Response of auroral regions to directional changes of the interplanetary magnetic field: Case study

1994 ◽  
Vol 17 (3) ◽  
pp. 313-321
Author(s):  
G. Mastrantonio ◽  
M. Candidi ◽  
F. Mastrantonio ◽  
C. -I. Meng
Keyword(s):  
Magnetic Field ◽  
Interplanetary Magnetic Field ◽  
Field Case

scholarly journals Dayside ionospheric response to changes in IMF polarity: optical and plasma-flow observations

2000 ◽  
Vol 18 (7) ◽  
pp. 782-788 ◽  
Author(s):  
S. E. Pryse ◽  
A. M. Smith ◽  
L. Kersley
Keyword(s):  
Magnetic Field ◽  
Interplanetary Magnetic Field ◽  
Plasma Flow ◽  
Line Emission ◽  
Line Of Sight ◽  
Magnetospheric Physics ◽  
Polar Cap ◽  
Ionospheric Response ◽  
Present Case Study

Abstract. The response of the dayside ionosphere to changes in polarity of the interplanetary magnetic field was observed by two independent techniques. The signatures were seen in the 630.0 nm red-line emission, measured by a meridian scanning photometer at Ny-Ålesund on Svalbard, and also in the line-of-sight plasma velocities monitored by the Finland CUTLASS SuperDARN radar. A time difference of some 6 to 8 min occurred between the responses of the two techniques, with the flows being first to respond. In the present case study, the longer delay in the optics suggests that ion precipitation controls the auroral emission.Key words: Ionosphere (ionosphere-magnetosphere interactions) · Magnetospheric physics (magnetosphere-ionosphere interactions; polar cap phenomena)

scholarly journals Pattern recognition in time series for space missions: A rosetta magnetic field case study

2020 ◽  
Vol 168 ◽  
pp. 123-129
Author(s):  
K. Ostaszewski ◽  
P. Heinisch ◽  
I. Richter ◽  
H. Kroll ◽  
W.-T. Balke ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Time Series ◽  
Pattern Recognition ◽  
Space Missions ◽  
Field Case

Correction to “Ionospheric convection response to slow, strong variations in a northward interplanetary magnetic field: A case study for January 14, 1988”

1994 ◽  
Vol 99 (A4) ◽  
pp. 6541 ◽  
Author(s):  
D. J. Knipp ◽  
B. A. Emery ◽  
A. D. Richmond ◽  
N. U. Crooker ◽  
M. R. Hairston ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Interplanetary Magnetic Field ◽  
Ionospheric Convection

scholarly journals Multi-instrument observations of nightside plasma patches under conditions of IMF <I>B<sub>z</sub></I> positive

2008 ◽  
Vol 26 (8) ◽  
pp. 2203-2216 ◽  
Author(s):  
A. G. Wood ◽  
S. E. Pryse ◽  
H. R. Middleton ◽  
V. S. C. Howells
Keyword(s):  
Magnetic Field ◽  
Interplanetary Magnetic Field ◽  
Case Studies ◽  
Significant Role ◽  
Convective Flow ◽  
Magnetic Sector ◽  
Plasma Drift ◽  
First Case ◽  
Eiscat Radar

Abstract. Results are presented from two multi-instrument case studies showing patches of cold, long-lived plasma in the winter nightside ionosphere during times when the z-component of the Interplanetary Magnetic Field (IMF Bz) was positive. These enhancements were coincident with the antisunward convective plasma drift, flowing from polar to nightside auroral latitudes. In the first case, on 5 December 2005 with IMF By negative, two regions of enhanced electron density were observed extended in MLT in the magnetic midnight sector separated by lower densities near midnight. It is likely that the earlier enhancement originated on the dayside near magnetic noon and was transported to the nightside sector in the convective flow, whilst the later feature originated in the morning magnetic sector. The lower densities separating the two enhancements were a consequence of a pair of lobe cells essentially blocking the direct antisunward cross polar flow from the dayside. A second case study on 4 February 2006 with IMF By positive revealed a single nightside enhancement likely to have originated in the morning magnetic sector. These multi-instrument investigations, incorporating observations by the EISCAT radar facility, the SuperDARN network and radio tomography, reveal that plasma flowing from the dayside can play a significant role in the nightside ionosphere under conditions of IMF Bz positive. The observations are reinforced by simulations of flux-tube transport and plasma decay.

On the electrodynamical state of the auroral ionosphere during northward interplanetary magnetic field: A Transpolar Arc Case Study

1991 ◽  
Vol 96 (A6) ◽  
pp. 9567 ◽  
Author(s):  
G. T. Marklund ◽  
L. G. Blomberg ◽  
J. S. Murphree ◽  
R. D. Elphinstone ◽  
L. J. Zanetti ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Interplanetary Magnetic Field ◽  
Auroral Ionosphere

scholarly journals Ionospheric convection response to slow, strong variations in a northward interplanetary magnetic field: A case study for January 14, 1988

1993 ◽  
Vol 98 (A11) ◽  
pp. 19273-19292 ◽  
Author(s):  
D. J. Knipp ◽  
B. A. Emery ◽  
A. D. Richmond ◽  
N. U. Crooker ◽  
M. R. Hairston ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Interplanetary Magnetic Field ◽  
Ionospheric Convection
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