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- W1625933888 abstract "Flare Index-Solar activity can be measured at various heights in the solar atmosphere and these measurements can be compared with observed changes in the heliosphere. The quantitative flare index, Q = it, may be roughly proportional to the total energy emitted by the flare [1]. In this relation, i represents the intensity scale of importance of a flare in Hα and t the duration in Hα (in minutes) of the flare. Table 1 lists values of i used for the determination of Q. The daily sums of the index for the total surface are divided by the total time of observation of that day. Because the time coverage of flare observations is not always complete during a day (sometimes 75% or 90%), it is corrected by dividing by the total time of observations of that day to place the daily sum of the flare index on a common 24-h period. The daily total time of observation is calculated from Solar Geophysical Data Comprehensive Reports. Calculated values are available for general use in anonymous ftp servers of our observatory and NGDC. This data set constitutes almost 37 years. The flare index is an interesting parameter and is of value as a measure of the shortlived activity on the Sun and allows us to study longand intermediate-term variation of the Sun. FI is well correlated (cc=0.83) with the sunspot numbers (R) which are often used as a measure of solar activity. The fit parameters for the 1965 to 2001 period are given by the following equation: Q = 0.2R + 4.6." @default.
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- W1625933888 date "2003-09-01" @default.
- W1625933888 modified "2023-09-27" @default.
- W1625933888 title "Hysteresis phenomenon between flare index and cosmic rays" @default.
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- W1625933888 hasPublicationYear "2003" @default.
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