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Radial Velocity along the Voyager 1 Trajectory: The Effect of Solar Cycle

Pogorelov, N. V. and Borovikov, S. N. and Zank, G. P. and Burlaga, L. F. and Decker, R. A. and Stone, E. C. (2012) Radial Velocity along the Voyager 1 Trajectory: The Effect of Solar Cycle. Astrophysical Journal Letters, 750 (1). L4. ISSN 2041-8205. doi:10.1088/2041-8205/750/1/L4.

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As Voyager 1 and Voyager 2 are approaching the heliopause (HP)—the boundary between the solar wind (SW) and the local interstellar medium (LISM)—we expect new, unknown features of the heliospheric interface to be revealed. A seeming puzzle reported recently by Krimigis et al. concerns the unusually low, even negative, radial velocity components derived from the energetic ion distribution. Steady-state plasma models of the inner heliosheath (IHS) show that the radial velocity should not be equal to zero even at the surface of the HP. Here we demonstrate that the velocity distributions observed by Voyager 1 are consistent with time-dependent simulations of the SW-LISM interaction. In this Letter, we analyze the results from a numerical model of the large-scale heliosphere that includes solar cycle effects. Our simulations show that prolonged periods of low to negative radial velocity can exist in the IHS at substantial distances from the HP. It is also shown that Voyager 1 was more likely to observe such regions than Voyager 2.

Item Type:Article
Related URLs:
URLURL TypeDescription
Zank, G. P.0000-0002-4642-6192
Burlaga, L. F.0000-0002-5569-1553
Stone, E. C.0000-0002-2010-5462
Additional Information:© 2012 American Astronomical Society. Received 2012 January 19; accepted 2012 March 14; published 2012 April 9. The authors are grateful to S. T. Suess for valuable comments. This work is supported by NASA grants NNX08AJ21G, NNX08AE41G, NNX09AW44G, NNH09AG62G, NNH09AM47I, NNX09AP74A, NNX09AG63G, NNX10AE46G, NNX12AB30G, and NASA contract NNN06AA01C. Supercomputer time allocations were provided on SGI Pleiades by NASA High-End Computing Program award SMD-10-1691, Cray XT5 Kraken by NSF XSEDE project MCA07S033, and on Cray XT5 Jaguar by ORNL Director Discretion project PSS0006. This work was also supported by the IBEX mission as a part of NASA’s Explorer program.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
NASA High-End Computing ProgramSMD-10-1691
NASA Explorer program Ibex MissionUNSPECIFIED
NSF XSEDE projectMCA07S033
ORNL Director Discretion projectPSS0006
Subject Keywords:ISM: kinematics and dynamics; magnetic fields; solar wind
Issue or Number:1
Record Number:CaltechAUTHORS:20120514-102603617
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Official Citation:Radial Velocity along the Voyager 1 Trajectory: The Effect of Solar Cycle N. V. Pogorelov et al. 2012 ApJ 750 L4
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:31448
Deposited On:15 May 2012 15:54
Last Modified:09 Nov 2021 19:53

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