Welcome
Low frequency (LF) and very low frequency (VLF) radio waves propagate between earth's surface and lower edge of ionosphere (70-90km, approx.) at long distance.
As modification of the lower ionosphere causes changes in received signal amplitude and phase, LF/VLF radio observation is a useful probe to detect variation of electron density in the lower ionosphere.
We have constructed radio observation network from low to high latitudes. Scientific targets of this network are
Energetic particle precipitation from radiation belts
Lightning effects on upper and middle atmospheres.
Solar X-ray flare and proton event effect on upper and middle atmospheres.
Effects of solar eclipse, atmospheric gravity waves, and sound wave on the lower ionosphere
Detection of gamma ray burst
Data
Archive
Document
PI: Fuminori Tsuchiya (Tohoku-U) tsuchiya _at_ pparc.gp.tohoku.ac.jp
Co-I: Hiroyo Ohya (Chiba-U) ohya _at_ faculty.chiba-u.jp
Co-I (database): Manabu Yagi (Kobe-U)
Station list
| Code | Location | Latitude | Longitude | Antenna | Data format |
| ATH | Athabasca/Canada | 54.7 | 246.7 | LF4060 | Ver2.0(10-10-24 -) |
| KAG | Kagoshima/Japan | 43.45 | 143.77 | LFL1010 | Ver2.0(16-12-20 -) |
| NYA | Ny-Alseund/Norway | 78.933 | 11.867 | LF4060 | Ver2.0(10-03-07 -) |
| PKR | Pokar Flat/AK USA | 65.125 | 212.512 | DXonePro | Ver2.0(14-10-17 -) |
| PTK | Pontianak/Indonesia | 00.003 | 109.367 | LF4060 | Ver2.0(10-08-26 -) |
| RKB | Rikubetsu/Japan | 43.45 | 143.77 | LF4060 | Ver1.0(06-03-08 - 10-04-24) |
| Ver1.1(10-04-28 - 15-03-15) |
| Ver2.0(15-03-15 -) |
| SGR | Sasaguri/Japan | 33.632 | 130.505 | LFL1010 | Ver2.0(14-11-27 -) |
| SRB | Saraburi/Thailand | 14.528 | 100.910 | LF4060 (12-06-12 -) | Ver2.0(12-06-12 -) |
| DXonePro (14-03-09 -) |
| TKN | Takine/Japan | 37.342 | 140.676 | LFL1010 | Ver2.0(14-12-13 - 2015-03) |
| TWN | Tainann/ROC | 23.07 | 120.12 | LF4060 (07-12-28 -) | Ver1.0(07-12-28 - 10-04-22) |
| DXonePro (13-03-04 -) | Ver1.1(10-04-27 - 14-11-15) |
| Ver2.0(14-12-28 -) |
| ZAO | Zao/Japan | 38.10 | 140.53 | DXonePro | Ver1.0(07-10-10 - 10-02-21) |
| Ver2.0(10-02-21 -) |
Acknowledgments
This project is carried out by the joint research program of the Institute for Space-Earth Environmental Research, Nagoya University.
This project is supported by the Inter–university Upper atmosphere Global Observation NETwork (IUGONET) project funded by the Ministry of Education, Culture, Sports, Science and Technology of Japan.
This project was supported by JSPS Grants-in-Aid for Scientific Research (20740281).
| Code | Site name | Acknowledgments |
| ATH | Athabasca/Canada | Dr. Martin Connors, Athabasca University |
| KAG | Kagoshima/Japan | Dr. Shiokawa, Nagoya University |
| NYA | Ny-Alseund/Norway | National Institute of Polar Research, Japan |
| | | The Norwegian Polar Institute |
| PKR | Polar Flat/AK USA | Dr. Donald Hampton, University of Alaska, Fairbanks |
| PTK | Pontianak/Indonesia | Dr. Timbul Manik, LAPAN |
| RKB | Rikubetsu/Japan | Drs. Shiokawa and Miyoshi, Nagoya University |
| | | Mr. Yokozeki, Rikubetsu observatory |
| SGR | Sasaguri/Japan | Drs. Yoshikawa, Abe, and Uozumi, Kyushu University |
| SRB | Saraburi/Thailand | Prof. Thanawat Jarupongsakul and Mr. Vijak Pangsapa, Chulalongkorn University |
| | | Dr. Boossarasiri Thana , Promotion of Teaching Science and Technology (IPST) |
| TKN | Takine/Japan | Mr. Ohno, Hoshi-no-mura astronomical observatory |
| TWN | Tainann/ROC | Dr. Alfred Chen, NCKU |
| ZAO | Zao/Japan | Zao observatory, Tohoku University |
Collaboration
Link
Publication
Hirai, A., F. Tsuchiya, T. Obara, Y. Kasaba, Y. Katoh, H. Misawa, K. Shiokawa, Y. Miyoshi, S. Kurita, S. Matsuda, M. Connors, T. Nagatsuma, K. Sakaguchi, Y. Kasahara, A. Kumamoto, A. Matsuoka, M. Shoji, I. Shinohara and J. M. Albert (2018), Temporal and Spatial Correspondence of Pc1/EMIC Waves and Relativistic Electron Precipitations Observed with Ground-Based Multi-Instruments on 27 March 2017, Geophysical Research Letters,
https://doi.org/10.1029/2018GL080126
Tsuchiya, F., A. Hirai, T. Obara, H. Misawa, S. Kurita, Y. Miyoshi, K. Shiokawa, M. Connors, M. Ozaki, Y. Kasahara, A. Kumamoto, Y. Kasaba, A. Matsuoka, M. Shoji, I. Shinohara (2018), Energetic electron precipitation associated with pulsating aurora observed by VLF radio propagation during recovery phase of substorm on 27 March 2017, Geophysical Research Letters,
https://doi.org/10.1029/2018GL080222
Ohya H., F. Tsuchiya, Y. Takishita, H. Shinagawa, K. Nozaki, K. Shiokawa(2018), Periodic Oscillations in the D Region Ionosphere After the 2011 Tohoku Earthquake Using LF Standard Radio Waves, Journal of Geophysical Research-Space physics 123(6) 5261-5270,
https://doi.org/10.1029/2018JA025289
Shiokawa K, et al. (2017), Ground-based instruments of the PWING project to investigate dynamics of the inner magnetosphere at subauroral latitudes as a part of the ERG-ground coordinated observation network, Earth, Planets and Space201769:160,
https://doi.org/10.1186/s40623-017-0745-9
Miyoshi, Y., S. Oyama, S. Saito, S. Kurita, H. Fujiwara, R. Kataoka, Y. Ebihara, C. Kletzing,G. Reeves, O. Santolik, M. Clilverd, C. J. Rodger, E. Turunen, and F. Tsuchiya (2015), Energetic electron precipitation associated with pulsating aurora: EISCAT and Van Allen Probe observations, Journal of Geophysical Research,120 2754-2766,
https://doi.org/10.1002/2014JA020690
Shiokawa, K., Y. Yokoyama, A. Ieda, Y. Miyoshi, R. Nomura, S. Lee, N. Sunagawa, Y. Miyashita, M. Ozaki, K. Ishizaka, S. Yagitani, R. Kataoka, F. Tsuchiya, I. Schofield and M. Connors, Ground-based ELF/VLF chorus observations at subauroral latitudes—VLF-CHAIN Campaign, Journal of Geophysical Research 9 7363-7379,
https://doi.org/10.1002/2014JA020161
Ohya, H., F. Tsuchiya, H. Nakata, K. Shiokawa, Y. Miyoshi, K. Yamashita, and Y. Takahashi (2012), Reflection height of daytime tweek atmospherics during the solar eclipse of 22 July 2009, J. Geophys Res. 117 A11310,
https://doi.org/10.1029/2012JA018151
Tadokoro, H., F. Tsuchiya, Y. Miyoshi, Y. Katoh, A. Morioka, and H. Misawa (2009), Storm-time electron flux precipitation in the inner radiation belt cause by wave-particle interactions, Ann. Geophys 27 1669-1677, Ann. Geophys., 27, 1669-1677,
https://doi.org/10.5194/angeo-27-1669-2009
Tadokoro, H., F. Tsuchiya, Y. Miyoshi, H. Misawa, A. Morioka, and D. S. Evans (2007), Electron flux enhancement in the inner radiation belt during moderate magnetic storms, Annales geophysicae 25(6) 1359-1364,
https://doi.org/10.5194/angeo-25-1359-2007
