An approach to space weather studies from ground based observations

Details An approach to space weather studies from ground based observations An approach to space weather studies from ground based observations

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004coska..34..197m&link_type=abstract

Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 34, no. 3, p. 197-203.

Astronomy and Astrophysics

Astronomy

Green Corona, Cosmic Ray, Space Weather

Scientific paper

We use daily values of the green corona hole areas, as prepared from the ground-based observations above the E-limb of the Sun and cosmic ray flux observed at Climax and Huancayo/Haleakala, to study a relation between them during a long-term period. A cross-correlation method has been used in the period 1953-2002 (the end of solar cycle 18 to mid-cycle 23). There were found green coronal hole areas that precede the cosmic ray of 200 - 270 days, with the maximum of 230 days (an average of 8 months). The 27-day rotational periodicity is stored around the maximum of correlation coefficients that reached values of 0.78 and 0.72, respectively. This correlation could be used to forecast the level of the cosmic ray daily flux at neutron monitor energies. We try to explain this behavior in a framework of the total coronal mass and its expansion into the heliosphere.

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