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  • Oyama Koichiro

Back-diffusion plasma generator for ionosphere study

Fang, H. K., Oyama, K. I. & Chen, A. B., 2017 Oct 31, In : Plasma Sources Science and Technology. 26, 11, 115010.

Research output: Contribution to journalArticle

2 Citations (Scopus)

DC Langmuir probe for measurement of space plasma: A brief review

Oyama, K., 2015 Jan 1, In : Journal of Astronomy and Space Sciences. 32, 3, p. 167-180 14 p.

Research output: Contribution to journalReview article

Open Access
5 Citations (Scopus)

Detection of long-living neutral hydrated clusters in laboratory simulation of ionospheric D region plasma

Sinha, H. S. S., Koichiro, O. & Watanabe, S., 2013 Jan 1, In : Journal of Geophysical Research: Space Physics. 118, 1, p. 583-589 7 p.

Research output: Contribution to journalArticle

Open Access
1 Citation (Scopus)

Dual-spacecraft radio occultation measurement of the electron density near the lunar surface by the SELENE mission

Ando, H., Imamura, T., Nabatov, A., Futaana, Y., Iwata, T., Hanada, H., Matsumoto, K., Mochizuki, N., Kono, Y., Noda, H., Liu, Q., Koichiro, O., Yamamoto, Z. & Saito, A., 2012 Jan 1, In : Journal of Geophysical Research: Space Physics. 117, 8, A08313.

Research output: Contribution to journalArticle

7 Citations (Scopus)

Earthquake induced dynamics at the ionosphere in presence of magnetic storm

Devi, M., Barbara, A. K., Oyama, K. I. & Chen, C. H., 2014 Feb 15, In : Advances in Space Research. 53, 4, p. 609-618 10 p.

Research output: Contribution to journalArticle

11 Citations (Scopus)

Effect of finite electrode area ratio on high-frequency Langmuir probe measurements

Shimoyama, M., Koichiro, O., Abe, T. & Yau, A. W., 2012 Feb 22, In : Journal of Physics D: Applied Physics. 45, 7, 075205.

Research output: Contribution to journalArticle

5 Citations (Scopus)

Electron temperature and density probe for small aeronomy satellites

Oyama, K. I., Hsu, Y. W., Jiang, G. S., Chen, W. H., Cheng, C. Z., Fang, H. K. & Liu, W. T., 2015 Aug 1, In : Review of Scientific Instruments. 86, 8, 084703.

Research output: Contribution to journalArticle

7 Citations (Scopus)

Ionospheric electron content and NmF2 from nighttime OI 135.6 nm intensity

Rajesh, P. K., Liu, J. Y., Hsu, M. L., Lin, C. H., Oyama, K. I. & Paxton, L. J., 2011 Jan 1, In : Journal of Geophysical Research: Space Physics. 116, 2, A02313.

Research output: Contribution to journalArticle

5 Citations (Scopus)

Ionospheric plasma caves under the equatorial ionization anomaly

Lee, I. T., Liu, J. Y., Lin, C. H., Oyama, K. I., Chen, C. Y. & Chen, C. H., 2012 Dec 3, In : Journal of Geophysical Research: Space Physics. 117, 11, A11309.

Research output: Contribution to journalArticle

6 Citations (Scopus)

Ionospheric response to 2009 sudden stratospheric warming in the Northern Hemisphere

Oyama, K. I., Jhou, J. T., Lin, J. T., Lin, C., Liu, H. & Yumoto, K., 2014 Dec, In : Journal of Geophysical Research: Space Physics. 119, 12, p. 10,260-10,275

Research output: Contribution to journalArticle

10 Citations (Scopus)

Latitudinal distribution of anomalous ion density as a precursor of a large earthquake

Koichiro, O., Kakinami, Y., Liu, J. Y., Abdu, M. A. & Cheng, C-Z., 2011 Jan 1, In : Journal of Geophysical Research: Space Physics. 116, 4, A04319.

Research output: Contribution to journalArticle

36 Citations (Scopus)

Means to remove electrode contamination effect of Langmuir probe measurement in space

Oyama, K. I., Lee, C. H., Fang, H. K. & Cheng, C. Z., 2012 May 1, In : Review of Scientific Instruments. 83, 5, 055113.

Research output: Contribution to journalReview article

15 Citations (Scopus)

Modifications of the ionosphere prior to large earthquakes: report from the Ionosphere Precursor Study Group

Oyama, K. I., Devi, M., Ryu, K., Chen, C. H., Liu, J. Y., Liu, H., Bankov, L. & Kodama, T., 2016 Dec 1, In : Geoscience Letters. 3, 1, 6.

Research output: Contribution to journalArticle

8 Citations (Scopus)

Multisatellite observations of an intensified equatorial ionization anomaly in relation to the northern Sumatra earthquake of March 2005

Ryu, K., Lee, E., Chae, J. S., Parrot, M. & Oyama, K. I., 2014 Jun, In : Journal of Geophysical Research: Space Physics. 119, 6, p. 4767-4785 19 p.

Research output: Contribution to journalArticle

14 Citations (Scopus)

Plasma measurements in the space plasma operation chamber (SPOC)

Fang, K., Oyama, K. I. & Cheng, C. Z., 2015 Jan 1, In : Chinese Journal of Physics. 53, 1, p. 1-30 30 p.

Research output: Contribution to journalArticle

3 Citations (Scopus)

Possible interaction between thermal electrons and vibrationally excited N2 in the lower E-region

Oyama, K. I., Shimoyama, M., Liu, J. Y. & Cheng, C. Z., 2011 Apr 4, In : Annales Geophysicae. 29, 3, p. 583-590 8 p.

Research output: Contribution to journalArticle

Open Access
8 Citations (Scopus)

Precursor effect of March 11, 2011 off the coast of Tohoku earthquake on high and low latitude ionospheres and its possible disturbing mechanism

Oyama, K. I., Chen, C. H., Bankov, L., Minakshi, D., Ryu, K., Liu, J. Y. & Liu, H., 2019 Apr 15, In : Advances in Space Research. 63, 8, p. 2623-2637 15 p.

Research output: Contribution to journalArticle

3 Citations (Scopus)

Precursory enhancement of EIA in the morning sector: Contribution from mid-latitude large earthquakes in the north-east Asian region

Ryu, K., Oyama, K. I., Bankov, L., Chen, C. H., Devi, M., Liu, H. & Liu, J. Y., 2016 Jan 1, In : Advances in Space Research. 57, 1, p. 268-280 13 p.

Research output: Contribution to journalArticle

9 Citations (Scopus)

Radio occultation measurement of the electron density near the lunar surface using a subsatellite on the SELENE mission

Imamura, T., Nabatov, A., Mochizuki, N., Iwata, T., Hanada, H., Matsumoto, K., Noda, H., Kono, Y., Liu, Q., Futaana, Y., Ando, H., Yamamoto, Z., Koichiro, O. & Saito, A., 2012 Jan 1, In : Journal of Geophysical Research: Space Physics. 117, 6, A06303.

Research output: Contribution to journalArticle

12 Citations (Scopus)

Role of Equatorial Anomaly in Earthquake time precursive features: A few strong events over West Pacific zone

Devi, M., Patgiri, S., Barbara, A. K., Oyama, K. I., Ryu, K., Depuev, V. & Depueva, A., 2018 Mar 15, In : Advances in Space Research. 61, 6, p. 1444-1455 12 p.

Research output: Contribution to journalArticle

1 Citation (Scopus)

Space demonstration of bare electrodynamic tape-tether technology on the sounding rocket S520-25

Fujii, H. A., Watanabe, T., Sahara, H., Kojima, H., Takehara, S., Yamagiwa, Y., Sasaki, S., Abe, T., Tanaka, K., Oyama, K., Johnson, L., Khazanov, G. V., Sanmartin, J. R., Charro, M., Kruijff, M., van der Heide, E. J., Rubin, B., de Quiros, F. J. G., Trivailo, P. M. & Williams, P., 2011 Dec 1, AIAA Guidance, Navigation, and Control Conference 2011. (AIAA Guidance, Navigation, and Control Conference 2011).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

23 Citations (Scopus)

Suprathermal plasma analyzer for the measurement of low-energy electron distribution in the ionosphere

Shimoyama, M., Koichiro, O., Abe, T. & Yau, A. W., 2011 Jul 1, In : Review of Scientific Instruments. 82, 7, 074501.

Research output: Contribution to journalArticle

2 Citations (Scopus)

Suspected seismo-ionospheric coupling observed by satellite measurements and GPS TEC related to the M7.9 Wenchuan earthquake of 12 May 2008

Ryu, K., Parrot, M., Kim, S. G., Jeong, K. S., Chae, J. S., Pulinets, S. & Oyama, K. I., 2014 Dec, In : Journal of Geophysical Research: Space Physics. 119, 12, p. 10,305-10,323

Research output: Contribution to journalArticle

15 Citations (Scopus)

The effect of surface contamination of tiny satellite on DC probe ionosphere measurement

Fang, H. K., Chen, W. H., Chen, A. B. & Oyama, K. I., 2018 Oct 1, In : AIP Advances. 8, 10, 105220.

Research output: Contribution to journalArticle

The Midlatitude Trough and the Plasmapause in the Nighttime Ionosphere Simultaneously Observed by DEMETER During 2006–2009

Chen, C. Y., Liu, T. J. Y., Lee, I. T., Rothkaehl, H., Przepiorka, D., Chang, L. C., Matyjasiak, B., Ryu, K. & Oyama, K. I., 2018 Jul, In : Journal of Geophysical Research: Space Physics. 123, 7, p. 5917-5932 16 p.

Research output: Contribution to journalArticle

4 Citations (Scopus)

The neutral temperature in the ionospheric dynamo region and the ionospheric F region density during Wenchuan and Pingtung Doublet earthquakes

Sun, Y. Y., Oyama, K. I., Liu, J. Y., Jhuang, H. K. & Cheng, C. Z., 2011 Jul 18, In : Natural Hazards and Earth System Science. 11, 6, p. 1759-1768 10 p.

Research output: Contribution to journalArticle

Open Access
12 Citations (Scopus)

Topside ionospheric electron temperature and density along the Weddell Sea latitude

Liu, J. Y., Chang, F. Y., Oyama, K. I., Kakinami, Y., Yeh, H. C., Yeh, T. L., Jiang, S. B. & Parrot, M., 2015 Jan, In : Journal of Geophysical Research: Space Physics. 120, 1, p. 609-614 6 p.

Research output: Contribution to journalArticle

Open Access
10 Citations (Scopus)