Zobrazeno 1 - 10
of 33
pro vyhledávání: '"Harufumi Tamazawa"'
Publikováno v:
Acta Astronautica. 210:36-44
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6158b75c8ee5c7c1d465f21e3aba6dd6
https://doi.org/10.1016/j.actaastro.2023.04.048
https://doi.org/10.1016/j.actaastro.2023.04.048
Autor:
Harufumi TAMAZAWA
Publikováno v:
Proceedings of the International Astronomical Union. 15:336-338
The development of astronomy has been developed by the cooperation of amateur astronomers and researchers. Sunspot observation is a good example of Extreme citizen science in early days. Issei YAMAMOTO (1889–1959), organized “Oriental Astronomica
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7b969c3708a602789c55a520ba676f83
https://doi.org/10.1017/s1743921321000776
https://doi.org/10.1017/s1743921321000776
Autor:
Harufumi Tamazawa, Kiyomi Iwahashi, Akito Davis Kawamura, Hisashi Hayakawa, Yusuke Ebihara, Hiroaki Isobe
Publikováno v:
Space Weather. 15:1373-1382
Extremely bright aurora was witnessed in East Asia on 17 September 1770, according to historical documents. The aurora was described as “as bright as a night with full moon” at magnetic latitude of 25°. The aurora was dominated by red color exte
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::eeb9bfaab9865064b45b03a54321c0c7
https://doi.org/10.1002/2017sw001693
https://doi.org/10.1002/2017sw001693
Autor:
Hisashi Hayakawa, Tsuneyo Terashima, Hidehiko Suzuki, Hiroaki Isobe, Hiroko Miyahara, Kiyomi Iwahashi, Harufumi Tamazawa, Akito Davis Kawamura, Kazuaki Yamamoto, Takuji Nakamura, Yasunori Fujiwara, Ryuho Kataoka, Masako Takei
Publikováno v:
Space Weather. 15:392-402
Great magnetic storms are recorded as aurora sightings in historical documents. The earliest known example of “prolonged” aurora sightings, with aurora persistent for two or more nights within a seven-day interval at low latitudes, in Japan was d
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5a303fa37a1fc56d84a555ab8baf9c19
https://doi.org/10.1002/2016sw001493
https://doi.org/10.1002/2016sw001493
Publikováno v:
The Astrophysical Journal. 887:7
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:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ca972ee095da69fefede68cc30333c4f
https://doi.org/10.3847/1538-4357/ab107e
https://doi.org/10.3847/1538-4357/ab107e
Autor:
Harufumi Tamazawa, Masashi Fujiyama, Shinsuke Imada, Hisashi Hayakawa, Toshiki Kawai, Hideyuki Hotta, Haruhisa Iijima, Kazunari Shibata, Shin Toriumi, Kiyomi Iwahashi
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:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cfd1c439de71fef2bc9c172d9720c4e3
http://arxiv.org/abs/1804.08614
http://arxiv.org/abs/1804.08614
Publikováno v:
Solar Physics. 293
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:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c24e150727e73b8c731591e742ae8cd1
https://doi.org/10.1007/s11207-017-1213-1
https://doi.org/10.1007/s11207-017-1213-1
Autor:
Hiroaki Isobe, José M. Vaquero, Satoshi Hayakawa, Kentaro Hattori, Yoshikazu Watanabe, Víctor M. S. Carrasco, Kiyomi Iwahashi, Harufumi Tamazawa, Yusuke Ebihara, Hisashi Hayakawa, María Cruz Gallego, Akito Davis Kawamura
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:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5f162123a68e856fa26cadcc64081094
Autor:
Harufumi Tamazawa, Hiroko Miyahara, Hisashi Hayakawa, Yusuke Ebihara, Hiroaki Isobe, Akito Davis Kawamura, Tadanobu Aoyama
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:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::44c924c42f662f0128fdc3b94b0af4d7
http://arxiv.org/abs/1705.02238
http://arxiv.org/abs/1705.02238
Autor:
Akito Davis Kawamura, Hisashi Hayakawa, Asuka Tsukamoto, Yusuke Ebihara, Harufumi Tamazawa, Hiroaki Isobe
Publikováno v:
Publications of the Astronomical Society of Japan. 69
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:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3c11b34331228f53128770f87d178dcf
https://doi.org/10.1093/pasj/psw132
https://doi.org/10.1093/pasj/psw132