OCTAVES : VLF/LF ionosphere observation network
Welcome
Contact
Station list
Acknowledgments
Collaboration
Data
Document
Link
Award
Publication
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
Contact
- 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.X(2010-10-24 -) |
KAG | Kagoshima/Japan | 43.45 | 143.77 |
LFL1010 (2016-12-20 – 2019-10-27) DXonePro (2019-10-27 -) |
Ver2.X(2016-12-20 -) |
KEVO | KEVO/Finland | 69.70 | 27.14 | loop antenna | Ver2.6(2022-09-16 -) |
MAM | Maimaga/Russia | 63.06 | 129.56 |
DXonePro |
Ver2.X(2017-01-29 -) |
NYA | Ny-Alseund/Norway | 78.933 | 11.867 | LF4060 | Ver2.X(2010-03-07 -) |
PIN | Pinawa/Canada | 50.259 | 264.135 | Loop antenna | Ver2.X(2019-08-27-) |
PKR | Pokar Flat/AK USA | 65.125 | 212.512 | DXonePro | Ver2.X(2014-10-17 -) |
PTK | Pontianak/Indonesia | 00.003 | 109.367 | LF4060 | Ver2.X(2010-08-26 -) |
RKB | Rikubetsu/Japan | 43.45 | 143.77 | LF4060 | Ver1.0(2006-03-08 – 2010-04-24) |
Ver1.1(2010-04-28 – 2015-03-15) | |||||
Ver2.X(2015-03-15 -) | |||||
SGR | Sasaguri/Japan | 33.632 | 130.505 | LFL1010 | Ver2.X(2014-11-27 -2017-12-26) |
SRB | Saraburi/Thailand | 14.528 | 100.910 | LF4060 (2012-06-12 -) | Ver2.X(2012-06-12 -) |
DXonePro (2014-03-09 -) | |||||
TKN | Takine/Japan | 37.342 | 140.676 | LFL1010 | Ver2.X(2014-12-13 – 2015-03) |
TWN | Tainann/ROC | 23.07 | 120.12 | LF4060 (2007-12-28 -) | Ver1.0(2007-12-28 – 2010-04-22) |
DXonePro (2013-03-04 -) | Ver1.1(2010-04-27 – 2014-11-15) | ||||
Ver2.X(2014-12-28 -) | |||||
ZAO | Zao/Japan | 38.10 | 140.53 | DXonePro | Ver1.0(2007-10-10 – 2010-02-21) |
Ver2.X(2010-02-21 -2014-8-17) |
- Electric monopole : LF4060, DXonePro
- Orthogonal magnetic loop : LFL1010
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 |
MAM | Maimaga/Russia | Dr. Dmitry Baishev, IKFIA SB RAS |
NYA | Ny-Alseund/Norway | National Institute of Polar Research, Japan |
The Norwegian Polar Institute | ||
PIN | Pinawa/Canada | Operated by Canadian Space Agency |
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
- Asian VLF observation network (AVON) led by Drs. Takahashi (Hokkaido U), Ohya (Chiba U), and Yamashita (Ashikaga U)
- PWING (study of dynamical variation of Particles and Waves in the INner magnetosphere using Ground-based network observations)
- ERG Science center
- Inter-university Upper Atmosphere Global Observation Network (IUGONET)
Data
Archive
- Raw data
Data format
- Raw data format
Document
- Tutorial used for AVON winter school
Link
Award
Name | Award | Title of paper |
---|---|---|
Asuka Hirai |
150th SGEPSS Fall meeting (Nov 2021) |
The mechanism of frequency increase of IPDP type EMIC waves: event analysis of ground and satellite observations |
Hiroki Nomoto (UEC) |
150th SGEPSS Fall meeting (Nov 2021) |
Modeling of Perturbation in the Lower Ionosphere caused by EMIC waves using Numerical Simulation of subionospheric VLF signals |
Asuka Hirai (Tohoku U) |
Japan Geoscience Union 2021 (May 2021) Japan Geoscience Union Meeting 2021 – Student Presentation Award |
Properties of EMIC waves observed by Van Allen Probes and ground-based magnetometers during relativistic electron precipitation |
Tekkan Akashi (Chiba U) |
Society of Atmospheric Electricity of Japan 99th Conference (Jan, 2021) |
VLF/LF帯標準電波を用いた2015年ネパール地震後のD領域電離圏変動の解析 |
Takuya Miyashita (Chiba U) |
URSI-JRSM 2019 (Sept, 2019) Student Paper Competition, Third Prize |
ULF Modulation of Energetic Electron Precipitations Observed by VLF/LF Standard Radio Waves |
Asuka Hirai |
15th AOGS Annual meeting (Jun 2018) AOGS Best Student Poster Award (ST19-A010) |
Temporal and Spatial Correspondence of Pc1/EMIC Waves and Energetic Electron Precipitation with Ground-Based Observation on 27 March, 2017 |
Related publication
- Yuma Nozaki, Hiroyo Ohya, Fuminori Tsuchiya, Kenro Nozaki, Hiroyuki Nakata, and Kazuo Shiokawa (2022). Local Time and Seasonal Variations in the D-Region Ionosphere: Does It
Reflect Sudden Stratospheric Warming Effects?. Special Section on URSI-JRSM2022, Radio Science Letters (volume 4). DOI:10.46620/22-0045 - Kentaro Tanaka, Hiroyo Ohya, Fuminori Tsuchiya, Kenro Nozaki, Mariko Teramoto, Kazuo Shiokawa, Yoshizumi Miyoshi, Martin Connors, and Hiroyuki Nakata (2022). Ultra Low Frequency Modulation of Energetic Electron Precipitation in the D-Region Ionosphere in a Magnetically Quiet Time Using OCTAVE Very Low Frequency and Low Frequency (VLF/LF) Observations. Special Section on URSI-JRSM2022, Radio Science Letters (volume 4). DOI:10.46620/22-0049
- Masaharu Nakayama, Hiroyo Ohya, Fuminori Tsuchiya, Kenro Nozaki, Kazuo Shiokawa, and Hiroyuki Nakata (2022). Horizontal Inhomogeneity in the D-Region Ionosphere During an X-Class
Solar Flare Determined by OCTAVE VLF Observations. Special Section on URSI-JRSM2022, Radio Science Letters (volume 4). DOI:10.46620/22-0050 - Akashi, T., H. Ohya, F. Tsuchiya, K. Nozaki, H. Nakata (2021). Variation in the D-region ionosphere after the 2015 Nepal earthquake using LF transmitter signals. Journal of Atmospheric Electricity, 40 (1), 1-9. https://doi.org/10.1541/jae.40.1
- Kawamura, M., T. Sakanoi, M. Fukizawa, Y. Miyoshi, K. Hosokawa, F. Tsuchiya, Y. Katoh, Y. Ogawa, K. Asamura, S. Saito, H. Spence, A. Johnson, S. Oyama, U. Brändström (2021). Simultaneous Pulsating Aurora and Microburst Observations With Ground‐Based Fast Auroral Imagers and CubeSat FIREBIRD‐II. Geophysical Research Letters, 48(18). https://doi.org/10.1029/2021gl094494
- Miyoshi, Y., S. Saito S. Kurita K. Asamura K. Hosokawa T. Sakanoi T. Mitani Y. Ogawa S. Oyama F. Tsuchiya S. L. Jones A. N. Jaynes J. B. Blake (2020). Relativistic electron microbursts as high energy tail of pulsating aurora electrons. Geophysical Research Letters, 47, e2020GL090360. https://doi.org/10.1029/2020GL090360
- Miyashita, T., H. Ohya, F. Tsuchiya, A. Hirai, M. Ozaki, K. Shiokawa, Y. Miyoshi, N. Nishitani, M. Teramoto, M. Connors, S. G. Shepherd, Y. Kasahara, A. Kumamoto, M. Shoji, I. Shinohara, H. Nakata, T. Takano (2020), ULF Modulation of Energetic Electron Precipitations Observed by VLF/LF Radio Propagation, Radio Science Bulletin, Vol. 372, http://www.ursi.org/content/RSB/RSB_372_2020_03.pdf
- 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