Results 21 to 30 of about 2,555 (221)

Effects of solar wind density on auroral electrojets and brightness under influence of substorms [PDF]

Annales Geophysicae, 2009
Using the auroral electrojet indices and Polar Ultraviolet Imager auroral images, we examined two fortuitous events during which the solar wind density had clear enhancements while the other solar wind parameters were relatively constant.
J.-H. Shue, Y. Kamide, J. W. Gjerloev
doaj   +1 more source

Asymmetries in the equatorial electrojet around N-E Brazil sector [PDF]

Annales Geophysicae, 2009
The paper examines the data of geographic northward (X), eastward (Y) and vertical (Z) components of the magnetic field from a dense array of 26 vector magnetometers operated in N-NE Brazil from November 1990 to March 1991.
R. G. Rastogi, N. B. Trivedi
doaj   +1 more source

Flow angle dependence for the asymmetry of broad 50-MHz coherent echoes at large magnetic aspect angles [PDF]

, 1997
International audienceThe skewness of broad Type 2-like spectra has been studied using data collected by two orthogonal CW 50-MHz radio links with co-located scattering volumes. Geometrical aspect angles of observations were about 10°.
Sofko, G.J., Kustov, A. V., Kustov, A.V., Uspensky, M. V., M. V. Uspensky, Sofko, G. J., Koehler, J.A., Uspensky, M.V., A. V. Kustov, Koehler, J. A., J. A. Koehler, G. J. Sofko   +11 more
core   +1 more source

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 ...
MARRIOTT, R. T., RICHMOND, A. D., VENKATESWARAN, S. V.   +2 more
openaire   +2 more sources

Polarization of the auroral electrojet [PDF]

Journal of Geophysical Research, 1972
Consideration of an idealized model of electrojet polarization. Precipitation from the inner edge of the electron plasma sheet creates a density maximum in the auroral-oval ionosphere, which in turn leads to Hall and Pedersen conductance maximums. It is then assumed that a uniform westward convection electric field is imposed on the lower ionosphere ...
F. V. Coroniti, C. F. Kennel
openaire   +1 more source

The response of ionospheric convection in the polar cap to substorm activity [PDF]

Annales Geophysicae, 1995
We report multi-instrument observations during an isolated substorm on 17 October 1989. The EISCAT radar operated in the SP-UK-POLI mode measuring ionospheric convection at latitudes 71°λ-78°λ.
M. Lester, M. Lockwood, T. K. Yeoman, S. W. H. Cowley, H. Lühr, R. Bunting, C. J. Farrugia   +6 more
doaj   +1 more source

The field of the equatorial electrojet from CHAMP data [PDF]

Annales Geophysicae, 2006
We apply a simple linear transform, the along-track second derivative, to four years of scalar and vectorial data from the CHAMP satellite. This transform, reminiscent of techniques used in the interpretation of aeromagnetic surveys, is applied either
J.-L. Le Mouël, P. Shebalin, A. Chulliat   +2 more
doaj   +1 more source

Observations of equatorial ionization anomaly over Africa and Middle East during a year of deep minimum [PDF]

Annales Geophysicae, 2017
In this work, we investigated the veracity of an ion continuity equation in controlling equatorial ionization anomaly (EIA) morphology using total electron content (TEC) of 22 GPS receivers and three ground-based magnetometers (Magnetic Data ...
O. Bolaji, O. Bolaji, O. Owolabi, E. Falayi, E. Jimoh, A. Kotoye, O. Odeyemi, B. Rabiu, P. Doherty, E. Yizengaw, Y. Yamazaki, J. Adeniyi, R. Kaka, K. Onanuga   +13 more
doaj   +1 more source

Auroral electrojet oval [PDF]

Earth, Planets and Space, 2014
The auroral electrojet is enhanced in the polar ionosphere associated with charged particle precipitation and field-aligned currents during substorms. In this paper the geometry of the elctrojet is determined by using the ionospheric equivalent current systems for every 5 minutes during March 18 and 19, 1978.
Chen, Geng-Xiong, Xu, Wen-Yao, Wei, Zi-Gang, Ahn, B. H., Kamide, Y.   +4 more
openaire   +1 more source

About the relationship between auroral electrojets and ring currents [PDF]

Annales Geophysicae, 2000
The relationship between the storm-time ring current and the auroral electrojets is investigated using IMAGE magnetometer data, DSt and H-SYM, and solar wind data. Statistical results as well as the investigation of single events show that the auroral
A. Grafe, A. Grafe, A. Grafe, Y. I. Feldstein   +3 more
doaj   +1 more source