Welcome to the IPRT DATA CENTER

Data Specifications Data Open Policy Collaboration 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
Antenna type Dual asymmetric offset parabola
Apature size 31m(D)x16.5m(L)x2set (1023m^2)
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
Tsys 325MHz:150K, 785MHz:100K
Beam width(FWHM) 325MHz:1.5x2.1deg, 785MHz:0.6x0.7deg
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)
Digital spectrometer Aquiris AC240 (fs:2GHz, 8bit)
Frequency range 150-500MHz
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



Hiroaki Misawa (PI of the IPRT project)
Fuminori Tsuchiya (Co-I of the IPRT project)
Kazumasa Iwai (Executive scientist of AMATERAS)
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Copyright © 2011
PPARC/Tohoku University