Active Days around Solar Minimum and Solar Cycle Parameter
Utilizing a new version of the sunspot number and group sunspot number dataset available since 2015, we have statistically studied the relationship between solar activity parameters describing solar cycles and the slope of the linear relationship between the monthly sunspot numbers and the monthly...
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doaj-857de4a9c232436791b8c76f69339e942021-05-05T06:05:48ZengKorean Space Science Society (KSSS)Journal of Astronomy and Space Sciences2093-55872093-14092021-03-01381232910.5140/JASS.2021.38.1.23Active Days around Solar Minimum and Solar Cycle ParameterHeon-Young Chang0https://orcid.org/0000-0003-2015-2725Kyungpook National University, KoreaUtilizing a new version of the sunspot number and group sunspot number dataset available since 2015, we have statistically studied the relationship between solar activity parameters describing solar cycles and the slope of the linear relationship between the monthly sunspot numbers and the monthly number of active days in percentage (AD). As an effort of evaluating possibilities in use of the number of active days to predict solar activity, it is worthwhile to revisit and extend the analysis performed earlier. In calculating the Pearson’s linear correlation coefficient r, the Spearman’s rank-order correlation coefficient rs, and the Kendall’s τ coefficient with the rejection probability, we have calculated the slope for a given solar cycle in three different ways, namely, by counting the spotless day that occurred during the ascending phase and the descending phase of the solar cycle separately, and during the period corresponding to solar minimum ± 2 years as well. We have found that the maximum solar sunspot number of a given solar cycle and the duration of the ascending phase are hardly correlated with the slope of a linear function of the monthly sunspot numbers and AD. On the other hand, the duration of a solar cycle is found to be marginally correlated with the slope with the rejection probabilities less than a couple of percent. We have also attempted to compare the relation of the monthly sunspot numbers with AD for the even and odd solar cycles. It is inconclusive, however, that the slopes of the linear relationship between the monthly group numbers and AD are subject to the even and odd solar cycles.sunsunspot numbers |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Heon-Young Chang |
spellingShingle |
Heon-Young Chang Active Days around Solar Minimum and Solar Cycle Parameter Journal of Astronomy and Space Sciences sun sunspot numbers |
author_facet |
Heon-Young Chang |
author_sort |
Heon-Young Chang |
title |
Active Days around Solar Minimum and Solar Cycle Parameter |
title_short |
Active Days around Solar Minimum and Solar Cycle Parameter |
title_full |
Active Days around Solar Minimum and Solar Cycle Parameter |
title_fullStr |
Active Days around Solar Minimum and Solar Cycle Parameter |
title_full_unstemmed |
Active Days around Solar Minimum and Solar Cycle Parameter |
title_sort |
active days around solar minimum and solar cycle parameter |
publisher |
Korean Space Science Society (KSSS) |
series |
Journal of Astronomy and Space Sciences |
issn |
2093-5587 2093-1409 |
publishDate |
2021-03-01 |
description |
Utilizing a new version of the sunspot number and group sunspot number dataset available since 2015, we have statistically
studied the relationship between solar activity parameters describing solar cycles and the slope of the linear relationship between
the monthly sunspot numbers and the monthly number of active days in percentage (AD). As an effort of evaluating possibilities
in use of the number of active days to predict solar activity, it is worthwhile to revisit and extend the analysis performed earlier. In
calculating the Pearson’s linear correlation coefficient r, the Spearman’s rank-order correlation coefficient rs, and the Kendall’s τ
coefficient with the rejection probability, we have calculated the slope for a given solar cycle in three different ways, namely, by
counting the spotless day that occurred during the ascending phase and the descending phase of the solar cycle separately, and
during the period corresponding to solar minimum ± 2 years as well. We have found that the maximum solar sunspot number of
a given solar cycle and the duration of the ascending phase are hardly correlated with the slope of a linear function of the monthly
sunspot numbers and AD. On the other hand, the duration of a solar cycle is found to be marginally correlated with the slope with
the rejection probabilities less than a couple of percent. We have also attempted to compare the relation of the monthly sunspot
numbers with AD for the even and odd solar cycles. It is inconclusive, however, that the slopes of the linear relationship between
the monthly group numbers and AD are subject to the even and odd solar cycles. |
topic |
sun sunspot numbers |
work_keys_str_mv |
AT heonyoungchang activedaysaroundsolarminimumandsolarcycleparameter |
_version_ |
1721475606281977856 |