Zobrazeno 1 - 10
of 34
pro vyhledávání: '"Kazuyuki Hakamada"'
Publikováno v:
Journal of Geophysical Research: Space Physics. 123:2520-2534
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7788e7010f1f01b4014bb2dbb1327254
https://doi.org/10.1002/2017ja025014
https://doi.org/10.1002/2017ja025014
Autor:
Kazuyuki Hakamada
Publikováno v:
Solar Physics. 283:247-252
The Sun’s general magnetic field has shown polarity reversal three times during the last three solar cycles. We attempt to estimate the upcoming polarity reversal time of the solar magnetic dipole by using the coronal field model and synoptic data
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a2c6a29debc3cc862b5289d3417165d5
https://doi.org/10.1007/s11207-013-0238-3
https://doi.org/10.1007/s11207-013-0238-3
Autor:
Tomoya Iju, Daiki Satonaka, H. Nakano, Kazuyuki Hakamada, Ken'ichi Fujiki, Tomoya Shimoyama, Masayoshi Kojima, Munetoshi Tokumaru
Publikováno v:
AIP Conference Proceedings.
Ground-based observations of the solar wind using interplanetary scintillation (IPS) have been regularly performed since 1980s at the Solar-Terrestrial Environment Laboratory of Nagoya University using the 327-MHz multi-station system. It has been re
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::52c69660e1b6944cb1257c413e5158d8
https://doi.org/10.1063/1.4943827
https://doi.org/10.1063/1.4943827
We have studied the relationship between the solar-wind speed $[V]$ and the coronal magnetic-field properties (a flux expansion factor [$f$] and photospheric magnetic-field strength [$B_{\mathrm{S}}$]) at all latitudes using data of interplanetary sc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c4e032525be9fd349f5dc373a71989d3
Publikováno v:
Solar Physics. 227:387-399
Thirteen synoptic maps of expansion rate of the coronal magnetic field (CMF; RBR) calculated by the so-called ‘potential model’ are constructed for 13 Carrington rotations from the maximum phase of solar activity cycle 22 through the maximum phas
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b59bda36b716b2001a0cd5d1f2558443
https://doi.org/10.1007/s11207-005-3304-7
https://doi.org/10.1007/s11207-005-3304-7
Autor:
Kazuyuki Hakamada, Masayoshi Kojima, Masahiro Yamashita, Daisuke Baba, M. Hirano, Munetoshi Tokumaru, Ken'ichi Fujiki
Publikováno v:
Advances in Space Research. 35:2185-2188
Different kinds of coronal holes are sources of different kind of solar winds. A successful solar wind acceleration model should be able to explain all those solar winds. For the modeling it is important to find a universal relation between the solar
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::121329b10489e76d312d0d1d313b7951
https://doi.org/10.1016/j.asr.2005.05.057
https://doi.org/10.1016/j.asr.2005.05.057
Publikováno v:
Advances in Space Research. 33:689-695
The origin and location of the slow wind are interesting subjects on their own and also they are important in the matter of the origin of the fast wind especially if the slow wind originates directly from a coronal hole. We have been studying the sol
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c89be9e7cb63824aff94fbaa18c1c900
https://doi.org/10.1016/s0273-1177(03)00238-2
https://doi.org/10.1016/s0273-1177(03)00238-2
Publikováno v:
Solar Physics. 207:173-185
Relationships between solar wind speed and expansion rate of the coronal magnetic field have been studied mainly by in-ecliptic observations of artificial satellites and some off-ecliptic data by Ulysses. In this paper, we use the solar wind speed es
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5bb754bf6dceb485d89586f697d72969
https://doi.org/10.1023/a:1015511805863
https://doi.org/10.1023/a:1015511805863
Publikováno v:
Solar Physics. 292:41-41
We investigate the relation between coronal hole (CH) areas and solar wind speeds during 1995 – 2011 using the potential field (PF) model analysis of magnetograph observations and interplanetary scintillation (IPS) observations by the Institute for
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cdc2caccc2a6b1dc42effab2daa87240
https://nagoya.repo.nii.ac.jp/records/23454
https://nagoya.repo.nii.ac.jp/records/23454
Publikováno v:
Journal of Geophysical Research: Space Physics. 106:24923-24935
The tomographic analysis of interplanetary scintillation (IPS) showed that low-speed winds (< 370 km s -1 ) emanated out from the polar region at the last solar activity maximum. In order to investigate the origin of those low-speed winds, we compare
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a591bbf387fa5a6bba662c8d70619906
https://doi.org/10.1029/2001ja900094
https://doi.org/10.1029/2001ja900094