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Records of sunspot and aurora during CE 960–1279 in the Chinese chronicle of the Sòng dynasty
Records of sunspot and aurora observations in pre-telescopic historical documents can provide useful information about solar activity in the past. This is also true for extreme space weather events,Expand
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Temporal and Spatial Evolutions of a Large Sunspot Group and Great Auroral Storms Around the Carrington Event in 1859
This research was conducted under the support of the Grant-in-Aid from the Ministry of Education, Culture, Sports, Science and Technology of Japan, Grant Number JP15H05814 (PI: K. Ichimoto),Expand
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The Great Space Weather Event during 1872 February Recorded in East Asia
The study of historical great geomagnetic storms is crucial for assessing the possible risks to the technological infrastructure of a modern society, caused by extreme space-weather events. TheExpand
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Records of sunspots and aurora candidates in the Chinese official histories of the Yuán and Míng dynasties during 1261–1644
Records of observations of sunspots and auroras in pre-telescopic historical documents provide useful information about past solar activity both in long-term trends and short-term space weatherExpand
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Historical Auroras in the 990s: Evidence of Great Magnetic Storms
A significant carbon-14 enhancement has recently been found in tree rings for the year 994, suggesting an extremely strong and brief cosmic ray flux event. The origin of this particular cosmic rayExpand
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Low-Latitude Aurorae during the Extreme Space Weather Events in 1859.
The Carrington storm (September 1/2, 1859) is one of the largest magnetic storms ever observed and it has caused global auroral displays in low-latitude areas, together with a series of multipleExpand
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East Asian Observations of Low Latitude Aurora during the Carrington Magnetic Storm
The magnetic storm around 1859 September 2, caused by so-called Carrington flare, was the most intense in the history of modern scientific observations, and hence is considered to be the benchmarkExpand
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Lifetimes and Emergence/Decay Rates of Star Spots on Solar-type Stars Estimated by Kepler Data in Comparison with Those of Sunspots
Active solar-type stars show large quasi-periodic brightness variations caused by stellar rotations with star spots, and the amplitude changes as the spots emerge and decay. The Kepler data areExpand
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