Journal ArticleDOI
Ionospheric traveling convection vortices observed near the polar cleft: A triggered response to sudden changes in the solar wind
Reads0
Chats0
TLDR
In this paper, the signatures of localized ionospheric traveling convection vortices were analyzed using 20-second resolution magnetometer data from an array of temporary stations operated around Sondre Stromfjord, Greenland during the summer of 1986.Abstract:
Analysis of 20-second resolution magnetometer data from an array of temporary stations operated around Sondre Stromfjord, Greenland, during the summer of 1986 shows the signatures of localized ionospheric traveling convection vortices. An example of an isolated event of this kind observed near 08 local time is presented in detail. This event consists of a twin vortex pattern of convection consistent with the presence of two field-aligned current filaments separated by about 600 km in the east-west direction. This system of currents is observed to move westward (tailward) past the array of stations at about 4 km/sec. The event is associated with relative quiet time ionospheric convection and occurs during an interval of northward IMF. It is, however, associated with a large fluctuation in both the Z and Y components of the IMF and with a large sudden decrease in the solar wind number density. The propagation of the system is inconsistent with existing models of FTE current systems, but nevertheless appears to be related to a readjustment of the magnetopause boundary to a sudden change in the solar wind dynamic pressure and/or to a change in reconnection brought about by a sudden reorientation of the IMF.read more
Citations
More filters
Journal ArticleDOI
The SuperMAG data processing technique
Jesper Gjerloev,Jesper Gjerloev +1 more
TL;DR: There is no correct baseline determination technique since there does not have a set of ground-truth observations required to make an objective evaluation, so the user must keep in mind the assumptions on which the baseline was determined and draw conclusions accordingly.
Journal ArticleDOI
A model for the transient magnetospheric response to sudden solar wind dynamic pressure variations
TL;DR: In this article, the authors examined the evidence for transient variations in the solar wind dynamic pressure, their effect on magnetopause boundary motion, and the signatures they produce within the magnetosphere and at high-latitude auroral ground stations.
Journal ArticleDOI
The Magnetospheric Response to 8-Minute Period Strong-Amplitude Upstream Pressure Variations
David G. Sibeck,Wolfgang Baumjohann,R. C. Elphic,D. H. Fairfield,Joseph F. Fennell,W. B. Gail,Louis J. Lanzerotti,Ramon Lopez,H. Luehr,A. T. Y. Lui,Carol G. Maclennan,R. W. McEntire,Thomas A. Potemra,T. J. Rosenberg,Kazue Takahashi +14 more
TL;DR: In this paper, a series of brief, strong (delta p/p = 1), dynamic pressure oscillations that occurred in the region upstream of the earth's bow shock during a period of radial interplanetary magnetic field was analyzed.
Journal ArticleDOI
A statistical study of the ionospheric convection response to changing interplanetary magnetic field conditions using the assimilative mapping of ionospheric electrodynamics technique
TL;DR: In this article, the authors examined 65 ionospheric convection changes associated with changes in the Y and Z components of the interplanetary magnetic field (IMF) and measured the IMF reorientations (for all but six of the events) at the Wind satellite.
References
More filters
Journal ArticleDOI
ISEE observations of flux transfer events at the dayside magnetopause
TL;DR: In this paper, the authors examined magnetic field measurements from the ISEE 1 and 2 spacecraft in the vicinity of the magnetopause near local noon on a typical pass when the magnetosheath field is southward.
Journal ArticleDOI
The ionospheric signature of flux transfer events
TL;DR: In this paper, the motion of an isolated flux tube connecting the interplanetary and terrestrial magnetic field that has been created by reconnection at the dayside magnetopause is examined.
Journal ArticleDOI
Flux transfer events: Scale size and interior structure
TL;DR: The first direct investigation of the spatial properties of flux transfer events (FTEs) at the earth's dayside magnetopause is reported in this paper, where simultaneous magnetometer and plasma data from the ISEE 1 and 2 satellites are combined to show that magnetosheath FTEs can have a scale size of the order of an earth radius in the normal direction.
Journal ArticleDOI
Observations of a possible ground signature of flux transfer events
C. K. Goertz,Erling Nielsen,A. Korth,Karl-Heinz Glassmeier,Christos Haldoupis,Per Høeg,D. Hayward +6 more
TL;DR: In this paper, the ground signature of a flux transfer event (FTE) has been observed using the STARE radar system, which has the potential for making observations pertinent to identifying and studying the ionospheric signatures of FTE.
Journal ArticleDOI
Possible evidence of flux transfer events in the polar ionosphere
TL;DR: In this article, magnetic field data from the cusp-latitude South Pole station that exhibit, under appropriate local time and interplanetary magnetic field conditions, the signature expected in the ionosphere from a flux transfer event at the magnetopause.