Yohkoh SXT Full-Resolution Observations of Sigmoids: Structure, Formation, and Eruption
نویسندگان
چکیده
منابع مشابه
Yohkoh Sxt Full-resolution Observations of Sigmoids: Structure, Formation, and Eruption
We study the structure of 107 bright sigmoids using full-resolution (2.5 pixels) images from the Yohkoh Soft X-Ray Telescope (SXT) obtained between 1991 December and 2001 December. We find that none of these sigmoids are made of single loops of S or inverse-S shape; all comprise a pattern of multiple loops. We also find that all S-shaped sigmoids are made of right-bearing loops and all inverse-...
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We deduce electron temperatures in a 2–3 month old active region from 1996 September and October, using soft Xray S xv spectra from the Bragg Crystal Spectrometer (BCS) and images from the Soft X-ray Telescope (SXT), both on board the Yohkoh satellite. Our observations cover a full transit of the region, from before its appearance around the east limb until after it disappeared around the west ...
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A sudden depletion or intensity “dimming” of the X-ray corona sometimes accompanies a solar eruptive flare or coronal mass ejection (CME). We have identified a dimming that occurred just prior to a “halo” CME, observed on 1997 April 7 using the Soft X-ray Telescope (SXT) on Yohkoh. Halo CMEs are prime candidates for “space weather” effects. The dimming occurred in compact regions near a flare o...
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We use Hinode observations to study coronal structures about to flare, based on their apparent footpoints as a guide to identification. The high resolution and excellent stability of the Hinode observations makes the identifications much more precise than those done with the soft X-ray telescope (SXT) on board Yohkoh. The physical conditions in the coronal structure about to flare are important...
متن کاملAnalysis and comparison of loop structures imaged with NIXT and Yohkoh/SXT
We analyze and compare five coronal regions simultaneously observed by NIXT and Yohkoh/SXT on April 12, 1993. The compact loop structures (length ∼ 109 cm) imaged in three regions with NIXT and with SXT have a good general morphological correspondence. A large scale (≈ 1.7×1010 cm) and an intermediate scale (≈ 5× 109 cm) structure observed in the NIXT image have no obvious counterpart in the SX...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2007
ISSN: 0004-637X,1538-4357
DOI: 10.1086/524729