Continuing the Search for the Heliosheath by Voyager 1

Details Continuing the Search for the Heliosheath by Voyager 1 Continuing the Search for the Heliosheath by Voyager 1

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsh41b..02n&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SH41B-02

Physics

2104 Cosmic Rays, 2124 Heliopause And Solar Wind Termination, 2134 Interplanetary Magnetic Fields, 2139 Interplanetary Shocks, 2159 Plasma Waves And Turbulence

Scientific paper

The Voyager 1 spacecraft, V1, has measured the Heliospheric Magnetic Field (HMF) since launch in 1977. This covers more than a full 22 years solar magnetic cycle. V1 data shows that the HMF, on average, is well described by Parker's archimedean spiral structure out to 95 AU and 35 degrees north heliographic latitude if due account is made for time variations of the source HMF field strength and solar wind velocity. The V1 magnetic field observations do not provide any evidence for entry into or exit from a subsonic SW region such as the heliosheath is expected to be nor any crossings of the heliosphere-heliosheath interface, the Termination Shock (TS), as has been reported at 85 AU by Krimigis et al [2003]. Merged Interaction Regions or transient flows are identified by increased fields and associated decreases in the flux of >70 MeV/nuc cosmic rays which are then followed by a recovery of the CR flux. This CR-B relationship has been identified and studied since 1982 when V1 was at 11 AU. A study of magnetic field fluctuations, up to 0.26 Hz, in 2001-2004, shows periods of increases of the daily mean standard deviation, which is a direct measure of the energy in the magnetic field variations. We are unable to identify any coherent correlation of these periods with the reported TS and heliosheath crossings.

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