Results 21 to 30 of about 1,041 (168)

The quiet-time equatorial electrojet and counter-electrojet.

Journal of geomagnetism and geoelectricity, 1979
Using ground magnetometer data from several stations near the dip equator, the magnetically quiet-time characteristics of the daytime normal electrojet and the morning and afternoon counter-electrojets are established and illustrated. In particular, the solar cycle, seasonal, longitudinal and day-to-day variations of counter-electrojets as well as ...
R. T. MARRIOTT, A. D. RICHMOND, S. V. VENKATESWARAN   +2 more
openaire   +2 more sources

Equatorial Counter Electrojet Longitudinal and Seasonal Variability in the American Sector [PDF]

Journal of Geophysical Research: Space Physics, 2018
AbstractThe equatorial electrojet occasionally reverses during morning and afternoon hours, leading to periods of westward current in the ionospheric E region that are known as counter electrojet (CEJ) events. We present the first analysis of CEJ climatology and CEJ dependence on solar flux and lunar phase for the Brazilian sector, based on an ...
Gabriel Soares, Yosuke Yamazaki, Jürgen Matzka, Katia Pinheiro, Achim Morschhauser, Claudia Stolle, Patrick Alken   +6 more
openaire   +6 more sources

Sq and EEJ—A Review on the Daily Variation of the Geomagnetic Field Caused by Ionospheric Dynamo Currents [PDF]

, 2016
A record of the geomagnetic field on the ground sometimes shows smooth daily variations on the order of a few tens of nano teslas. These daily variations, commonly known as Sq, are caused by electric currents of several μA/m^2 flowing on the sunlit side ...
Maute, Astrid, Yamazaki, Yosuke
core   +2 more sources

Equatorial Counter-Electrojet and Magnetic Pulsations.

Journal of geomagnetism and geoelectricity, 1997
The signal amplitudes in the Hx component of magnetic pulsations undergo significant enhancement at the dip equator during intervals of Equatorial Electrojet (EEJ), the enhancement attaining a peak value during prenoon hours. On the other hand, it is shown in this study, that the enhancement peak which occurs during prenoon hours on EEJ days shifts ...
T. S. Sastry, S. V. S. Sarma
openaire   +2 more sources

Effects of electrojet turbulence on a magnetosphere-ionosphere simulation of a geomagnetic storm [PDF]

, 2017
Ionospheric conductance plays an important role in regulating the response of the magnetosphere‐ionosphere system to solar wind driving. Typically, models of magnetosphere‐ionosphere coupling include changes to ionospheric conductance driven by extreme ...
Dimant, Y., Liu, J., Lyon, J.G., Merkin, V., Oppenheim, M., Sitnov, M.I., Stephens, G.K., Toffoletto, F., Wang, W., Wiltberger, M., Zhang, B.   +10 more
core   +1 more source

Formation and identification of counter electrojet (CEJ)

International Journal of Physical Sciences, 2013
This study investigates the possible occurrence of counter equatorial electrojet (CEJ) and a quicker method for identification of CEJ. Data from a chain of magnetic observatories of World Data Center for Geomagnetism in Tokyo, Japan, was employed. It is strikingly interesting to observe that most CEJ occurred from morning through new dusk, with almost ...
N Okeke Francisca, A Hanson Esther, C Okoro Eucharia, B C Isikwue, J Ugonabo Oby   +4 more
openaire   +2 more sources

Variability of equatorial counter electrojet signatures in the Indian region [PDF]

Journal of Geophysical Research: Space Physics, 2017
AbstractThe limited longitudinal extent of equatorial counter electrojet (CEJ) has been inferred by several workers based on the analysis of ground data. However, the scale length of CEJ characteristics at 2 h or less has not been estimated so far. The present study seeks to characterize the longitudinal variability of CEJ phenomena at a longitudinal ...
N. Phani Chandrasekhar, R. K. Archana, Nandini Nagarajan, Kusumita Arora   +3 more
openaire   +1 more source

On the height variation of the E-region cowling conductivity ? effect of charged dust particles [PDF]

, 2006
International audienceHeight profiles of the Cowling conductivity in the electrojet region, estimated using the atmospheric parameters given by the existing models like CIRA or MSIS and measured electron density profiles, consistently show the heights of
Kulkarni, V. H., Muralikrishna, P.
core   +2 more sources

Solar quiet current response in the African sector due to a 2009 sudden stratospheric warming event [PDF]

, 2016
We present solar quiet (Sq) variation of the horizontal (H) magnetic field intensity deduced from Magnetic Data Acquisition System (MAGDAS) records over Africa during an unusual strong and prolonged 2009 sudden stratospheric warming (SSW) event.
Amory-Mazaudier, C., Bolaji, O.S., Fujimoto, A., Okoh, D., Onanuga, O.K., Owolabi, O.P., Oyeyemi, E.O., Rabiu, A.B., Seemala, G.K., Yamazaki, Yosuke, Yoshikawa, A.   +10 more
core   +4 more sources

Occurrence of blanketing E_s layer (E_sb) over the equatorial region during the peculiar minimum of solar cycle 24 [PDF]

Annales Geophysicae, 2014
A thin and highly dense sporadic E layer, which can occasionally block the upper ionospheric layers, is called blanketing sporadic E (Esb). We present the statistical seasonal local time occurrence pattern of Esb at equatorial station Tirunelveli (8 ...
V. Yadav, B. Kakad, C. K. Nayak, G. Surve, K. Emperumel   +4 more
doaj   +1 more source