Abstract


  DIRECT OBSERVATIONAL EVIDENCE OF DIFFERENT SUNSPOT WAVES AND OSCILLATIONS DRIVEN BY A COMMON SOURCE

  A. Sharma, Tezpur University, sharmaaishawnnya@gmail.com
  G. Gupta, IUCAA, girjesh@gmail.com
  D. Tripathi, IUCAA, durgesh@iucaa.in
  A. Pathak, Tezpur UNiversity, amitpah@gmail.com

Observations of different sunspot waves in photosphere, chromosphere, and corona are reported. We found simultaneous presence of photospheric p-mode, chromospheric umbral flash and associated umbral waves, and propagating slow magneto-acoustic coronal waves in a sunspot and associated active region. Properties of these waves and oscillations can be utilised to study the inherent magnetic coupling among different layers of solar atmosphere above the sunspot. We report one observation which can provide evidence of such connection between different atmospheric layers. In this study we have used original light curves without any filtration to obtain the results. We find a consistent growth in oscillation amplitudes with time for the different sunspot waves and oscillations observed at different atmospheric layers. Our analysis and results suggest that these oscillations are driven by common source most likely photospheric p-modes, which propagates upward into the chromosphere, and corona.