Observational signatures of the influence of the interplanetary shocks on the associated low-energy particle events

Details Observational signatures of the influence of the interplanetary shocks on the associated low-energy particle events Observational signatures of the influence of the interplanetary shocks on the associated low-energy particle events

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....99...43h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A1, p. 43-51

Physics

19

Interplanetary Magnetic Fields, Interplanetary Medium, Magnetic Field Reconnection, Particle Acceleration, Particle Energy, Shock Waves, Energetic Particles, International Sun Earth Explorer 3, Wave Propagation

Scientific paper

We have analyzed the temporal evolution of the upstream particle fluxes and anisotropies in a set of particle events associated with interplanetary shocks, detected by International Sun-Earth Explorer (ISEE) 3 during the period 1978-1980 in the 147-238 and 620-1000 keV energy ranges. In particular, we have studied those features that can perhaps be used as signatures of the history of the influence of the shock on the particle event. We have paid special attention to the evolution of the flux anisotropy that can carry relevant information on the contribution of shock accelerated particles to the total observed flux. Our analysis shows that during most events, long-lasting (between 5 and 36 hours) large anisotropies are observed upstream of the shock, supporting the hypothesis of continuous injection of shock accelerated paricles in the interplanetary medium while the shock is propagating outward from the Sun. The evolution of the anisotropy throughout each event shows a dependence on the longitude of the parent solar source. We have interpreted the observations considering that shock accelerated particles contribute significantly to the total observed flux from the time when the shock intersects the magnetic field line that connects with the observer. The heliocentric distance of this initial intersection point has been derived from the flux anisotropy observations for each event. The values obtained show a distribution with respect to the longitude of the solar source that can be reproduced with a simple model, which assumes a spherical shock with an angular extension approximately equals 100 deg and an archimedian spiral structure for the interplanetary magnetic field. The results of this work provide a further insight into both the importance of shock acceleration, as well as the influence of the large-scale shock structure in low-energy particle events.

Affiliated with

Also associated with

No associations

Rating

Observational signatures of the influence of the interplanetary shocks on the associated low-energy particle events does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Observational signatures of the influence of the interplanetary shocks on the associated low-energy particle events, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Observational signatures of the influence of the interplanetary shocks on the associated low-energy particle events will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-869948