Ulysses and IMP-8 Observations of Cosmic Rays and So-lar Energetic Particles from the South Pole to the North Pole of the Sun near Solar Maximum*

Details Ulysses and IMP-8 Observations of Cosmic Rays and So-lar Energetic Particles from the South Pole to the North Pole of the Sun near Solar Maximum* Ulysses and IMP-8 Observations of Cosmic Rays and So-lar Energetic Particles from the South Pole to the North Pole of the Sun near Solar Maximum*

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh42c..06m&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SH42C-06

Physics

2104 Cosmic Rays, 2118 Energetic Particles, Solar, 2162 Solar Cycle Variations (7536)

Scientific paper

The High Energy Telescope (HET) of the Ulysses COSPIN experiment measures intensities of galactic cosmic rays and solar energetic particles (SEPs) with good energy and charge resolution at energies above about 30 MeV/n. Since passing over the South Polar regions of the Sun near solar maximum in late 2000 Ulysses has been rapidly traversing solar latitude in its so-called Fast Latitude Scan (FLS), passing through perihelion near the sun's equator in May 2001. Maximum northern latitude (80.2 deg N) will be reached in October 2001. HET observations since the onset of solar activity, including the South Polar pass and the first part of the FLS, show that SEPs from large events were commonly observed at both Ulysses and Earth (IMP-8) regardless of the radial, latitudinal, or longitudinal separations between Ulysses and Earth. During the decay phases of the events intensities were often almost equal at Ulysses and IMP, even when Ulysses was over the Sun's South Pole and the associated flare site was in the northern hemisphere. This suggests that propagation of particles across the average interplanetary magnetic field in the inner heliosphere is effective enough to relax longitudinal and latitudinal particle intensity gradients within a few days. For galactic cosmic rays, observations from the FLS so far show that latitudinal gradients resulting from solar modulation at solar maximum are <1%/degree, and are in fact consistent with zero to the accuracy of our measurements. The small gradients also suggest effective propagation in the latitudinal direction. We will report observations from the continuing FLS, give a first report of Ulysses observations over the sun's North Polar Regions, and discuss the significance of the results for models of energetic charged particle propagation through the heliosphere. * This work was supported in part by NASA Contract JPL-955432 and by NASA Grant NAG5-8032.

Affiliated with

Also associated with

No associations

Rating

Ulysses and IMP-8 Observations of Cosmic Rays and So-lar Energetic Particles from the South Pole to the North Pole of the Sun near Solar Maximum* 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 Ulysses and IMP-8 Observations of Cosmic Rays and So-lar Energetic Particles from the South Pole to the North Pole of the Sun near Solar Maximum*, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ulysses and IMP-8 Observations of Cosmic Rays and So-lar Energetic Particles from the South Pole to the North Pole of the Sun near Solar Maximum* will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1382325