CAOSP abstracts, Volume: 30, No.: 2, year: 2000
- Author(s): JAKIMIEC, M.; ANTALOVA, A.; STORINI, M.
- Journal: Contributions of the Astronomical Observatory Skalnate Pleso,
vol. 30, no. 2, p. 75-88.
- Date: 10/2000
- Title: Cosmic ray/Soft X-ray background relationship from July 1968 to June 1987
- Keyword(s): THE SUN, NONFLARE (XBG) SOFT X-RAY FLUX, GALACTIC COSMIC RAYS
- Pages: 75 -- 88
The cross-correlation technique has been applied to obtain quantitative
information on the short-term relation between the intensity of the nucleonic
component of galactic cosmic rays (CR), as recorded by the Calgary neutron
monitor, and the solar soft X-ray background (XBG), measured by satellites. The
data consisted of uninterrupted daily sequences from July 1968 to June 1987.
Using the 12-month basic (b_i), detrended (d_i), the running mean (m_i(n)) and
the residual sequences (r_i(n)), where n = 3, 7, 15, 27 days and i = 1,..., 19,
the consecutive CR/XBG cross-correlation functions (ccf-s) were computed with a
time lag ranging from -2 to +60 days. In 13 cases out of the 19 d_i sequences,
a statistically significant anticorrelation was found in the first minimum (for
a lag shorter than or equal to 10 days). The m_i and the r_i sequences helped
to identify fluctuations on different time scales. In Jakimiec, Antalova and
Storini (1999) results for the period July 1968-June 1980 were used to
underline differences and analogies between the descending phase of solar
activity cycle n. 20 and the ascending phase of solar activity cycle n. 21,
i.e., one complete heliomagnetic semicycle. Here we mainly compared the
relationship between both parameters during two consecutive descending phases
of cycle n. 20 with the one of cycle n. 21.
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