Interhemispheric asymmetry of the high-latitude ionospheric convection pattern

1994 ◽  
Vol 99 (A4) ◽  
pp. 6491 ◽  
Author(s):  
G. Lu ◽  
A. D. Richmond ◽  
B. A. Emery ◽  
P. H. Reiff ◽  
O. de la Beaujardière ◽  
...  
Keyword(s):  
High Latitude ◽  
Interhemispheric Asymmetry ◽  
Convection Pattern ◽  
Ionospheric Convection

Joint STARE and SABRE radar auroral observations of the high-latitude ionospheric convection pattern

Nature ◽  
1985 ◽  
Vol 316 (6024) ◽  
pp. 133-135 ◽  
Author(s):  
M. D. Burrage ◽  
J. A. Waldock ◽  
T. B. Jones ◽  
E. Nielsen
Keyword(s):  
High Latitude ◽  
Convection Pattern ◽  
Ionospheric Convection

scholarly journals Interhemispheric asymmetry of the high-latitude ionospheric convection on 11-12 May 1999

2003 ◽  
Vol 108 (A5) ◽  
Author(s):  
Nozomu Nishitani ◽  
Vladimir O. Papitashvili ◽  
Tadahiko Ogawa ◽  
Natsuo Sato ◽  
Hisao Yamagishi ◽  
...  
Keyword(s):  
High Latitude ◽  
Interhemispheric Asymmetry ◽  
Ionospheric Convection

scholarly journals Magnetospheric convection from Cluster EDI measurements compared with the ground-based ionospheric convection model IZMEM

2009 ◽  
Vol 27 (8) ◽  
pp. 3077-3087 ◽  
Author(s):  
M. Förster ◽  
Y. I. Feldstein ◽  
S. E. Haaland ◽  
L. A. Dremukhina ◽  
L. I. Gromova ◽  
...  
Keyword(s):  
High Latitude ◽  
Electric Potential ◽  
Potential Distribution ◽  
Spatial And Temporal Variation ◽  
Convection Pattern ◽  
Polar Cap ◽  
Ionospheric Convection ◽  
Electric Potential Distribution ◽  
Convection Model ◽  
The Imf

Abstract. Cluster/EDI electron drift observations above the Northern and Southern polar cap areas for more than seven and a half years (2001–2008) have been used to derive a statistical model of the high-latitude electric potential distribution for summer conditions. Based on potential pattern for different orientations of the interplanetary magnetic field (IMF) in the GSM y-z-plane, basic convection pattern (BCP) were derived, that represent the main characteristics of the electric potential distribution in dependence on the IMF. The BCPs comprise the IMF-independent potential distribution as well as patterns, which describe the dependence on positive and negative IMFBz and IMFBy variations. The full set of BCPs allows to describe the spatial and temporal variation of the high-latitude electric potential (ionospheric convection) for any solar wind IMF condition near the Earth's magnetopause within reasonable ranges. The comparison of the Cluster/EDI model with the IZMEM ionospheric convection model, which was derived from ground-based magnetometer observations, shows a good agreement of the basic patterns and its variation with the IMF. According to the statistical models, there is a two-cell antisunward convection within the polar cap for northward IMFBz+≤2 nT, while for increasing northward IMFBz+ there appears a region of sunward convection within the high-latitude daytime sector, which assumes the form of two additional cells with sunward convection between them for IMFBz+≈4–5 nT. This results in a four-cell convection pattern of the high-latitude convection. In dependence of the ±IMFBy contribution during sufficiently strong northward IMFBz conditions, a transformation to three-cell convection patterns takes place.

scholarly journals A model of the high-latitude ionospheric convection pattern

1982 ◽  
Vol 87 (A8) ◽  
pp. 6339 ◽  
Author(s):  
R. A. Heelis ◽  
J. K. Lowell ◽  
R. W. Spiro
Keyword(s):  
High Latitude ◽  
Convection Pattern ◽  
Ionospheric Convection

scholarly journals Small-scale characteristics of extremely high latitude aurora

2009 ◽  
Vol 27 (9) ◽  
pp. 3335-3347 ◽  
Author(s):  
J. A. Cumnock ◽  
L. G. Blomberg ◽  
A. Kullen ◽  
T. Karlsson ◽  
Keyword(s):  
High Latitude ◽  
Large Scale ◽  
Small Scale ◽  
Strong Correlations ◽  
Polar Cap ◽  
Plasma Flows ◽  
Ionospheric Convection ◽  
Local Closure ◽  
Scale Characteristics

Abstract. We examine 14 cases of an interesting type of extremely high latitude aurora as identified in the precipitating particles measured by the DMSP F13 satellite. In particular we investigate structures within large-scale arcs for which the particle signatures are made up of a group of multiple distinct thin arcs. These cases are chosen without regard to IMF orientation and are part of a group of 87 events where DMSP F13 SSJ/4 measures emissions which occur near the noon-midnight meridian and are spatially separated from both the dawnside and duskside auroral ovals by wide regions with precipitating particles typical of the polar cap. For 73 of these events the high-latitude aurora consists of a continuous region of precipitating particles. We focus on the remaining 14 of these events where the particle signatures show multiple distinct thin arcs. These events occur during northward or weakly southward IMF conditions and follow a change in IMF By. Correlations are seen between the field-aligned currents and plasma flows associated with the arcs, implying local closure of the FACs. Strong correlations are seen only in the sunlit hemisphere. The convection associated with the multiple thin arcs is localized and has little influence on the large-scale convection. This also implies that the sunward flow along the arcs is unrelated to the overall ionospheric convection.

Sign in / Sign up

Export Citation Format

Share Document