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  1. No Access

    Article

    Iwahashi Zenbei’s Sunspot Drawings in 1793 in Japan

    Three Japanese sunspot drawings associated with Iwahashi Zenbei (1756 – 1811) are shown here from contemporary manuscripts and woodprint documents with the relevant texts. We reveal the observational date of o...

    Hisashi Hayakawa, Kiyomi Iwahashi, Harufumi Tamazawa, Shin Toriumi… in Solar Physics (2018)

  2. No Access

    Article

    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 ray event has no...

    Hisashi Hayakawa, Harufumi Tamazawa, Yurina Uchiyama, Yusuke Ebihara… in Solar Physics (2016)

  3. Article

    Open Access

    Earliest datable records of aurora-like phenomena in the astronomical diaries from Babylonia

    The astronomical diaries from Babylonia (ADB) are excellent sources of information of natural phenomena, including astronomical ones, in pre-Christ era because it contains the record of highly continuous and s...

    Hisashi Hayakawa, Yasuyuki Mitsuma, Yusuke Ebihara… in Earth, Planets and Space (2016)

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  4. Article

    Open Access

    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    Records of sunspot and aurora observations in pre-telescopic historical documents can provide useful information about solar activity in the past.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, as they ma...

    Hisashi Hayakawa, Harufumi Tamazawa, Akito Davis Kawamura… in Earth, Planets and Space (2015)

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