scholarly journals On the relaxation of magnetospheric convection when <I>B</I><sub>z</sub> turns northward

2012 ◽  
Vol 30 (6) ◽  
pp. 927-928 ◽  
Author(s):  
M. C. Kelley
Keyword(s):  
Magnetic Field ◽  
Solar Wind ◽  
Magnetic Fields ◽  
Interplanetary Magnetic Field ◽  
Time Constant ◽  
Joule Heat ◽  
Upper Atmosphere ◽  
Joule Dissipation ◽  
Polar Cap ◽  
Magnetospheric Convection

Abstract. The solar wind inputs considerable energy into the upper atmosphere, particularly when the interplanetary magnetic field (IMF) is southward. According to Poynting's theorem (Kelley, 2009), this energy becomes stored as magnetic fields and then is dissipated by Joule heat and by energizing the plasmasheet plasma. If the IMF turns suddenly northward, very little energy is transferred into the system while Joule dissipation continues. In this process, the polar cap potential (PCP) decreases. Experimentally, it was shown many years ago that the energy stored in the magnetosphere begins to decay with a time constant of two hours. Here we use Poynting's theorem to calculate this time constant and find a result that is consistent with the data.

scholarly journals Magnetospheric convection during prolonged intervals with southward interplanetary magnetic field

2006 ◽  
Vol 111 (A10) ◽  
Author(s):  
Raymond J. Walker ◽  
Maha Ashour-Abdalla ◽  
Mostafa El Alaoui ◽  
Ferdinand V. Coroniti
Keyword(s):  
Magnetic Field ◽  
Interplanetary Magnetic Field ◽  
Magnetospheric Convection

scholarly journals Magnetopause motion driven by interplanetary magnetic field variations

2000 ◽  
Vol 105 (A11) ◽  
pp. 25155-25169 ◽  
Author(s):  
D. G. Sibeck ◽  
K. Kudela ◽  
R. P. Lepping ◽  
R. Lin ◽  
Z. Nemecek ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Interplanetary Magnetic Field ◽  
Magnetic Field Variations
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