Analysis of ~21.5 d Period in Ionospheric and Solar Indices during 2011
By using Fourier transform, the spectrum of total electron content(TEC) data, relative sunspot number(RSSN), solar extreme ultraviolet(EUV) flux in 0.1~50 nm and 26~34 nm were performed to study the ~27 d period in solar-terrestrial environment. A~21.5 d period was found in TEC and solar indices, wh...
| Main Authors: | , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Surveying and Mapping Press
2017-01-01
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| Series: | Acta Geodaetica et Cartographica Sinica |
| Subjects: | |
| Online Access: | http://html.rhhz.net/CHXB/html/2017-1-9.htm |
| Summary: | By using Fourier transform, the spectrum of total electron content(TEC) data, relative sunspot number(RSSN), solar extreme ultraviolet(EUV) flux in 0.1~50 nm and 26~34 nm were performed to study the ~27 d period in solar-terrestrial environment. A~21.5 d period was found in TEC and solar indices, while geomagnetic indices showed no sign of this period. We infer that the ~21.5 d period could combined effects of solar rotation and active region evolution. Results of the past few solar cycles show that 21~23 d of quasi-periodic signal will appear in the rising phase of a solar cycle. Using the solar active regions located in the[-10°, 10°] slice, it is further confirmed that the ~21.5 d period observed in 2011 may be caused by the joint effects of solar active region complex and solar rotation. GIM data were used to study the global distribution of the ~27 d period oscillation. |
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| ISSN: | 1001-1595 1001-1595 |