HF Doppler observation associated with magnetic storm

Ichinose, Takumi; Ogawa, Teiichiro

doi:10.1016/0021-9169(74)90192-5

Cited by 5 publications

(1 citation statement)

References 5 publications

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“…Since the basics of HFD sounding were invented by Ogawa (1958), the initial HFD observation in Japan was carried out by researchers at Doshisha University. Ichinose and Ogawa (1974) examined the vertical motion of the ionosphere using HFD observations and showed that the derivative of the horizontal component of the geomagnetic eld varied in phase with the Doppler frequency during a sudden commencement (SC). Concerning the internal gravity waves caused by a solar eclipse, Ichinose and Ogawa (1976) showed that uctuations with a period of 22 min appeared on the day of a solar eclipse.…”

Section: Introductionmentioning

confidence: 99%

Software-Defined-Radio Based HF Doppler Receiving System

Nakata

Nozaki

Oki

et al. 2021

Preprint

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High-frequency Doppler (HFD) sounding is a major remote sensing technique for monitoring the ionosphere. Conventional systems for HFDs mainly utilize analog circuits. However, existing analog systems have become difficult to maintain as the number of individuals adept at working with analog circuits has declined. To solve this problem, we developed an alternate HFD receiver system based on digital signal processing. The software-defined radio (SDR) technique enables the receiver to be set up without the knowledge of analog circuit devices. This approach also downsizes the system and reduces costs. A highly stabilized radio system for both the transmitter and receiver is necessary for stable long-term observations of various phenomena in the ionosphere. The global positioning system disciplined oscillator with an accuracy of H compensates for the frequency stability required by the new receiving system. In the new system, four frequencies are received and signal-processed simultaneously. The dynamic range of the new system is wider (> 130 dB) than that of the conventional system. The signal-to-noise ratio significantly improved by 20 dB. The new digital system enables radio waves to be received with much smaller amplitudes at four different frequencies. New digital receivers have been installed at some of the stations in the HFD observation network in Japan and have already captured various ionospheric phenomena, including medium-scale traveling ionospheric disturbances and sudden commencement induced electric field fluctuations, which indicates the feasibility of SDR for actual ionospheric observations. The new digital receiver is simple, inexpensive, and small in size, which makes it easy to deploy new receiving stations in Japan and elsewhere. These advantages of the new system will help drive the construction of a wide HFD observation network.

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Section: Introductionmentioning

confidence: 99%

Software-Defined-Radio Based HF Doppler Receiving System

Nakata

Nozaki

Oki

et al. 2021

Preprint

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Horizontal transmission of the polar electric field to the equator

Kikuchi¹,

Araki

1979

Journal of Atmospheric and Terrestrial Physics

201

202

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Geomagnetic storms and substorms

Siscoe¹

1975

Reviews of Geophysics

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This report is divided into two main parts corresponding roughly to observations and interpretations. The observation section is subdivided into papers concerned with the solar wind, geomagnetic tail, the magnetosphere, and the ionosphere and atmosphere. These regions are of course interdependent, and the boundaries between them are not sharp. However, most papers are clearly assignable to one of the three groups. The few that are not are assigned to the most appropriate one or are multiply referenced. Papers on subjects included in other reports in this series are mentioned here if they bear directly on storms and substorms. Papers on ionospheric storms and the storm response of the neutral atmosphere are included in the references. PHENOMENOLOGY Solar Wind

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HF Doppler observation associated with magnetic storm

Cited by 5 publications

References 5 publications

Software-Defined-Radio Based HF Doppler Receiving System

Software-Defined-Radio Based HF Doppler Receiving System

Horizontal transmission of the polar electric field to the equator

Geomagnetic storms and substorms

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