Welcome to the IPRT DATA CENTER

Data Specifications Data Open Policy Collaborations Publication Contact Link

What is IPRT and AMATERAS ?

IPRT (Iitate Planetary Radio Telescope), is a ground-based radio telescope developed by Tohoku University. IPRT has been operated at the Iitate observatory in Fukushima prefecture Japan since 2000 (Iitate village, Fukushima prefecture, Japan; 37d 42m N, 140d 41m E). IPRT measures meter to decimeter natural radio waves at fixed frequencies of 325 and 785 MHz using LNA and also from 150 to 500MHz using wide-band receiver. Primary purposes of the telescope are to investigate the dynamic behavior of Jupiter’s synchrotron radiation and solar radio emissions in the low-frequency range. For this purpose, IPRT is mainly dedicated for observations of solar system bodies. In addition to this, IPRT has capability to observe weak radio sources in the low frequency range (e.g. pulars).

AMATERAS (the Assembly of Metric-band Aperture TElescope and Real-time Analysis System) is wideband metric radio spectro-polarimeter and performs well enough to observe solar radio bursts in the frequency range between 150 and 500 MHz. The minimum detectable flux in this frequency range is less than 0.7 SFU with 10 ms accumulation time and 61 kHz bandwidth. Simultaneous observations for both RCP and LCP are possible.


Observation data from AMATERAS (time and frequency resolutions are redacted to 1 sec and 1 MHz) and quick look plot are available from links below.

Specification of IPRT and AMATERS

Mechanichal specification of IPRT
Apature size31m(D)x16.5m(L)x2set (1023m^2)

Antenna type Dual asymmetric offset parabola
Focal length 12m (F/D=0.39)
Reflector surface Stainless mesh (20mm pitch, 9mm RMS)
Feed system Half wave dipole
Mount type Altitude-Azimuth
Steerable range EL:22-100deg, AZ:-270-270deg

Electrical specification of IPRT
Beam width(FWHM)325MHz:1.5×2.1deg, 785MHz:0.6×0.7deg

Tsys 325MHz:150K, 785MHz:100K
Aperture effi. 325MHz:60-65%, 785MHz:40%
Polarization 325MHz:Stokes, 785MHz:Linear
Min detectable flux 0.1Jy (df:10MHz, dt:10sec)
Bandwidth 10MHz each
Data aquisition Power meter and waveform(8Msps)

Specification of AMATERAS
(see Iwai et al. [2012] in detail)
Frequency range150-500MHz

Digital spectrometer Aquiris AC240 (fs:2GHz, 8bit)
Feed system Crossed half wave dipole
Polarization LH and RH
Time & spectral resolutions 10msec & 61kHz
Min detectable flux 0.7 SFU


Data open policy

We would like to present the following two guidelines.
The 1st one concerns what we would like you to do when you use the data.

  1. Contacts: Please tell us what you are working on. This is partly because to protect potential Ph.D. thesis projects. Also, if your project coincides with one that team members are working on, that can lead to a fruitful collaboration. This will also work for you to obtain better insights relating to the data.
    The 2nd one concerns what you do when you make any presentations and publications using the data.
  2. Co-authorship: When the data forms an important part of your work, we would like you to offer us co-authorship.
  3. Acknowledgements: All presentations and publications should carry the following sentence: “IPRT (Iitate Planetary Radio Telescope) is a Japanese radio telescope developed and operated by Tohoku University.”
  4. Entry to publication list: When your publication is accepted please let us know by sending email to PIs.


Collaboration and observation request

We provide opportunities of observation and collaboration with IPRT and AMATERAS for various observation targets on request basis.
The proposal must be feasible for performances of IPRT and AMATRAS and does not conflict regular observation schedule of Jupiter and solar radio observations.
Please contact to us if you are interested in.

Examples of radio sources and phenomena observed and tried by IPRT

  • Pulsars (Univ. Tokyo and RIKEN)
  • Thermal emission from subsrface of the Moon
  • Radio emission from the lunar surface by meteoroid impact process(Moscow University)
  • Interplanetary Scintillation
  • Deep space communication experiment(Aichi Univ. of Tech.)>



  • Kita, H., H. Misawa, A. Bhardwaj, F. Tsuchiya, G. Murakami, C. Tao, T. Kimura, K. Yoshioka, A. Yamazaki, Y. Kasaba, I. Yoshikawa, M. Fujimoto (2019), Short-term variation in the dawn-dusk asymmetry of the Jovian radiation belt obtained from GMRT and Hisaki EXCEED observations, Astrophysical Journal Letters, Volume 872, Number 2
    [view article]
  • Tsuchiya, F., H. Misawa, H. Kita, A. Morioka, T. Kondo (2019), Two-element radio interferometer for the observation of Jupiter’s synchrotron radiation, Proceedings of the International Symposium on Planetary Science 2011, p 47-58,
    [view article]


  • Han, S., G. Murakami, H. Kita, F. Tsuchiya, C. Tao, H. Misawa, A. Yamazaki, M. Nakamura (2018), Investigating solar-wind-driven electric field influence on long-term dynamics of Jovian synchrotron radiation, Journal of Geophysical Research: Space Physics,
    [view article]
  • Kaneda, K.; Misawa, H.; Iwai, K.; Masuda, S.; Tsuchiya, F.; Katoh, Y.; Obara, T. (2018), Detection of Propagating Fast Sausage Waves through Detailed Analysis of a Zebra-pattern Fine Structure in a Solar Radio Burst, The Astrophysical Journal Letters, Volume 855, Issue 2, article id. L29, 7 pp.
    [view article]


  • Tsuchiya, F., H. Misawa, T. Obara, K. Iwai, K. Kaneda, S. Matsumoto, A. Kumamoto, Y. Katoh, M. Yagi, and B. Cecconi (2017), Database of Solar Radio Bursts Observed by Solar Radio Spectro-Polarimeter AMATERAS, in Planetary Radio Emissions VIII, edited by G. Fischer, G. Mann, M. Panchenko, and P. Zarka, Austrian Academy of Sciences Press, Vienna, 445-453.
  • Hitomi Collaboration et al. (2017), Hitomi X-ray studies of Giant Radio Pulses from the Crab pulsar, in press.
    [view article]
  • Kaneda, K., H. Misawa, K. Iwai, F. Tsuchiya, T. Obara, Y. Katoh, and S. Masuda (2017), Polarization Characteristics of Zebra Patterns in Type IV Solar Radio Bursts, Astrophys. J., 842, 45, doi:10.3847/1538-4357/aa74c1.
    [view article]


  • Mikami, R., K. Asano, S. Tanaka, S. Kisaka, M. Sekido, K. Takefuji, H. Takeuchi, H. Misawa, F. Tsuchiya, H. Kita, Y. Yonekura, and T. Terasawa (2016), Wide-Band Spectra of Giant Radio Pulses from the Crab Pulsar, Astrophys J, 832:212(25pp),doi:10.3847/0004-637X/832/2/212.
    [view article]
  • Takefuji, K., T. Terasawa, T. Kondo, R. Mikami, H. Takeuchi, K. Asano, S. Tanaka, H. Misawa, F. Tsuchiya, H. Kita and M. Sekido (2016),
    VLBI of Giant Radio Pulse of Crab Pulsar Toward Fast Radio Burst Detection,
    Publications of the Astronomical Society of the Pacific, 128:084502 (6pp),doi:10.1088/1538-3873/128/966/084502.
    [view article]


  • Kaneda, K., H. Misawa, K. Iwai, F. Tsuchiya, and T. Obara (2015),
    Frequency Dependence of Polarization of Zebra Pattern in Type-IV Solar Radio Bursts,
    Astrophys. J., 808, L45, doi:10.1088/2041-8205/808/2/L45
    [view article]
  • Kita, H., H. Misawa, A. Bhardwaj, F. Tsuchiya, T. Sakanoi, Y. Kasaba, C. Tao, Y. Miyoshi, and A. Morioka (2015),
    Relation between the short-term variation of the Jovian radiation belt and thermosphere derived from radio and infrared observations,
    Journal of Geophysical Research, 120, 6614-6623, doi:10.1002/2015JA021374.
    [view article]


  • Iwai, K., Y. Miyoshi, S. Masuda, F. Tsuchiya, A. Morioka, and H. Misawa (2014),
    Spectral Structures and Their Generation Mechanisms for Solar Radio Type-I Bursts,
    Astrophys. J., 789, 4, doi:10.1088/0004-637X/789/1/4.
    [view article]
  • Katoh, Y., K. Iwai, Y. Nishimura, A. Kumamoto, H. Misawa, F. Tsuchiya, and T. Ono (2014),
    Generation Mechanism of the Slowly Drifting Narrowband Structure in the Type IV Solar Radio Bursts Observed by Amateras,
    Astrophys. J., 787, 45, doi:10.1088/0004-637X/787/1/45.
    [view article]
  • Kita, H., H. Misawa, F. Tsuchiya, C. Tao, and A. Morioka (2014),
    Effect of solar UV/EUV heating on the intensity and spatial distribution of Jupiter’s synchrotron radiation,
    Journal of Geophysical Research, 118, 1-10, doi:10.1002/jgra.50568.
    [view article]


  • Nishimura, Y., T. Ono, F. Tsuchiya, H. Misawa, A. Kumamoto, Y. Katoh, S. Masuda, and Y. Miyoshi (2013),
    Narrowband frequency-drift structures in solar type IV bursts,
    Earth Planets Space, 65, 12, 1555-1562, doi:10.5047/eps.2013.09.009
    [view article]
  • Iwai, K., S. Masuda, Y. Miyoshi, F. Tsuchiya, A. Morioka, and H. Misawa (2013),
    Peak flux distribution of solar radio Type-I bursts from highly resolved spectral observations,
    Astrophys. J., 768:L2, doi::10.1088/2041-8205/768/1/L2.
    [view article]


  • Iwai, K., F. Tsuchiya, A. Morioka, H. Misawa (2012)
    IPRT/AMATERAS: A New Metric Spectrum Observation System for Solar Radio Bursts,
    Solar Phys., 277, 2, 447-457, 10.1007/s11207-011-9919-y
    [view article]
  • Iwai, K., Y. Miyoshi, S. Masuda, M. Shimojo, D. Shiota, S. Inoue, F. Tsuchiya, A. Morioka, and H. Misawa (2012),
    Solar Radio Type-I Noise Storm Modulated by Coronal Mass Ejections,
    Astrophys. J., 744 167 doi:10.1088/0004-637X/744/2/167
    [view article]
  • Iwai, K., H. Misawa, F. Tsuchiya, A. Morioka, S. Masuda, and Y. Miyoshi (2012)
    Survey of Accelerated Particles in a Solar Active Region Using Hinode/XRT and Ground-Based Type-I Radio Burst Observations, Hinode-3, ASP Conference Series, Vol. 454, 249-253.
    [view article]


  • Tsuchiya, F., H. Misawa, K. Imai, and A. Morioka (2011),
    Short-term changes in Jupiter’s synchrotron radiation at 325 MHz: Enhanced radial diffusion in Jupiter’s radiation belt driven by solar UV/EUV heating, J. Geophys. Res., 116, A09202, doi:10.1029/2010JA016303.
    [view article]
  • Tsuchiya, F., H. Misawa, K. Imai, A. Morioka, and T. Kondo (2010),
    Multi-frequency total flux measurements of Jupiter’s synchrotron radiation in 2007,
    Adv. Geosci., 19, 601-612.
    [view article]
  • Misawa, H., R. Kudo, F. Tsuchiya, A. Morioka, and T. Kondo (2003),
    Development of a primary feed system for the parabolic rectangular reflector antenna dedicated for planetary radio emission, paper presented at 3rd Communications Research Laboratory Technology Development Center Symposium,
    Commun. Res. Lab., Kashima, Japan.
    [view article]


Hiroaki Misawa (PI of the IPRT project)
Fuminori Tsuchiya (Co-I of the IPRT project)
Kazumasa Iwai (Executive scientist of AMATERAS)
_at_: should be changed to “@”