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Detailed Reference Information |
Barnes, A. (1994). Motion of the heliospheric termination shock:, 2. Energy loss due to energetic particle acceleration. Journal of Geophysical Research 99: doi: 10.1029/94JA00262. issn: 0148-0227. |
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We present a generalization of earlier analysis of the motion of the heliospheric termination shock in response to heliospheric disturbances (Barnes, 1993) (paper 1), to allow jump conditions that include an energy sink at the shock front. The motivation for this study is that acceleration of the anomalous cosmic ray component may in fact represent such a sink. We have idealized the situation by assuming an infinitely thin shock parameterized by a quantity &lgr; (0≤&lgr;≤1), defined as the fraction of solar wind energy that is lost due to acceleration of the energetic particle component. If the sink is strong (consuming, say, 50% or more of the incident solar wind energy), the model leads to the following principal conclusions: (1) the shocked plasma would be much denser and cooler than in the standard gasdynamic case, thereby leading to more favorable conditions for direct observation of the shocked plasma; (2) the equilibrium shock position would be slightly farther (<10%) from the Sun than in the standard model; (3) as in the gasdynamic case, the shock would normally be in motion, so that the instantaneous position of the termination shock is not determined by interstellar conditions but by the recent history of the wind that has passed through the termination shock; and (4) the response of the shock to upstream disturbances would be similar to the response in the gasdynamic case, but the speed of the new termination shock would be somewhat smaller (probably by a factor of 4 or less). We estimate that this speed is typically, approximately a few tens of kilometers per second corresponding to an inward or outward excursion of order of <1 to several AU, rather less than conventional estimates of several tens of AU. ¿ American Geophysical Union 1994 |
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Abstract |
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Keywords
Interplanetary Physics, Cosmic rays, Interplanetary Physics, Flare and stream dynamics, Interplanetary Physics, Heliopause and solar wind termination, Interplanetary Physics, Solar wind plasma |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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