Accueil > Séminaires d’Astrophysique > Voyager 1 at the Termination Foreshock, Shock, and Heliosheath : 2002-2006

 

Voyager 1 at the Termination Foreshock, Shock, and Heliosheath : 2002-2006

Stamatios M. Krimigis (Academy of Athens, Grèce. Emeritus Head of the Space Department of The Johns Hopkins University Applied Physics Laboratory, USA)

Par Stephane Charpinet - 23/02/2006

 

Séminaires d’Astrophysique

de l’Observatoire Midi-Pyrénées


Séminaire Exceptionnel de 

Stamatios M. Krimigis

(Academy of Athens, Grèce)

(Emeritus Head of the Space Department of The Johns Hopkins University Applied Physics Laboratory, USA)


Lundi 20 Mars 2006 à 11h

CESR


Voyager 1 at the Termination Foreshock, Shock, and Heliosheath : 2002-2006

It is now evident that Voyager 1 entered the termination foreshock (TFS) at 85 AU in mid-2002, exited this region in early 2003 and re-entered in the late 2003-early 2004 time frame, before finally crossing the termination shock (TS) at 94 AU on December 16, 2004. The TFS region is characterized by large intensities of tangentially outward-moving beams of energetic ions E > 40 keV, and generally isotropic electron intensity increases E > 350 keV (Krimigis et al, 2003 ; Decker et al, 2005). Elevated magnetic field intensities were observed throughout these periods (Burlaga et al, 2003, 2005) and comparison with particle pressures showed this region to be a high-beta plasma (Krimigis et al, 2004, 2005). Proximity of the TS was also evident from occasional electron plasma oscillations seen as early as 91 AU (Gurnett and Kurth, 2005). Radial plasma flow speeds in the heliosheath, as estimated from analysis of low-energy ion angular distributions, remain in the 50-100 km/s range. While Voyager 1 has been monitoring conditions in the heliosheath since late 2004 (beyond 94 AU at N34 deg.), Voyager 2 has been measuring relatively large intensities of termination foreshock particles in the solar wind since about mid-2005 (beyond 77 AU at S25-S27 deg.).

References :
Krimigis, S.M. et al, Nature, 426, pg 45-48, 2003.
Decker, R. B. et al, Science, 309, 2020-2024, 2005.
Burlaga et al, Geophys. Res. Lett., 30, NO. 20, 2072, doi:10.1029/2003GL018291, 2003.
Burlaga, L. F, et al, Science, 309, 2027-2029, 2005
Krimigis S. M., et al, V. Florinski, N. V. Pogorelov, and G. P.
Zank (eds) CP719, American Institute of Physics, 0-7354-0199-3/04, 133-138, 2004.
Krimigis, S. M., et al, Proceedings of the Solar Wind 11 / SOHO 16
Conference,12-17 June 2005, Whistler, Canada, , B. Fleck & T.H. Zurbuchen (eds),
(ESA SP-592, September 2005)
Gurnett, D. A., and W. S. Kurth,, Science, 309, 2025-2027, 2005

 

 

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