| Project/Area Number |
17540425
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Space and upper atmospheric physics
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| Research Institution | Kochi National College of Technology |
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Principal Investigator |
IMAI Kazumasa Kochi National College of Technology, Department of Electrical Engineering, Professor (20132657)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAJYO Tomoyuki Fukui University of Technology, Department of Space Communication Engineering, Lecturer (00367509)
TOMIZAWA Ichiro University of Electro-Communications, Department of Electronic Engineering, Associate Professor (50111696)
KONDO Tetsuro National Institute of Information and Communications Technology, Kashima Space Research Center, Chief Scientist (10359052)
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| Project Period (FY) |
2005 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2006: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 2005: ¥1,900,000 (Direct Cost: ¥1,900,000)
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| Keywords | Jupiter / Natural Radio Emissions / Decametric Wave / VLBI / Next Generation Internet / Radio Source / Fine Structure / Modulation Lanes |
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| Research Abstract |
Frequency-time dynamic spectra of Jupiter's decametric radio emission display a complex structure on several different time scales. One of the characteristic spectral patterns on a time scale of a few tens of seconds is the modulation lanes discovered by Riihimaa in 1968. We developed a model for the mechanism responsible for their production in which the free parameters can be adjusted to provide a very close fit with the observations. [Imai, et. al., 1992a, 1992b, 1997, 2002]. This modulation lane method can be very powerful tool for the remote sensing of the spatial information of the Jupiter's radio sources. We proposed the new Jupiter radio VLSI with the simultaneous modulation lane observations to study the fine structure of Jupiter's radio sources. Our VLBI system over the Internet for the Jupiter radio makes VLBI observation possible in real time by using JGN2, which is a next-generation experimental network on the Internet. The VLBI system consists of the servers including the VLBI sampler board, and 10MHz Rb Oscillators locked by GPS system. The signal of Jupiter radio is filtered by the frequency range from 26 to 28MHz and digitized by using high order sampling technique without frequency conversion. We have developed and tested this new VLBI system for the investigation of the fine structures of Jupiter's decametric radio sources.
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