Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009iaus..257..425c&link_type=abstract
Universal Heliophysical Processes, Proceedings of the International Astronomical Union, IAU Symposium, Volume 257, p. 425-427
Astronomy and Astrophysics
Astronomy
2
(Ism:) Cosmic Rays, (Sun:) Solar Wind, (Sun:) Solar-Terrestrial Relations
Scientific paper
We analyzed the relationship between the ground-based modulation of cosmic rays (CR) and corotating interaction regions (CIRs). Daily averaged data from 8 different neutron monitor (NM) stations were used, covering rigidities from Rc = 0 - 12.91 GeV. The in situ solar wind data were taken from the Advanced Composition Explorer (ACE) database, whereas the coronal hole (CH) areas were derived from the Solar X-Ray Imager onboard GOES-12. For the analysis we have chosen a period in the declining phase of solar cycle 23, covering the period 25 January-5 May 2005. During the CIR periods CR decreased typically from 0.5% to 2%. A cross-correlation analysis showed a distinct anti-correlation between the magnetic field and CR, with the correlation coefficient (r) ranging from -0.31 to -0.38 (mean: -0.36) and with the CR time delay of 2 to 3 days. Similar anti-correlations were found for the solar wind density and velocity characterized by the CR time lag of 4 and 1 day, respectively. The relationship was also established between the CR modulation and the area of the CIR-related CH with the CR time lag of 5 days after the central-meridian passage of CH.
Calogovic Jaša
Temmer Manuela
Veronig Astrid M.
Vrsnak Bojan
No associations
LandOfFree
Cosmic ray modulation by corotating interaction regions 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 Cosmic ray modulation by corotating interaction regions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cosmic ray modulation by corotating interaction regions will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-978527