Consideration of a New Radio Telescope for a Solar Wind Observation

We have been studying a 3-dimentional solar wind structure using interplanetary scintillation(IPS) observation with multi-stations. Our solar-wind-dedicated observationg system is an unique and useful instrument to monitor a long-term variation of the solar wind structure.

One of stations is located at Toyokawa campus, Nagoya University, and the antenna is adopted cylindrical parabola. This antenna is the oldest and has been up-grated to improve spatial and temporal resolutions for a few times, however, an old receiver system and an increasing radio noise level gave to degrading a data quality.

Thus we have a plan to make a Toyokawa antenna to improve the data quarity. We adopted phased-array to achieve a large aperture area to reduce the incident radio noiuse. It is possible to reduce the noise level about -10dB because dipole array can be placed near ground. Moreover the array srounded by metallic-mech fence, which shield the array from the radio noise(-15dB).

The New array has 64(EW)x256(NS) element antennas and its aperture is 4000m^2. This is twice larger than that the current Toyokawa antenna and is makes us possible to observe radio sources five times as large as the current one.