Effective time of observations of chromospheric flares.
Abstract
In order to compare most indices of solar activity it is necessary to know the time (duration) of observation of chromosphere flares. An effective time of observation is defined as the sum of three terms: (1) the total number of hours of actual observation, (2) the sum of all intervals of duration no greater than the effective mean life time of a flare, and (3) the product of the number of intervals without observations of duration longer than the effective mean lifetime of a flare times the effective mean lifetime of a flare. The ratio of the maximum possible number of observation hours in a day (24 hours) to the effective time of observation was calculated and tabulated for all days of the years 19561966 on the basis of data from Warwick's catalogs, the Quarterly Bulletins, and the Solar Geophysical Data.
 Publication:

Astrometriia i Astrofizika
 Pub Date:
 1977
 Bibcode:
 1977AAfz...33...55E
 Keywords:

 Chromosphere;
 Solar Flares;
 Visual Observation;
 Annual Variations;
 Long Term Effects;
 Tables (Data);
 Time Response;
 Solar Physics