Physics – Space Physics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsh24a..08o&link_type=abstract
American Geophysical Union, Spring Meeting 2008, abstract #SH24A-08
Physics
Space Physics
2124 Heliopause And Solar Wind Termination, 2126 Heliosphere/Interstellar Medium Interactions, 2134 Interplanetary Magnetic Fields, 2139 Interplanetary Shocks
Scientific paper
Magnetic effects are ubiquitous and known to be crucial in space physics and astrophysical media; Space physics is an excellent plasma laboratory and provide observational data that add crucial constraints to theoretical models. Voyager 1 crossed in Dec 2004, the termination shock and is now in the heliosheath. On August 30, 2007 Voyager 2 crossed the termination shock providing us for the first time with in-situ measurements of the subsonic solar wind in the heliosheath. In this talk I will review our recent results that indicate that magnetic effects, in particular the interstellar magnetic field, are very important in the interaction between the solar system and the interstellar medium. Recently, combining radio emission and energetic particle streaming measurements from Voyager 1 and 2 with extensive state-of-the art 3D MHD modeling, we were able to constrain the direction of the local interstellar magnetic field. Although might take 7-12 years for Voyager 2 to leave the heliosheath and enter the pristine interstellar medium, the subsonic flows are immediately sensitive to the shape of the heliopause. We show that the flows measured by Voyager 2 from days 258-350 indicate that the heliopause is being distorted by a local interstellar magnetic field ~ 60°-90° from the galactic plane. This confirms our earlier prediction that the field orientation in the Local Interstellar Cloud differs that of a larger scale interstellar magnetic field, thought to parallel the galactic plane. As a result of the interstellar magnetic field the solar system is asymmetric being pushed in the southern direction.
Gombosi Tamas I.
Opher Merav
Richardson Jenny C.
Stone Edward C.
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