CAOSP abstracts, Volume: 34, No.: 3, year: 2004
- Author(s): Minarovjech, M.; Rušin, V.; Rybanský, M.; Kudela, K.; Kollár, V.
- Journal: Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 34, no. 3, p. 197-203.
- Date: 10/2004
- Title: An approach to space weather studies from ground based observations
- Keyword(s): green corona, cosmic ray, space weather
- Pages: 197 -- 203
Abstract:
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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