Possible Evidence of Long-Term Oscillations in the Solar Atmosphere
2010104010023 物理系 We have obtained the temporal correlation function, Q(t), from time sequences of Cathinspii K filtergrams and Dopplergrams from Antarctica, Taiwan Oscillation Network (TON) and Solar and Heliospheric Observatory (SOHO). Q(t) gives the time evolution of the pattern under examination...
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ftnthuniv:oai:nthur.lib.nthu.edu.tw:987654321/54797 2023-05-15T13:31:11+02:00 Possible Evidence of Long-Term Oscillations in the Solar Atmosphere K.P. Raju;Jagdev Singh;R. Srikanth;Dean-Yi Chou;Ton Team 周定一 2001 http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/54797 En eng Springer Verlag Solar Physics, Springer Verlag, Volume 199, Issue 1, March 2001, Pages 1-11 long-term oscillations;solar atmosphere;temporal correlation function;time sequences;Ca II K filtergrams;Dopplergrams;Antarctic observations 33 Journal 2001 ftnthuniv 2014-12-17T20:56:05Z 2010104010023 物理系 We have obtained the temporal correlation function, Q(t), from time sequences of Cathinspii K filtergrams and Dopplergrams from Antarctica, Taiwan Oscillation Network (TON) and Solar and Heliospheric Observatory (SOHO). Q(t) gives the time evolution of the pattern under examination, supergranulation in this case. It has been found that Q(t) shows oscillatory signals of both 5-min and long-term periods. The 5-min oscillations are suppressed by averaging the images over 10 min. An exponential decay curve which represents the lifetime trend of supergranules, is fitted to Q(t) and subtracted out. The Q(t) residuals thus obtained contain the oscillatory component and are then subjected to a periodogram analysis. Significant periodicities in the range of 1.4–10 hours have been noted. The causes of these oscillations are not fully known at present, but the instrumental and atmospheric factors can be ruled out, pointing to solar origin. Various possibilities are discussed. Some of the observed periodicities may be considered as probable candidates for long-term oscillations in the Sun, such as the elusive gravity modes. Journal/Newspaper Antarc* Antarctic Antarctica National Tsing Hua University Institutional Repository (NTHUR) Antarctic |
institution |
Open Polar |
collection |
National Tsing Hua University Institutional Repository (NTHUR) |
op_collection_id |
ftnthuniv |
language |
English |
topic |
long-term oscillations;solar atmosphere;temporal correlation function;time sequences;Ca II K filtergrams;Dopplergrams;Antarctic observations 33 |
spellingShingle |
long-term oscillations;solar atmosphere;temporal correlation function;time sequences;Ca II K filtergrams;Dopplergrams;Antarctic observations 33 K.P. Raju;Jagdev Singh;R. Srikanth;Dean-Yi Chou;Ton Team Possible Evidence of Long-Term Oscillations in the Solar Atmosphere |
topic_facet |
long-term oscillations;solar atmosphere;temporal correlation function;time sequences;Ca II K filtergrams;Dopplergrams;Antarctic observations 33 |
description |
2010104010023 物理系 We have obtained the temporal correlation function, Q(t), from time sequences of Cathinspii K filtergrams and Dopplergrams from Antarctica, Taiwan Oscillation Network (TON) and Solar and Heliospheric Observatory (SOHO). Q(t) gives the time evolution of the pattern under examination, supergranulation in this case. It has been found that Q(t) shows oscillatory signals of both 5-min and long-term periods. The 5-min oscillations are suppressed by averaging the images over 10 min. An exponential decay curve which represents the lifetime trend of supergranules, is fitted to Q(t) and subtracted out. The Q(t) residuals thus obtained contain the oscillatory component and are then subjected to a periodogram analysis. Significant periodicities in the range of 1.4–10 hours have been noted. The causes of these oscillations are not fully known at present, but the instrumental and atmospheric factors can be ruled out, pointing to solar origin. Various possibilities are discussed. Some of the observed periodicities may be considered as probable candidates for long-term oscillations in the Sun, such as the elusive gravity modes. |
author2 |
周定一 |
format |
Journal/Newspaper |
author |
K.P. Raju;Jagdev Singh;R. Srikanth;Dean-Yi Chou;Ton Team |
author_facet |
K.P. Raju;Jagdev Singh;R. Srikanth;Dean-Yi Chou;Ton Team |
author_sort |
K.P. Raju;Jagdev Singh;R. Srikanth;Dean-Yi Chou;Ton Team |
title |
Possible Evidence of Long-Term Oscillations in the Solar Atmosphere |
title_short |
Possible Evidence of Long-Term Oscillations in the Solar Atmosphere |
title_full |
Possible Evidence of Long-Term Oscillations in the Solar Atmosphere |
title_fullStr |
Possible Evidence of Long-Term Oscillations in the Solar Atmosphere |
title_full_unstemmed |
Possible Evidence of Long-Term Oscillations in the Solar Atmosphere |
title_sort |
possible evidence of long-term oscillations in the solar atmosphere |
publisher |
Springer Verlag |
publishDate |
2001 |
url |
http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/54797 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_relation |
Solar Physics, Springer Verlag, Volume 199, Issue 1, March 2001, Pages 1-11 |
_version_ |
1766016529062690816 |