A Caltech Library Service

Using Magnetic Flux Conservation to Determine Heliosheath Speeds

Richardson, J. D. and Cummings, A. C. and Burlaga, L. F. and Giacalone, J. and Opher, M. and Stone, E. C. (2021) Using Magnetic Flux Conservation to Determine Heliosheath Speeds. Astrophysical Journal Letters, 919 (2). Art. No. L28. ISSN 2041-8205. doi:10.3847/2041-8213/ac27b1.

[img] PDF - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


The heliosheath (HSH) radial speeds at Voyager 2 (V2) derived from the plasma instrument (PLS) and from particle instruments using the Compton–Getting (CG) effect are different. At V2 the CG speeds are more variable than the plasma speeds and decrease about 2 yr before the heliopause. We use magnetic flux conservation to differentiate between these two speed profiles at V2, comparing the magnetic flux observed at 1 au and in the HSH. For V2 the PLS speed profile is significantly more consistent with magnetic flux conservation than the CG speeds. For Voyager 1 (V1), we present new V_R derivations from the Cosmic Ray Subsystem (CRS) using the CG method that agree reasonably well with those previously obtained from the low energy charged particle (LECP) instrument. If we use the V2 PLS speed profile to calculate the magnetic flux at V1, we again find much better agreement than if we use the V1 CG speeds. These results suggest that the radial speeds derived from particle anisotropy observations in the HSH are not reliable.

Item Type:Article
Related URLs:
URLURL TypeDescription
Richardson, J. D.0000-0003-4041-7540
Cummings, A. C.0000-0002-3840-7696
Burlaga, L. F.0000-0002-5569-1553
Giacalone, J.0000-0002-0850-4233
Opher, M.0000-0002-8767-8273
Stone, E. C.0000-0002-2010-5462
Additional Information:© 2021. The American Astronomical Society. Received 2021 July 18; revised 2021 September 14; accepted 2021 September 15; published 2021 October 4. J.D.R. was supported under NASA contract 959203 from the Jet Propulsion Laboratory to the Massachusetts Institute of Technology and by grants 2019-064 (UAH) and SUB000318 (IMAP). J.D.R., M.O., and A.C.C. acknowledge support from NASA grant 18-DRIVE18_2-0029, Our Heliospheric Shield, 80NSSC20K0603. A.C.C. and E.C.S. were supported under NASA award number NNN12AA01C. L.F.B. is supported by NASA contract #80GSFC19C0012.
Group:Astronomy Department, Space Radiation Laboratory
Funding AgencyGrant Number
Subject Keywords:Heliosheath
Issue or Number:2
Classification Code:Unified Astronomy Thesaurus concepts: Heliosheath (710)
Record Number:CaltechAUTHORS:20211014-170555669
Persistent URL:
Official Citation:J. D. Richardson et al 2021 ApJL 919 L28
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:111437
Deposited By: George Porter
Deposited On:14 Oct 2021 21:50
Last Modified:14 Oct 2021 21:50

Repository Staff Only: item control page