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Large periodic time variations of termination shock particles between ~0.5-20 mev and 6-14 mev electrons measured by the crs experiment on Voyager 2 as it crossed into the heliosheath in 2007: An example of freshly accelerated cosmic rays?

Webber, W. R. and Cummings, A. C. and Stone, E. C. and McDonald, F. B. and Intriligator, D. S. and Higbie, P. R. and Heikkila, B. and Lal, N. (2012) Large periodic time variations of termination shock particles between ~0.5-20 mev and 6-14 mev electrons measured by the crs experiment on Voyager 2 as it crossed into the heliosheath in 2007: An example of freshly accelerated cosmic rays? . (Unpublished) https://resolver.caltech.edu/CaltechAUTHORS:20200204-090030437

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Abstract

We have examined features in the structure of the heliosheath using the fine scale time variations of termination shock particles (TSP) between ~0.5 - 20 MeV and electrons between 2.5-14 MeV measured by the CRS instrument as the V2 spacecraft crossed the heliospheric termination shock in 2007. The very disturbed heliosheath at V2 is particularly noteworthy for strong periodic intensity variations of the TSP just after V2 crossed the termination shock (2007.66) reaching a maximum between 2007.75 and 2008.0. A series of 42/21 day periodicities was observed at V2 along with spectral changes of low energy TSP and the acceleration of 6-14 MeV electrons. Evidence is presented for the acceleration of TSP and electrons at the times of the 42/21 day periodicities just after V2 crossed the HTS. Spectra for TSP between 2-20 MeV and electrons between 2.5-14 MeV are derived for three time periods including the time of the HTS crossing. The energy spectra of TSP and electrons at these times of intensity peaks are very similar above ~3 MeV, with exponents of a power law spectrum between -3.0 and -3.6. The ratio of TSP intensities to electron intensities at the same energy is ~500. The electron intensity peaks and minima are generally out of phase with those of nuclei by ~1/2 of a 42 day cycle. These charge dependent intensity differences and the large periodic intensity changes could provide new clues as to a possible acceleration mechanism.


Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription
http://arxiv.org/abs/1208.2982arXivDiscussion Paper
http://voyager.gsfc.nasa.govRelated ItemData
ORCID:
AuthorORCID
Cummings, A. C.0000-0002-3840-7696
Stone, E. C.0000-0002-2010-5462
Additional Information:The authors all appreciate the support of the Voyager program by JPL. The data used here comes mainly from internally generated data bases which may be accessed via e-mail through the web-site (http://voyager.gsfc.nasa.gov).
Group:Space Radiation Laboratory
Record Number:CaltechAUTHORS:20200204-090030437
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200204-090030437
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:101106
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:04 Feb 2020 17:12
Last Modified:04 Feb 2020 17:12

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