Zobrazeno 1 - 10
of 21
pro vyhledávání: '"Koichiro Oyama"'
Publikováno v:
Remote Sensing, Vol 15, Iss 18, p 4556 (2023)
This paper discusses the relationship between the vertical ground motion and ionospheric disturbances before the Kumamoto earthquake on 16 April 2016, in Kyushu, Japan, using the vertical ground motion measured by slant gauges widely distributed in K
Externí odkaz:
https://doaj.org/article/69298580313f44d88df58e7bb5695c1c
Autor:
Koichiro Oyama
Publikováno v:
Journal of Astronomy and Space Sciences, Vol 32, Iss 3, Pp 167-180 (2015)
Herein, we discuss the in situ measurement of the electron temperature in the ionosphere/plasmasphere by means of DC Langmuir probes. Major instruments which have been reported are a conventional DC Langmuir probe, whose probe voltage is swept; a p
Externí odkaz:
https://doaj.org/article/5f67f45d28a34f2399ae6539c82622b2
Publikováno v:
Antarctic Record, Iss 52, Pp 78-91 (1975)
In plasma diagnosis by means of a Langmuir probe, contamination of the electrode is a quite serious problem. In order to get reliable data of space plasma, cleaning of the electrode is an essential requirement. The instrument which is not influenced
Externí odkaz:
https://doaj.org/article/e9c2853c3515400dbab4b3d12bd922f3
Autor:
Koichiro OYAMA, Iwane KIMURA
Publikováno v:
Antarctic Record, Iss 69, Pp 74-75 (1980)
The results of observation of ionospheric electron temperature by means of a small standard electron temperature probe on board the S-310JA-2 rocket are presented briefly.
Externí odkaz:
https://doaj.org/article/5813ebd12ca24b308db372b8d232caf7
Autor:
Koichiro Oyama, L. Bankov, D. Minakshi, Chia-Hung Chen, Kwangsun Ryu, Jann-Yenq Liu, Huixin Liu
Publikováno v:
Advances in Space Research. 63:2623-2637
Ionosphere disturbance which was seen prior to an earthquake which occurred on 11 March 2011 off the coast of Tohoku was studied. Ionosphere data which were used are: O+ density acquired with US satellite DMSP, and NmF2, h’F, and fmin obtained by i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5ae62093e1db6e60a253c8e1b82d0826
https://doi.org/10.1016/j.asr.2018.12.042
https://doi.org/10.1016/j.asr.2018.12.042
Autor:
Dorota Przepiórka, Barbara Matyjasiak, Hanna Rothkaehl, C. Y. Chen, Kwangsun Ryu, Loren C. Chang, I. T. Lee, Tiger J.Y. Liu, Koichiro Oyama
Publikováno v:
Journal of Geophysical Research: Space Physics. 123:5917-5932
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fd1ac68a64caf68668e45b348d136754
https://doi.org/10.1029/2017ja024840
https://doi.org/10.1029/2017ja024840
Publikováno v:
Natural Hazards and Earth System Sciences, Vol 11, Iss 6, Pp 1759-1768 (2011)
One of the possible candidates which modifies the ionosphere before large earthquake is electric field. We presume that the electric field associated with large earthquakes is generated in the ionosphere dynamo region (100–120 km). This paper tries
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ab67996d08599d73b2bd7b623998a1e8
http://www.nat-hazards-earth-syst-sci.net/11/1759/2011/nhess-11-1759-2011.pdf
http://www.nat-hazards-earth-syst-sci.net/11/1759/2011/nhess-11-1759-2011.pdf
Publikováno v:
AIP Advances, Vol 8, Iss 10, Pp 105220-105220-13 (2018)
The DC Langmuir probe is a widely-used instrument for the plasma measurement in the space missions. But to apply DC Langmuir probe to a tiny satellite, such as a cubesat, for ionosphere study is difficult to get accurate electron density (ne) and ele
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::180c33c719f301382ad60ffa82249034
https://doi.org/10.1063/1.5052489
https://doi.org/10.1063/1.5052489
Publikováno v:
The Review of scientific instruments. 86(8)
A compact and low power consumption instrument for measuring the electron density and temperature in the ionosphere has been developed by modifying the previously developed Electron Temperature Probe (ETP). A circuit block which controls frequency of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0497af6ebf93b9b1f599f42695728878
https://pubmed.ncbi.nlm.nih.gov/26329217
https://pubmed.ncbi.nlm.nih.gov/26329217
Publikováno v:
Plasma Sources Science and Technology. 26:115010
To produce ionospheric plasma environments at ground level is essential to get information not only for the development of CubeSat-class spacecraft but also for the design of ionospheric plasma instruments and to confirm their performance. In this pa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e040ae2a8c51636863bf444af98e51f7
https://doi.org/10.1088/1361-6595/aa92fc
https://doi.org/10.1088/1361-6595/aa92fc