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Title:
Interball contribution to the high-altitude cusp observations
Authors:
Němeček, Z.; Šafránková, J.; Měrka, J.; Šimůnek, J.; Přech, L.
Affiliation:
AA(Faculty of Mathematics and Physics, Charles University, V Holesovickach 2, 180 00 Praha 8, Czech Republic), AB(Faculty of Mathematics and Physics, Charles University, V Holesovickach 2, 180 00 Praha 8, Czech Republic), AC(NASA Goddard Space Flight Center, Greenbelt, MD, USA), AD(Institute of Atmospheric Physics, Czech Academy of Sciences, Bocni II, 141 31 Praha 4, Czech Republic), AE(Faculty of Mathematics and Physics, Charles University, V Holesovickach 2, 180 00 Praha 8, Czech Republic)
Publication:
Planetary and Space Science, Volume 55, Issue 15, p. 2286-2294. (P&SS Homepage)
Publication Date:
12/2007
Origin:
ELSEVIER
Abstract Copyright:
Elsevier Ltd
DOI:
10.1016/j.pss.2007.05.021
Bibliographic Code:
2007P&SS...55.2286N

Abstract

The polar cusps have traditionally been described as narrow funnel-shaped regions of magnetospheric magnetic field lines directly connected to magnetosheath, allowing the magnetosheath plasma to precipitate into the ionosphere. However, recent observations and theoretical considerations revealed that the formation of the cusp cannot be treated separately from the processes along the whole dayside magnetopause and that the plasma in regions like cleft or low-latitude boundary layer is of the same origin. Our review of statistical results as well as numerous case studies identified the anti-parallel merging at the magnetopause as the principal source of the magnetosheath plasma in all altitudes. Since effective merging requires a low plasma speed at the reconnection spot, we have found that the magnetopause shape and especially its indentation at the outer cusp is a very important part of the whole process. The plasma is slowed down in this indentation and arising multiscale turbulent processes enhance the reconnection rate.
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