The solar wind structures associated with cosmic ray decreases and particle acceleration in 1978-1982

Details The solar wind structures associated with cosmic ray decreases and particle acceleration in 1978-1982 The solar wind structures associated with cosmic ray decreases and particle acceleration in 1978-1982

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992sesd.reptr....c&link_type=abstract

In Universities Space Research Association, Goddard Visiting Scientist Program for the Space and Earth Sciences Directorate 26 p

Computer Science

Cosmic Rays, Energetic Particles, Forbush Decreases, Magnetic Storms, Particle Acceleration, Solar Wind, Interplanetary Magnetic Fields, Neutron Counters, Shock Waves, Stellar Mass Ejection

Scientific paper

The time histories of particles in the energy range 1 MeV to 1 GeV at times of all greater than 3 percent cosmic ray decreases in the years 1978 to 1982 are studied. Essentially all 59 of the decreases commenced at or before the passages of interplanetary shocks, the majority of which accelerated energetic particles. We use the intensity-time profiles of the energetic particles to separate the cosmic ray decreases into four classes which we subsequently associate with four types of solar wind structures. Decreases in class 1 (15 events) and class 2 (26 events) can be associated with shocks which are driven by energetic coronal mass ejections. For class 1 events the ejecta is detected at 1 AU whereas this is not the case for class 2 events. The shock must therefore play a dominant role in producing the depression of cosmic rays in class 2 events. In all class 1 and 2 events (which comprise 69 percent of the total) the departure time of the ejection from the sun (and hence the location) can be determined from the rapid onset of energetic particles several days before the shock passage at Earth. The class 1 events originate from within 50 deg of central meridian. Class 3 events (10 decreases) can be attributed to less energetic ejections which are directed towards the Earth. In these events the ejecta is more important than the shock in causing a depression in the cosmic ray intensity. The remaining events (14 percent of the total) can be attributed to corotating streams which have ejecta material embedded in them.

Affiliated with

Also associated with

No associations

Rating

The solar wind structures associated with cosmic ray decreases and particle acceleration in 1978-1982 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 The solar wind structures associated with cosmic ray decreases and particle acceleration in 1978-1982, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The solar wind structures associated with cosmic ray decreases and particle acceleration in 1978-1982 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1142721