南北両半球の中低緯度における多点イメージングリオメータ観測 : 2006年12月の地磁気嵐中の宇宙電波吸収現象

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An imaging riometer (IRIS) was newly installed at Kakioka (36.2° N, 140.2E), Japan in July 2006. Three IRISs had been already installed in South America (Santa Maria, Concepcion and Punta Arenas). Thus four IRISs are now operating at low and mid latitude region. The cosmic-noise-absorption (CNA) phenomena during the strong geomagnetic storm on December 14-16, 2006 were observed simultaneously by all the four IRISs in the northern and southern hemispheres. Arcshaped CNA with 0.3-0.5dB intensity were observed in the initial and the recovery phases of the storm and band-shaped CNA was also observed during the main phase of the storm at Kakioka. At Santa Maria (29.4°S) in the Brazilian geomagnetic anomaly region, band-shape CNA elongated east-westerly was observed in the recovery phase. At Concepcion (37.5°S) in Chile, CNA expanded fully over the IRIS field of view was observed in the main phase. At Punta Arenas (53.1°S) in Chile, arc-shape CNA was observed in the main phase. From these IRIS data, it is found that the CNA features are similar shape in the initial phase between Kakioka and Santa Maria, while they are different in the main to the recovery phases of the storm. It is also found from three IRISs in South America that spatial-scale of CNA is less than 1500km and their absorption features show proper aspects to their latitudes. It is suggested that the arc-shaped CNA observed at Kakioka seems to be the middle scale traveling ionospheric disturbances (MSTID) by comparison with ionosonde data at Kokubunji and also total electron content data (TEC) measured by GPS satellites
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南北両半球の中低緯度における多点イメージングリオメータ観測 : 2006年12月の地磁気嵐中の宇宙電波吸収現象

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