Ongoing Recovery of Anomalous Cosmic Rays at 1 AU and Decreasing Radial Intensity Gradients

Details Ongoing Recovery of Anomalous Cosmic Rays at 1 AU and Decreasing Radial Intensity Gradients Ongoing Recovery of Anomalous Cosmic Rays at 1 AU and Decreasing Radial Intensity Gradients

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsh32a..07l&link_type=abstract

American Geophysical Union, Spring Meeting 2007, abstract #SH32A-07

Physics

2100 Interplanetary Physics, 2104 Cosmic Rays, 2114 Energetic Particles (7514)

Scientific paper

Using the Solar Isotope Spectrometer (SIS) on NASA's ACE spacecraft, we have measured the composition and energy spectra of anomalous cosmic rays (ACRs) near 1 AU down to energies of ~10 MeV/nucleon since late 1997. Recently these measurements have been augmented by data from the Low Energy Telescope (LET) on each of the two STEREO spacecraft, which allow us to extend the energy spectra down to ~3 MeV/nucleon. As solar minimum modulation conditions return, ACR intensities at 1 AU are recovering, although they are still a factor of ~5 lower than their peak intensities in 1997. Also, during the present A<0 magnetic polarity cycle their intensities are significantly lower relative to galactic cosmic rays (GCRs) than they were during the last A>0 cycle. We present updated measurements of the variation of the ACR oxygen intensity at 1 AU throughout the solar cycle. By comparing with observations from Voyager 1 and 2 in the outer heliosphere, we estimate the large-scale intensity gradients of ACR oxygen and GCR carbon at solar maximum, solar minimum, and during the ongoing recovery, and we investigate the role of drifts and convective processes in ACR modulation. This work was supported by NASA under grants NAG5-12929, NAS5-03131, and contract NAS7-03001.

Affiliated with

Also associated with

No associations

Rating

Ongoing Recovery of Anomalous Cosmic Rays at 1 AU and Decreasing Radial Intensity Gradients 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 Ongoing Recovery of Anomalous Cosmic Rays at 1 AU and Decreasing Radial Intensity Gradients, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ongoing Recovery of Anomalous Cosmic Rays at 1 AU and Decreasing Radial Intensity Gradients will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1037599