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GEOPHYSICAL RESEARCH LETTERS,
VOL. 33,
L18102,
doi:10.1029/2006GL026732,
2006
Solar control of pre-termination shock energetic particle variations observed at Voyager 1
C. J. Mosley
Fundamental Technologies, LLC, Lawrence, Kansas, USA
T. P. Armstrong
Fundamental Technologies, LLC, Lawrence, Kansas, USA
Abstract
We report an analysis of time variations of several Voyager 1 Low Energy Charged Particle (LECP) rate channels for 2004 mostly
in the pre-termination shock (TS) region and for 2005 in the heliosheath. Protons and oxygen ions coming from the TS during
2004 show autocorrelation peaks at approximately and full solar rotation period. We explain the apparent solar control of particle acceleration at the TS by invoking shock
drift acceleration (SDA) which depends strongly on the angle ΘBn that the interplanetary magnetic field (IMF) makes with the shock surface. Preferred regions of acceleration occur where
ΘBn is near 90°. IMF connection of Voyager 1 to preferred regions on the TS can enhance the access of accelerated particles.
This geometrical situation is only available during 2004. Analyses of the data from 2003 and 2005 do not show peaks at or full solar rotation period.
Received 27
April
2006;
accepted 27
June
2006;
published 19
September
2006.
Index Terms: 2124 Interplanetary Physics: Heliopause and solar wind termination; 2139 Interplanetary Physics: Interplanetary shocks; 2114 Interplanetary Physics: Energetic particles (7514).
Read Full Article (file size: 815117 bytes) Cited by
Citation: Mosley, C. J., and T. P. Armstrong
(2006),
Solar control of pre-termination shock energetic particle variations observed at Voyager 1,
Geophys. Res. Lett.,
33,
L18102,
doi:10.1029/2006GL026732.
Copyright 2006 by the American Geophysical Union.
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