Relation of the X-ray bright point number to the X-ray background on the sun
Аннотация
Abstract The relation of the X-ray bright point number to the intensity of X-ray background is studied on the basis of satellite observations. The daily X-ray bright point number for the time interval 1991–1999 was inferred from YOHKOH Soft X-ray telescope data. It was found that the X-ray bright point number is indeed anti-correlated with the solar activity indices as was found from SKYLAB data a little earlier. At the same time the X-ray bright point number is anti-correlated with the intensity of the X-ray background from GOES data. The high degree of anti-correlation of the number of XBPs with the X-ray background data inspires the assumption that the number of XBPs slightly alters during the solar cycle. It was shown that the maximum number of XBPs strongly depends on the X-ray background level: the lower the level, the greater the number.