61 citations · 420 across the 16 of their papers we have counts for
16 papers
Survey of public attitudes toward astronomy in Japan
Naohiro Takanashi, Masaaki Hiramatsu, Shio Kawagoe +3
We report on the results of a survey we conducted on the Japanese public's attitudes toward astronomy. This survey was conducted via an online questionnaire, with 2,000 responses r…
Intense geomagnetic storm during Maunder minimum possibly by a quiescent filament eruption
Hiroaki Isobe, Yusuke Ebihara, Akito D. Kawamura +2
The sun occasionally undergoes the so-called grand minima, in which its magnetic activity, measured by the number of sunspots, is suppressed for decades. The most prominent grand m…
A Great Space Weather Event in February 1730
Hisashi Hayakawa, Yusuke Ebihara, José M. Vaquero +9
Aims. Historical records provide evidence of extreme magnetic storms with equatorward auroral extensions before the epoch of systematic magnetic observations. One significant magne…
Sunspot Drawings by Japanese Official Astronomers in 1749-1750
Hisashi Hayakawa, Kiyomi Iwahashi, Masashi Fujiyama +7
Sunspot observations with telescopes in 18th century were carried out in Japan as well. One of these sunspot observations is recorded in an account called Sansaizusetsu narabini Ka…
Iwahashi Zenbei's Sunspot Drawings in 1793 in Japan
Hisashi Hayakawa, Kiyomi Iwahashi, Harufumi Tamazawa +2
Three Japanese sunspot drawings associated with Iwahashi Zenbei (1756-1811) are shown here from contemporary manuscripts and woodprint documents with the relevant texts. We reveale…
Long-Lasting Extreme Magnetic Storm Activities in 1770 Found in Historical Documents
Hisashi Hayakawa, Kiyomi Iwahashi, Yusuke Ebihara +8
Dim red aurora at low magnetic latitudes is a visual and recognized manifestation of geomagnetic storms. The great low-latitude auroral displays seen throughout East Asia on 16-18…
Records of Auroral Candidates and Sunspots in Rikkokushi, Chronicles of Ancient Japan from Early 7th Century to 887
Hisashi Hayakawa, Kiyomi Iwahashi, Harufumi Tamazawa +5
In this article, we present the results of the surveys on sunspots and auroral candidates in Rikkokushi, Japanese Official Histories from the early 7th century to 887 to review the…
Records of Sunspots and Aurora Candidates in the Chinese Official Histories of the Yuán and Míng Dynasties during 1261-1644
Hisashi Hayakawa, Harufumi Tamazawa, Yusuke Ebihara +4
Records of observations of sunspots and auroras in pre-telescopic historical documents provide useful information about past solar activity both in long-term trends and short-term…
Records of sunspot and aurora activity during 581-959 CE in Chinese official histories in the periods of Suí, Táng, and the Five Dynasties and Ten Kingdoms
Harufumi Tamazawa, Akito Davis Kawamura, Hisashi Hayakawa +3
Recent studies of radioisotopes in tree rings or ice cores suggest that extreme space weather events occurred in the pre-telescope age. Observational records of naked-eye sunspots…
Historical Auroras in the 990s: Evidence for Great Magnetic Storms
Hisashi Hayakawa, Harufumi Tamazawa, Yurina Uchiyama +5
Recently, a significant carbon-14 enhancement in the year 994 in tree rings has been found, suggesting an extremely large cosmic ray flux event during a short period. The origin of…
Earliest Datable Records of Aurora-like Phenomena in the Astronomical Diaries from Babylonia
Hisashi Hayakawa, Yasuyuki Mitsuma, Yusuke Ebihara +4
The Astronomical Diaries from Babylonia (ADB) are an excellent source of information of natural phenomena, including astronomical ones, in pre-Christ era because it contains the re…
The earliest drawings of datable auroras and a two-tail comet from the Syriac Chronicle of Zūqnīn
Hisashi Hayakawa, Yasuyuki Mitsuma, Yasunori Fujiwara +7
People have probably been watching the sky since the beginning of human history. Observers in pre-telescopic ages recorded anomalous events and these astronomical records in the hi…
East Asian Observations of Low Latitude Aurora during the Carrington Magnetic Storm
Hisashi Hayakawa, Kiyomi Iwahashi, Harufumi Tamazawa +6
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…
Aurora Candidates from the Chronicle of Qīng Dynasty in Several Degrees of Relevance
Akito D. Kawamura, Hisashi Hayakawa, Harufumi Tamazawa +2
We present the result of the survey of sunspots and auroras in , the draft chronicle of dynasty, for the p…
"Unusual Rainbow and White Rainbow" A new auroral candidate in oriental historical sources
Hisashi Hayakawa, Hiroaki Isobe, Akito Davis Kawamura +3
Solar activity has been recorded as auroras or sunspots in various historical sources. These records are of much importance for investigating both long-term solar activities and ex…
Records of sunspot and aurora during CE 960-1279 in the Chinese chronicle of the Song dynasty
Hisashi Hayakawa, Harufumi Tamazawa, Akito D Kawamura +1
Records of sunspots and aurora observations in pre-telescopic historical documents can provide useful information about solar activity in the past. This is also true for extreme sp…