Zobrazeno 1 - 10
of 69
pro vyhledávání: '"Tamazawa, Harufumi"'
Autor:
Takanashi, Naohiro, Hiramatsu, Masaaki, Kawagoe, Shio, Kusakabe, Nobuhiko, Sawada, Koki, Tamazawa, Harufumi
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 received. Based on this data, we present what kind of interest the gene
Externí odkaz:
http://arxiv.org/abs/2312.13402
Publikováno v:
In Acta Astronautica September 2023 210:36-44
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 minima, since the beginning of telescopic observations of sunspots, is
Externí odkaz:
http://arxiv.org/abs/1903.08466
Autor:
Hayakawa, Hisashi, Ebihara, Yusuke, Vaquero, José M., Hattori, Kentaro, Carrasco, Víctor M. S., Gallego, María de la Cruz, Hayakawa, Satoshi, Watanabe, Yoshikazu, Iwahashi, Kiyomi, Tamazawa, Harufumi, Kawamura, Akito D., Isobe, Hiroaki
Publikováno v:
Astronomy & Astrophysics, 2018
Aims. Historical records provide evidence of extreme magnetic storms with equatorward auroral extensions before the epoch of systematic magnetic observations. One significant magnetic storm occurred on February 15, 1730. We scale this magnetic storm
Externí odkaz:
http://arxiv.org/abs/1807.06496
Autor:
Hayakawa, Hisashi, Iwahashi, Kiyomi, Fujiyama, Masashi, Kawai, Toshiki, Toriumi, Shin, Hotta, Hideyuki, Iijima, Haruhisa, Imada, Shinsuke, Tamazawa, Harufumi, Shibata, Kazunari
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 Kansei irai Jissoku Zusetsu (Charts of Three Worlds and Diagrams of Actu
Externí odkaz:
http://arxiv.org/abs/1804.08614
Three Japanese sunspot drawings associated with Iwahashi Zenbei (1756-1811) are shown here from contemporary manuscripts and woodprint documents with the relevant texts. We revealed the observational date of one of the drawings to be 26 August 1793,
Externí odkaz:
http://arxiv.org/abs/1711.08143
Autor:
Hayakawa, Hisashi, Iwahashi, Kiyomi, Ebihara, Yusuke, Tamazawa, Harufumi, Shibata, Kazunari, Knipp, Delores J., Kawamura, Akito Davis, Hattori, Kentaro, Mase, Kumiko, Nakanishi, Ichiro, Isobe, Hiroaki
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 September 1770 are considered to manifest one of the greatest storms.
Externí odkaz:
http://arxiv.org/abs/1711.00690
Autor:
Hayakawa, Hisashi, Iwahashi, Kiyomi, Tamazawa, Harufumi, Ebihara, Yusuke, Kawamura, Akito Davis, Isobe, Hiroaki, Namiki, Katsuko, Shibata, Kazunari
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 solar and auroral activities. In total, we found one sunspot record a
Externí odkaz:
http://arxiv.org/abs/1708.01045
Autor:
Hayakawa, Hisashi, Tamazawa, Harufumi, Ebihara, Yusuke, Miyahara, Hiroko, Kawamura, Akito Davis, Aoyama, Tadanobu, Isobe, Hiroaki
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 weather events. In this study, we present the results of a compr
Externí odkaz:
http://arxiv.org/abs/1705.02238
Autor:
Tamazawa, Harufumi, Kawamura, Akito Davis, Hayakawa, Hisashi, Tsukamoto, Asuka, Isobe, Hiroaki, Ebihara, Yusuke
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 and low-latitude auroras in historical documents in pre-telescopic age
Externí odkaz:
http://arxiv.org/abs/1612.03283