Predicted Timing for the Turn-on of Radiation in the Outer Heliosphere due to the Bastille Day Shock

Details Predicted Timing for the Turn-on of Radiation in the Outer Heliosphere due to the Bastille Day Shock Predicted Timing for the Turn-on of Radiation in the Outer Heliosphere due to the Bastille Day Shock

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh31b02r&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SH31B-02

Physics

2111 Ejecta, Driver Gases, And Magnetic Clouds, 2124 Heliopause And Solar Wind Termination, 2139 Interplanetary Shocks, 2152 Pickup Ions, 7513 Coronal Mass Ejections

Scientific paper

The propagation of the 14 July 2000 (Bastille Day) shock complex is modeled throughout the heliosphere, including its interaction with the solar wind termination shock and subsequent propagation into the inner heliosheath. The model includes pickup ions and the ionization cavity explicitly. The Bastille Day shock is used to (i) predict the time when the Voyager spacecraft can expect to observe 2-3 kHz radiation, and (ii) place constraints on the distance to the heliopause in the upwind or nose direction. On the basis of the most widely accepted model for the generation of the 2-3 kHz radiation, we predict that the Bastille Day shock, were it to produce observable radiation in the outer heliosheath, would turn on in Mid October, 2001. The distance to the heliopause at the nose is then estimated to be less than 120 - 130 AU and the distance to the termination shock to be less than 90 AU. A further conclusion is that transmitted interplanetary shocks are very weak when they enter the outer heliosheath, the putative site at which interplanetary shocks radiate, so requiring that the interstellar plasma in this region be primed with a pre-existing energized electron population.

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