Abstract
Records of Sunspot Sightings (RSS) which were obtained by the naked eye without the aid of the telescope are essential to find the solar activity in the distant past. Intense solar activity or the solar maxima had been identified by using the RSS for several decades. However, the performance of the RSS as the indicators of the solar maxima has rarely been discussed with quantitative analysis. The RSS from 1613 to 1918 are accessed as the indicators of the solar maxima, by using the time difference between each RSS and the specific solar maxima. The results have shown that about 33% of the sunspot sightings were obtained within one year of the solar maxima and about 51% of the sunspot sightings were obtained within 2 years of the solar maxima. The average time error of identifying the solar maxima by the RSS is 2.52 years, during the period 1613 – 1918. If a certain amount of time error could be tolerated for the identification of the solar maxima, the RSS could be generally used as indicators of the solar maxima.
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