p Modes in and Away from a Sunspot
A time series of GONG Dopplergrams for the period 10-14 May 1997 from Udaipur and Big Bear sites has been used to measure the velocity fluctuations in a sunspot (NOAA active region 8038) and quiet photosphere simultaneously. We observe that the power of pre-dominant p mode is reduced in the sunspot...
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| Veröffentlicht in: | Solar physics 2000-02, Vol.191 (2), p.293-307 |
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| container_end_page | 307 |
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| container_title | Solar physics |
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| creator | Kumar, Brajesh Jain, Rajmal Tripathy, S C Vats, Hari Om Deshpande, M R |
| description | A time series of GONG Dopplergrams for the period 10-14 May 1997 from Udaipur and Big Bear sites has been used to measure the velocity fluctuations in a sunspot (NOAA active region 8038) and quiet photosphere simultaneously. We observe that the power of pre-dominant p mode is reduced in the sunspot as compared to quiet photosphere by 39-52% depending on the location of the sunspot region on the solar disk. We also observe a relative peak frequency deviation of p modes in the sunspot, of the order of 80-310 μHz, which shows a linear dependence on the magnetic field gradient in the active region. The maximum frequency deviation of 310 μHz on 12 May appears to be an influence of a long-duration solar flare that occurred in this active region. We interpret this relative peak frequency deviation as either due to power re-distribution of p modes in the sunspot or a consequence of frequency modulation of these modes along the magnetic flux tubes due to rapidly varying magnetic field structure.[PUBLICATION ABSTRACT] |
| doi_str_mv | 10.1023/A:1005209623215 |
| format | Article |
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| subjects | Magnetic fields Magnetism Solar physics |
| title | p Modes in and Away from a Sunspot |
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