Auroras on Earth are closely linked to solar activity,offering a valuable way to investigate variations in solar activity,particularly for periods when solar activity data are scarce.This study compares and analyzes a...Auroras on Earth are closely linked to solar activity,offering a valuable way to investigate variations in solar activity,particularly for periods when solar activity data are scarce.This study compares and analyzes auroral records from Korean Peninsula and mid-latitude Europe between 1610 and 1810 AD.Both Korean and European aurora records show consistency between auroral activity and solar variations,with distinct advantages in different periods.Before 1700 AD,Korean auroral observations were more frequent than European auroras and aligned well with solar activity proxies,making them particularly useful for studying solar variability during the Maunder Minimum.After 1700 AD,European auroral records became more abundant than Korean auroral records and consistent with solar activity,providing better insights into post-Maunder Minimum solar variations and long-term solar activity trends.Thus,Korean and European auroral data complement each other,enhancing our understanding of historical solar activity.展开更多
Whether the solar activity was very low, and especially whether the solar cycle existed, during the Maunder Minimum (1645-1715 AD), have been disputed for a long time. In this paper we use the Guliya NO3 data, which c...Whether the solar activity was very low, and especially whether the solar cycle existed, during the Maunder Minimum (1645-1715 AD), have been disputed for a long time. In this paper we use the Guliya NO3 data, which can reflect the solar activity, to analyze the characteristics of the solar activity during the Maunder Minimum. The results show that the solar activity was indeed low, and solar cycle displayed normal as present, i.e. about 11 a, in that period. Moreover, it was found that the solar activity contains a 36-year periodic component probably, which might be related to the variations in the length of the sunspot cycle. This finding is of importance for the study of the relationship between the sun variability and the Earth climate change.展开更多
Solar cycles are fundamental to astrophysics,space exploration,technological infrastructure,and Earth's climate.A better understanding of these cycles and their history can aid in risk mitigation on Earth,while al...Solar cycles are fundamental to astrophysics,space exploration,technological infrastructure,and Earth's climate.A better understanding of these cycles and their history can aid in risk mitigation on Earth,while also deepening our knowledge of stellar physics and solar system dynamics.Determining the solar cycles between 1600 and 1700-especially the post-1645 Maunder Minimum,characterized by significantly reduced solar activity-poses challenges to existing solar activity proxies.This study utilizes a new red equatorial auroral catalog from ancient Korean texts to establish solar cycle patterns from 1623 to 1700.Remarkably,a further reevaluation of the solar cycles between 1610 and 1755 identified a total of 13 cycles,diverging from the widely accepted record of 12 cycles during that time.This research enhances our understanding of historical solar activity,and underscores the importance of integrating diverse historical sources into modern analyses.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.42404185,42388101,42241106,42222408,42074207)supported by the Specialized Research Fund for State Key Laboratories。
文摘Auroras on Earth are closely linked to solar activity,offering a valuable way to investigate variations in solar activity,particularly for periods when solar activity data are scarce.This study compares and analyzes auroral records from Korean Peninsula and mid-latitude Europe between 1610 and 1810 AD.Both Korean and European aurora records show consistency between auroral activity and solar variations,with distinct advantages in different periods.Before 1700 AD,Korean auroral observations were more frequent than European auroras and aligned well with solar activity proxies,making them particularly useful for studying solar variability during the Maunder Minimum.After 1700 AD,European auroral records became more abundant than Korean auroral records and consistent with solar activity,providing better insights into post-Maunder Minimum solar variations and long-term solar activity trends.Thus,Korean and European auroral data complement each other,enhancing our understanding of historical solar activity.
文摘Whether the solar activity was very low, and especially whether the solar cycle existed, during the Maunder Minimum (1645-1715 AD), have been disputed for a long time. In this paper we use the Guliya NO3 data, which can reflect the solar activity, to analyze the characteristics of the solar activity during the Maunder Minimum. The results show that the solar activity was indeed low, and solar cycle displayed normal as present, i.e. about 11 a, in that period. Moreover, it was found that the solar activity contains a 36-year periodic component probably, which might be related to the variations in the length of the sunspot cycle. This finding is of importance for the study of the relationship between the sun variability and the Earth climate change.
基金supported by the National Natural Science Foundation of China (42388101)the CAS Youth Interdisciplinary Team (JCTD-2021-05)funded by the Youth Innovation Promotion Association, Chinese Academy of Sciences.
文摘Solar cycles are fundamental to astrophysics,space exploration,technological infrastructure,and Earth's climate.A better understanding of these cycles and their history can aid in risk mitigation on Earth,while also deepening our knowledge of stellar physics and solar system dynamics.Determining the solar cycles between 1600 and 1700-especially the post-1645 Maunder Minimum,characterized by significantly reduced solar activity-poses challenges to existing solar activity proxies.This study utilizes a new red equatorial auroral catalog from ancient Korean texts to establish solar cycle patterns from 1623 to 1700.Remarkably,a further reevaluation of the solar cycles between 1610 and 1755 identified a total of 13 cycles,diverging from the widely accepted record of 12 cycles during that time.This research enhances our understanding of historical solar activity,and underscores the importance of integrating diverse historical sources into modern analyses.
