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April 5, 2014
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Japanese (translated by Yuichi Iga)
Hello again, Here is another report, this one about interesting recent changes in the Great Red Spot. The summary is below. One PDF file contains the text plus mini-copies of the figures. The full-size figures should be posted on our web site next month but if you would like to see them now, ask and I will send (2 MB file).
best wishes, John Rogers
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Jupiter in 2013/14: Interim report no.7 The Great Red Spot in 2013/14: Faster shrinkage and evidence for faster wind speed
John Rogers (British Astronomical Association), 2014 March 30Summary: In 2013/14, the Great Red Spot (GRS) is smaller than ever before, with a length of 13.6 deg. (15860 km). It also has an exceptionally short circulation period: 3.6 (±0.2) days. The inferred wind speed, 144 (±14) m/s, is faster than any previous measurement of the mean peak wind except for one (by Galileo in 2000), but the difference is less than the uncertainties. If the wind speed has truly accelerated, in 2013/14 as in 2000, this may be due to influx of vorticity from the STBn jet spots which are being disrupted along the edge of the GRS.
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_______________________________ John H. Rogers, Ph.D. Jupiter Section Director, British Astronomical Association jhr11@cam.ac.uk http://www.britastro.org/jupiter/ _________________________________
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Report on changes in Jupiter's GRS
2014年4月5日
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2013/14年の木星： 中間レポート no.7 2013/14年の大赤斑：迅速な縮小と高速な風速の証拠 Jupiter in 2013/14: Interim report no.7 The Great Red Spot in 2013/14: Faster shrinkage and evidence for faster wind speed
John Rogers (British Astronomical Association), 2014 March 30サマリー 2013/14年に、大赤斑(GRS)は長さ13.6度(15860km)と以前よりは小さい。また、例外的に3.6(±0.2)日の短い循環周期を持つ。推測風速144(±14)m/sは一つ(2000年のガリレオ探査機)を除いていかなる平均ピーク風速の過去の測定より速いが、違いはほとんどない。もし風速が、2000年のように2013/14年に、実際に加速しているならば、それは大赤斑の端に沿って消滅しているSTBnジェット気流暗斑からの渦の流入によるかもしれない。
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_______________________________ John H. Rogers, Ph.D. Jupiter Section Director, British Astronomical Association jhr11@cam.ac.uk http://www.britastro.org/jupiter/ _________________________________
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【日本語訳：伊賀祐一 (Yuichi Iga)】 |