Rigidity spectrum of the 27-day variation of the galactic cosmic ray intensity in different epochs of solar activity

Details Rigidity spectrum of the 27-day variation of the galactic cosmic ray intensity in different epochs of solar activity Rigidity spectrum of the 27-day variation of the galactic cosmic ray intensity in different epochs of solar activity

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010adspr..45..429g&link_type=abstract

Advances in Space Research, Volume 45, Issue 3, p. 429-436.

Physics

4

Scientific paper

We study the temporal evolution of the power rigidity spectrum of the first (27 days) and the second (14 days) harmonics of the 27-day variation of the galactic cosmic ray intensity measured by neutron monitors in the period of 1965-2002. The rigidity spectrum of these variations can be approximated by a power law. We show the rigidity spectra of the first and the second harmonics of the 27-day variation of the galactic cosmic ray intensity have similar time profiles. These spectra are hard (γ ≈ 0.5 ± 0.1) and soft (γ ≈ 1.1 ± 0.2) during solar maximum and minimum activity, respectively. We ascribe this to the alternation of the sizes of the modulation regions responsible for the 27-day variation of the galactic cosmic ray intensity in different epochs of solar activity. Especially, the average radial sizes of the modulation regions of the 27-day variation and the heliolatitudinal extension of the heliolongitudinal asymmetry are smaller during solar minimum than during solar maximum. We show also, that the temporal changes of the power rigidity spectra of the first and the second harmonics of the 27-day variation of the galactic cosmic ray intensity are in a negative correlation with the changes of the rigidity spectrum of the corresponding 11-year variation.

Affiliated with

Also associated with

No associations

Rating

Rigidity spectrum of the 27-day variation of the galactic cosmic ray intensity in different epochs of solar activity 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 Rigidity spectrum of the 27-day variation of the galactic cosmic ray intensity in different epochs of solar activity, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rigidity spectrum of the 27-day variation of the galactic cosmic ray intensity in different epochs of solar activity will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1306940