A comparative study of cosmic ray radial and latitudinal gradients in the inner and outer heliosphere

Details A comparative study of cosmic ray radial and latitudinal gradients in the inner and outer heliosphere A comparative study of cosmic ray radial and latitudinal gradients in the inner and outer heliosphere

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jgr...102.4643m&link_type=abstract

Journal of Geophysical Research, Volume 102, Issue A3, p. 4643-4652

Physics

18

Interplanetary Physics: Cosmic Rays, Interplanetary Physics: Interplanetary Magnetic Fields, Interplanetary Physics: Solar Cycle Variations, Interplanetary Physics: Solar Wind Plasma

Scientific paper

The radial and latitudinal intensity gradients of 145-255 MeV/nucleon He, 34-50 MeV/nucleon He and 30-69 MeV H are studied over an extensive range of heliocentric distances and latitudes for the 1993.0-1996.0 time period using data from cosmic ray experiments on the Ulysses, IMP 8, Voyager 1 and 2, and Pioneer 10 spacecraft. The radial gradients are found to decrease rapidly with increasing heliocentric distance and agree with those measured 20 years earlier at a similar phase of the heliomagnetic cycle. The latitudinal gradients measured in the inner and outer heliosphere are in reasonable agreement and positive albeit exceedingly small. In agreement with other Ulysses energetic particle experiments it is found that a shift of heliolatitude by -7° to -10° is necessary to get reasonable symmetry in the measurements at midlatitudes. From the Ulysses data it appears there is a significantly reduced latitudinal variation in the intensity of the three energetic particle components at (magnetic) heliolatitudes above about 50° at this phase of the modulation cycle. Such a reduced entry of cosmic rays over such an extensive area above the solar poles implies a strong modification of the previously assumed cosmic ray transport processes at high latitudes, most probably a considerably increased rate of scattering combined with reduced particle gradient and curvature drifts. A significant higher intensity is observed over the north solar pole than over the south pole for the low-energy components after the corrections have been applied for the temporal changes at the 1-AU baseline.

Affiliated with

Also associated with

No associations

Rating

A comparative study of cosmic ray radial and latitudinal gradients in the inner and outer heliosphere 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 A comparative study of cosmic ray radial and latitudinal gradients in the inner and outer heliosphere, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A comparative study of cosmic ray radial and latitudinal gradients in the inner and outer heliosphere will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-870701