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Title:
Interplanetary gas. XXVI - On the reconnection of magnetic fields in cometary ionospheres at interplanetary sector boundary crossings
Authors:
Niedner, M. B., Jr.; Ionson, J. A.; Brandt, J. C.
Affiliation:
AA(NASA, Goddard Space Flight Center, Laboratory for Astronomy and Solar Physics, Greenbelt, Md.), AB(NASA, Goddard Space Flight Center, Laboratory for Astronomy and Solar Physics, Greenbelt, Md.), AC(NASA, Goddard Space Flight Center, Laboratory for Astronomy and Solar Physics, Greenbelt, Md.)
Publication:
Astrophysical Journal, Part 1, vol. 245, May 1, 1981, p. 1159-1169. (ApJ Homepage)
Publication Date:
05/1981
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
COMETS, COSMIC PLASMA, INTERPLANETARY GAS, INTERPLANETARY MAGNETIC FIELDS, IONOSPHERES, MAGNETOHYDRODYNAMICS, COMET TAILS, EARTH IONOSPHERE, TEARING MODES (PLASMAS), TRANSPORT PROPERTIES
Comment:
A&AA ID. AAA029.102.019
DOI:
10.1086/158891
Bibliographic Code:
1981ApJ...245.1159N

Abstract

The reconnection process in the cometary ionosphere believed responsible for the disconnecting plasma tails phenomenon is studied through the basic equations of reconnection theory and current sheet instability criteria. It is proposed that reconnection occurs when the interplanetary magnetic fields incident on a comet that has gone just past a sector boundary are pressed into the fields captured from the previous sector. The fields are of opposite polarity, and the previously captured fields constitute the 'roots' of the plasma tail. An estimated duration of reconnection during a disconnection event (DE) of 0.75 days is used along with estimates of other cometary parameters to construct fusion region dimensions and resistivity with the adopted time scale.

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