scholarly journals Transient changes in magnetospheric-ionospheric currents caused by the passage of an interplanetary shock: Northward interplanetary magnetic field case

2010 ◽  
Vol 115 (A5) ◽  
pp. n/a-n/a ◽  
Author(s):  
A. A. Samsonov ◽  
D. G. Sibeck ◽  
Yiqun Yu
Keyword(s):  
Magnetic Field ◽  
Interplanetary Magnetic Field ◽  
Interplanetary Shock ◽  
Ionospheric Currents ◽  
Field Case

Degenerate induced magnetospheres

2020 ◽  
Author(s):  
Stas Barabash ◽  
Andrii Voshchepynets ◽  
Mats Holmström ◽  
Futaana Yoshifumi ◽  
Robin Ramstad
Keyword(s):  
Magnetic Field ◽  
Solar Wind ◽  
Magnetic Fields ◽  
Interplanetary Magnetic Field ◽  
Solar Wind Plasma ◽  
Stellar Winds ◽  
Ionospheric Currents ◽  
Magnetic Barrier ◽  
Atmospheric Escape ◽  
The Subject

<p>Induced magnetospheres of non-magnetized atmospheric bodies like Mars and Venus are formed by magnetic fields of ionospheric currents induced by the convective electric field E = - V x B/c of the solar wind. The induced magnetic fields create a magnetic barrier which forms a void of the solar wind plasma, an induced magnetosphere. But what happens when the interplanetary magnetic field is mostly radial and the convective field E ≈ 0? Do a magnetic barrier and solar wind void form? If yes, how such a degenerate induced magnetosphere work? The question is directly related to the problem of the atmospheric escape due to the interaction with the solar and stellar winds. The radial interplanetary magnetic field in the inner solar system is typical for the ancient Sun conditions and exoplanets on near-star orbits. Also, the radial interplanetary field may provide stronger coupling of the near-planet environment with the solar/stellar winds and thus effectively channels the solar/stellar wind energy to the ionospheric ions. We review the current works on the subject, show examples of degenerate induced magnetospheres of Mars and Venus from Mars Express, Venus Express, and MAVEN measurements and hybrid simulations, discuss physics of degenerate induced magnetospheres, and impact of such configurations on the escape processes.</p>

Interplanetary magnetic-field direction and high-latitude ionospheric currents

1972 ◽  
Vol 77 (10) ◽  
pp. 1976-1977 ◽  
Author(s):  
T. Stockflet Jørgensen ◽  
E. Friis-Christensen ◽  
J. Wilhjelm
Keyword(s):  
Magnetic Field ◽  
Interplanetary Magnetic Field ◽  
High Latitude ◽  
Field Direction ◽  
Magnetic Field Direction ◽  
Ionospheric Currents

scholarly journals Investigating the auroral electrojets with low altitude polar orbiting satellites

2002 ◽  
Vol 20 (7) ◽  
pp. 1049-1061 ◽  
Author(s):  
T. Moretto ◽  
N. Olsen ◽  
P. Ritter ◽  
G. Lu
Keyword(s):  
Magnetic Field ◽  
Interplanetary Magnetic Field ◽  
Magnetic Measurements ◽  
Activity Index ◽  
Satellite Observations ◽  
Polar Regions ◽  
Hemispheric Differences ◽  
Ionospheric Currents ◽  
Low Altitude ◽  
Current Systems

Abstract. Three geomagnetic satellite missions currently provide high precision magnetic field measurements from low altitude polar orbiting spacecraft. We demonstrate how these data can be used to determine the intensity and location of the horizontal currents that flow in the ionosphere, predominantly in the auroral electrojets. First, we examine the results during a recent geomagnetic storm. The currents derived from two satellites at different altitudes are in very good agreement, which verifies good stability of the method. Further, a very high degree of correlation (correlation coefficients of 0.8–0.9) is observed between the amplitudes of the derived currents and the commonly used auroral electrojet indices based on magnetic measurements at ground. This points to the potential of defining an auroral activity index based on the satellite observations, which could be useful for space weather monitoring. A specific advantage of the satellite observations over the ground-based magnetic measurements is their coverage of the Southern Hemisphere, as well as the Northern. We utilize this in an investigation of the ionospheric currents observed in both polar regions during a period of unusually steady interplanetary magnetic field with a large negative Y-component. A pronounced asymmetry is found between the currents in the two hemispheres, which indicates real inter-hemispheric differences beyond the mirror-asymmetry between hemispheres that earlier studies have revealed. The method is also applied to another event for which the combined measurements of the three satellites provide a comprehensive view of the current systems. The analysis hereof reveals some surprising results concerning the connection between solar wind driver and the resulting ionospheric currents. Specifically, preconditioning of the magnetosphere (history of the interplanetary magnetic field) is seen to play an important role, and in the winther hemisphere, it seems to be harder to drive currents on the nightside than on the dayside.Key words. Ionosphere (electric fields and currents) – Magnetospheric physics (current systems; magnetosphere-ionosphere interactions)

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

Fluctuations of cosmic rays and interplanetary magnetic field in the vicinity of interplanetary shock fronts

2007 ◽  
Vol 71 (7) ◽  
pp. 991-993
Author(s):  
S. A. Starodubtsev ◽  
A. V. Grigor’ev ◽  
V. G. Grigor’ev ◽  
I. G. Usoskin ◽  
K. Mursula
Keyword(s):  
Magnetic Field ◽  
Cosmic Rays ◽  
Interplanetary Magnetic Field ◽  
Interplanetary Shock ◽  
Shock Fronts

H-Cmes and Ii-Type Radio Bursts Related Intense Geomagnetic Storms in Relation With Interplanetary Magnetic Field and Solar Wind Disturbances

2012 ◽  
Vol 2 (10) ◽  
pp. 1-3 ◽  
Author(s):  
Praveen Kumar Gupta ◽  
◽  
Puspraj Singh Puspraj Singh ◽  
Puspraj Singh Puspraj Singh ◽  
P. K. Chamadia P. K. Chamadia
Keyword(s):  
Magnetic Field ◽  
Solar Wind ◽  
Interplanetary Magnetic Field ◽  
Geomagnetic Storms ◽  
Radio Bursts ◽  
Solar Wind Disturbances
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