter over the Indian region. The study would also support analysis of future solar eclipse effects on ionosphere those involve additional photoionization production/recombination processes corresponding to the passage of lunar shadow and cooling effects. Moreover, the results underpin modeling and mitigation of ionospheric error in the satellite-based positioning, navigation, and communication applications.

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 Equatorial electrojet in the Indian region during the geomagnetic storm of 13–14 November 1998

2016 ◽  
Vol 125 (3) ◽  
pp. 669-675 ◽  
Author(s):  
H CHANDRA ◽  
R G RASTOGI ◽  
R K CHOUDHARY ◽  
SOM SHARMA
Keyword(s):  
Geomagnetic Storm ◽  
Equatorial Electrojet ◽  
Indian Region

scholarly journals Variability of equatorial counter electrojet signatures in the Indian region

2017 ◽  
Vol 122 (2) ◽  
pp. 2185-2201 ◽  
Author(s):  
N. Phani Chandrasekhar ◽  
R. K. Archana ◽  
Nandini Nagarajan ◽  
Kusumita Arora
Keyword(s):  
Indian Region ◽  
Counter Electrojet
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