Multi-Station System for Solar Wind Observations Using the Interplanetary Scintillation Method.

Asai, Kikuo; Ishida, Yasuhiro; Kojma, Masayoshi; Maruyama, Kazuo; Misawa, Hiroaki; Yoshimi, Naohiko

doi:10.5636/jgg.47.1107

Cited by 36 publications

(23 citation statements)

References 2 publications

(2 reference statements)

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“…Multi-station IPS measurements of the solar wind have been conducted regularly over more than three decades at the Solar-Terrestrial Environment Laboratory (STEL) of Nagoya University using the UHF radio-telescope array, which is composed of large antennas at Toyokawa, Fuji, Sugadaira, and Kiso 6,17) (see Table 1). The locations of the antenna sites, which are shown in Fig.…”

Section: Ips Observations With 327-mhz Multi-station Systemmentioning

confidence: 99%

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Three-dimensional exploration of the solar wind using observations of interplanetary scintillation

Tokumaru

2013

Proc. Jpn. Acad., Ser. B

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The solar wind, a supersonic plasma flow continuously emanating from the Sun, governs the space environment in a vast region extending to the boundary of the heliosphere (∼100 AU). Precise understanding of the solar wind is of importance not only because it will satisfy scientific interest in an enigmatic astrophysical phenomenon, but because it has broad impacts on relevant fields. Interplanetary scintillation (IPS) of compact radio sources at meter to centimeter wavelengths serves as a useful ground-based method for investigating the solar wind. IPS measurements of the solar wind at a frequency of 327 MHz have been carried out regularly since the 1980s using the multi-station system of the Solar-Terrestrial Environment Laboratory (STEL) of Nagoya University. This paper reviews new aspects of the solar wind revealed from our IPS observations.

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Section: Ips Observations With 327-mhz Multi-station Systemmentioning

confidence: 99%

“…5,6) This project aims to elucidate the enigmas of the solar wind from observations of its 3-dimensional properties, which are inaccessible with in situ measurements. Various important aspects of the solar wind have been unveiled from STEL IPS observations.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional exploration of the solar wind using observations of interplanetary scintillation

Tokumaru

2013

Proc. Jpn. Acad., Ser. B

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“…IPS observations were carried out daily between April and December every year using the 327 MHz four‐station system of the Solar‐Terrestrial Environment Laboratory (STEL) of Nagoya University [ Kojima and Kakinuma , 1990; Asai et al , 1995]. Nearly 40 radio sources within a solar elongation of 90 deg were used for our daily IPS observations.…”

Section: Solar‐terrestrial Environment Laboratory Ips Observationsmentioning

confidence: 99%

Interplanetary consequences caused by the extremely intense solar activity during October–November 2003

et al. 2005

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[1] We report interplanetary scintillation (IPS) measurements made by the 327 MHz four-station system of the Solar-Terrestrial Environment Laboratory of Nagoya University, during 21 October to 8 November 2003. In this period, solar activity increased greatly owing to the appearance of huge eruptive sunspots on the solar disk. Interplanetary (IP) disturbance events traveling from the Sun beyond the Earth's orbit have been detected clearly from our IPS observations in association with most of the major eruptive events that occurred on the Sun during that period. A possible link between solar/IPS events and near-Earth (IP shock) events in that same period was investigated in this study. As a result, an IP counterpart was identified by our IPS observations for all of the shock events which occurred during the period, and the link to solar events was established unambiguously for the majority of shock events on the basis of the identification of their IP counterparts. Among the IP disturbance events, the most prominent one occurred between 28 and 29 October 2003, and it is considered as an IP counterpart to the 28 October X17 flare event. Our IPS data revealed a complex feature of this IP disturbance and demonstrated that the global distribution of the solar wind density turbulence settled into a rather quiescent condition after the X17 event except between 2 and 4 November 2003, despite the occurrence of marked solar activities. This is in clear contrast to the fact that enhancements of the turbulence level had taken place frequently before the event. The lack of marked g-value enhancements for those events is considered partly due to the intrinsic effect related to a change in the global distribution of the solar wind turbulence and partly due to artificial effects inherent in our IPS observations. The radial expansion of the IP disturbance was tracked successfully by consecutive IPS observations during the period between 2 and 4 November in association with the 2 November X8.3 flare event. The movement of this IP disturbance inferred from IPS data was found to be generally consistent with the average transit speed of the IP shock associated with the X8.3 event, although some deceleration of the IP disturbance may have taken place.

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“…These IPS facilities use higher frequencies, enabling observations closer to the Sun. Our IPS observations have been carried out regularly since the early 1980s using the 327-MHz multi-station system (Kojima and Kakinuma, 1990;Asai et al, 1995). Figure 1 shows the geographic location of the STEL IPS system and one of the IPS antennas (the 327-MHz radio-telescope at Fuji Observatory).…”

Section: Interplanetary Scintillation Measurements Of the Solar Windmentioning

confidence: 99%

Tracking heliospheric disturbances by interplanetary scintillation

Tokumaru

Kojima

Fujiki

et al. 2006

Nonlin. Processes Geophys.

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Abstract. Coronal mass ejections are known as a solar cause of significant geospace disturbances, and a fuller elucidation of their physical properties and propagation dynamics is needed for space weather predictions. The scintillation of cosmic radio sources caused by turbulence in the solar wind (interplanetary scintillation; IPS) serves as an effective ground-based method for monitoring disturbances in the heliosphere. We studied global properties of transient solar wind streams driven by CMEs using 327-MHz IPS observations of the Solar-Terrestrial Environment Laboratory (STEL) of Nagoya University. In this study, we reconstructed three-dimensional features of the interplanetary (IP) counterpart of the CME from the IPS data by applying the model fitting technique. As a result, loop-shaped density enhancements were deduced for some CME events, whereas shellshaped high-density regions were observed for the other events. In addition, CME speeds were found to evolve significantly during the propagation between the corona and 1 AU.

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Multi-Station System for Solar Wind Observations Using the Interplanetary Scintillation Method.

Cited by 36 publications

References 2 publications

Three-dimensional exploration of the solar wind using observations of interplanetary scintillation

Three-dimensional exploration of the solar wind using observations of interplanetary scintillation

Interplanetary consequences caused by the extremely intense solar activity during October–November 2003

Tracking heliospheric disturbances by interplanetary scintillation

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