Direct Observations of Different Sunspot Waves Influenced by Umbral Flashes
| Autor: | Girjesh R. Gupta, Aishawnnya Sharma, Amit Pathak, Vinay L. Kashyap, Durgesh Tripathi |
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| Rok vydání: | 2017 |
| Předmět: |
Physics
Photosphere Sunspot 010504 meteorology & atmospheric sciences Solar dynamics observatory FOS: Physical sciences Astronomy and Astrophysics Astrophysics Light curve 01 natural sciences On board Amplitude Atmosphere of Earth Astrophysics - Solar and Stellar Astrophysics Fourier filtering Space and Planetary Science Physics::Space Physics 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) 0105 earth and related environmental sciences |
| Zdroj: | The Astrophysical Journal. 850:206 |
| ISSN: | 1538-4357 |
| Popis: | We report the simultaneous presence of chromospheric umbral flashes and associated umbral waves, and propagating coronal disturbances, in a sunspot and related active region. We have analyzed time-distance maps obtained using the observations from Atmospheric Imaging Assembly (AIA) on-board Solar Dynamics Observatory (SDO). These maps show the simultaneous occurrence of different sunspot oscillation and waves such as umbral flashes, umbral waves, and coronal waves. Analysis of the original light curves, i.e., without implementing any Fourier filtering on them, show that the amplitudes of different sunspot waves observed at different atmospheric layers change in synchronization with the light curves obtained from the umbral flash region, thus demonstrating that these oscillations are modulated by umbral flashes. This study provides the first observational evidence of the influence of sunspot oscillations within the umbra on other sunspot waves extending up to the corona. The properties of these waves and oscillations can be utilized to study the inherent magnetic coupling among different layers of the solar atmosphere above sunspots. 10 pages, 11 figures. Published in the ApJ |
| Databáze: | OpenAIRE |
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