Two-Time GCR-Flux Decrease Associated With March 2006 Interplanetary Shock Event

Details Two-Time GCR-Flux Decrease Associated With March 2006 Interplanetary Shock Event Two-Time GCR-Flux Decrease Associated With March 2006 Interplanetary Shock Event

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh21b1814w&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SH21B-1814

Physics

[2124] Interplanetary Physics / Heliopause And Solar Wind Termination, [2126] Interplanetary Physics / Heliosphere/Interstellar Medium Interactions

Scientific paper

We have analyzed a realistic and time-varying outer heliosphere using three-dimensional MHD simulation based on the Voyager 2 (V2) observed plasma data. When a large interplanetary shock wave, such as March 2006 event (Richardson et al. 2007) observed by V2, collides with the termination shock (TS), it is found in our simulation that a fast shock is driven downstream of the TS, and the fast shock propagates outward in the heliosheath. The contact surface propagates with plasma flow velocity in the heliosheath. On the other hand, V-1 observations of galactic cosmic rays (GCR) of 70-200 MeV indicates that a two-time Forbush-like flux-decrease was associated with the March 2006 event (Webber et al. 2009). The observed first and second decreases occurred at 2006.29 and 2006.51 respectively, while the crossings of V1 with the fast shock and contact surface in our simulation are 2006.4 and 2006.6, respectively. Hence there is about 0.1 year difference between the V1 observed two-time GCR-flux decrease and the simulated crossing time, though the time-duration between the 1st and 2nd GCR-flux decrease and that between crossings of the fast shock and contact surface are almost the same, i.e., about 0.2 years. The time-difference of 0.1 year between the observations and simulation can be explained if the interplanetary shock speed of the March 2006 event along the Sun-V1 direction is assumed to be about 10 % faster than that observed at V2. Thus the two-time GCR-flux decrease could be caused by the V1 crossings with the fast shock and the contact surface driven by the March 2006 event.

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