تقرير
Near-Sun Observations of an F-Corona Decrease and K-Corona Fine Structures
| العنوان: | Near-Sun Observations of an F-Corona Decrease and K-Corona Fine Structures |
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| المؤلفون: | R A Howard, A Vourlidas, V Bothmer, R C Colaninno, C E DeForest, B Gallagher, J R Hall, P Hess, A K Higginson, C M Korendyke, A Kouloumvakos, P L Lamy, P C Liewer, J Linker, M Linton, P Penteado, S P Plunkett, N Poirier, N E Raouafi, N Rich, P Rochus, A P Rouillard, D G Socker, G Stenborg, A F Thernisien, N M Viall |
| المصدر: | Nature. 576(7786) |
| بيانات النشر: | United States: NASA Center for Aerospace Information (CASI), 2019. |
| سنة النشر: | 2019 |
| مصطلحات موضوعية: | Solar Physics |
| الوصف: | Remote observations of the solar photospheric light scattered by electrons (K-corona) and dust (F-corona/Zodiacal light) have been made from the ground during eclipses and from space at 1 AU and as close as 0.3 AU. Previous observations of dust scattering have not confirmed the existence of a theoretically-predicted dust free zone near the Sun. The transient nature of the corona has been well characterized for large events, but questions still remain (e.g. initiation, production of solar energetic particles) and for small events even the structure is uncertain. Here we report on imaging the solar corona, from the Parker Solar Probe spacecraft, during the first two perihelion passes (0.16-0.25 AU), each of ten days duration. The view from these distances is qualitatively similar to the historical view, but there are some significant differences in the details. We have uncovered at short elongations a decrease in the intensity of the F-coronal intensity, which is suggestive of the long-sought dust free zone. Also we have resolved the plasma structure of very small eruptions, which are being frequently ejected from the Sun. They take two forms - the commonly observed magnetic flux ropes or the predicted, but not yet observed, magnetic islands arising from the tearing mode instability in the current sheet. Our observations of the coronal streamer evolution confirm the large-scale topology of the solar corona, but they also reveal that, as recently predicted, streamers are composed of yet smaller sub-streamers channeling continual density fluctuations at all visible scales. |
| نوع الوثيقة: | Report |
| اللغة: | English |
| تدمد: | 1476-4687 0028-0836 |
| DOI: | 10.1038/s41586-019-1807-x |
| URL الوصول: | https://ntrs.nasa.gov/citations/20230000889 |
| ملاحظات: | ERC DLV- 819189 DLR 50OL1901 |
| رقم الأكسشن: | edsnas.20230000889 |
| قاعدة البيانات: | NASA Technical Reports |
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Full Text Finder | تدمد: | 14764687 00280836 |
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| DOI: | 10.1038/s41586-019-1807-x |