Results 1 to 10 of about 4,774 (237)
Ionospheric control of space weather [PDF]
Annales Geophysicae, 2021 As proposed by Saka (2019), plasma injections arising out of the auroral ionosphere (ionospheric injection) are a characteristic process of the polar ionosphere at substorm onset.
O. Saka
doaj +1 more source
Fractal approach to description of the auroral structure [PDF]
Annales Geophysicae, 2003 During the last two decades the fractal geometry has become a powerful approach to different physical problems. It is also found to be useful in image processing applications. A numerical quantity that characterizes the auroral structure would be
B. V. Kozelov
doaj +1 more source
Chemistry of the Jovian auroral ionosphere [PDF]
Journal of Geophysical Research: Planets, 1999 We have investigated the chemistry of the Jovian auroral thermosphere‐/ionosphere by modeling the precipitation of high‐energy electrons into the auroral zones using a multistream electron‐transport code and three model thermospheres: a standard model based on pressure and temperature data from Galileo, and two additional models that are characterized ...
Perry, J. J. +3 more
openaire +3 more sources
Westward moving dynamic substorm features observed with the IMAGE magnetometer network and other ground-based instruments [PDF]
Annales Geophysicae, 1998 We present the ground signatures of dynamic substorm features with particular emphasis on the event interpretation capabilities provided by the IMAGE magnetometer network.
H. Lühr +8 more
doaj +1 more source
Ionospheric signatures of magnetospheric boundaries in the post-noon sector [PDF]
Annales Geophysicae, 2000 Spatial structures in ionospheric electron density revealed in a tomographic image have been identified with auroral forms and related to their sources in precipitating particles observed by DMSP satellites.
S. T. Berry +9 more
doaj +1 more source
Auroral and sub-auroral phenomena: an electrostatic picture [PDF]
Annales Geophysicae, 2010 Many auroral and sub-auroral phenomena are manifestations of an underlying magnetosphere-ionosphere coupling. In the electrostatic perspective the associated auroral current circuit describes how the generator (often in the magnetosphere) is connected
J. De Keyser, M. Echim
doaj +1 more source
Ionospheric response to variable electric fields in small-scale auroral structures [PDF]
Annales Geophysicae, 1998 High time and space resolution optical and radar measurements have revealed the influence of electric fields on E-region electron density profiles in small-scale auroral structures.
B. S. Lanchester +6 more
doaj +1 more source
Combined ESR and EISCAT observations of the dayside polar cap and auroral oval during the May 15, 1997 storm [PDF]
Annales Geophysicae, 2000 The high-latitude ionospheric response to a major magnetic storm on May 15, 1997 is studied and different responses in the polar cap and the auroral oval are highlighted.
H. Liu +6 more
doaj +1 more source
The motion of ions in the auroral ionosphere [PDF]
Journal of Geophysical Research: Space Physics, 1998 The ion motion in the E and F regions relative to the local magnetic field line and the horizontal plane has been determined from the European incoherent scatter (EISCAT) common program 1 version I (CP‐1‐I) data. The ion motion highly depends on altitude and magnetospheric electric field strength. Under the condition of a strong electric field (|E| >
Ryoichi Fujii +4 more
openaire +1 more source
Ionospheric Boundaries Derived From Auroral Images
Journal of Geophysical Research: Space Physics, 2022 AbstractThis paper presents updated methods for locating the Poleward and Equatorward Auroral Luminosity Boundaries (PALB and EALB) directly from IMAGE Far UltraViolet (FUV) images of the Northern Hemisphere auroral oval. Separate boundaries are determined from images measured at different FUV wavelengths.
G. Chisham +3 more
openaire +2 more sources