Presentation Open Access

A new seismic diagnostics of stellar activity cycles

Valeriy Vasilyev


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{
  "publisher": "Zenodo", 
  "DOI": "10.5281/zenodo.5578911", 
  "author": [
    {
      "family": "Valeriy Vasilyev"
    }
  ], 
  "issued": {
    "date-parts": [
      [
        2021, 
        10, 
        18
      ]
    ]
  }, 
  "abstract": "<p>&nbsp;Magnetic activity affects the observed properties of solar p modes:<br>\nmode frequencies and linewidths increase with solar activity. Using VIRGO/SPM<br>\ndata from solar cycles 23 and 24 we show that solar-cycle variations are<br>\nmeasurable in the temporal autocorrelation function of the p modes. Following<br>\na method developed for local helioseismology, we measure the p-mode travel<br>\ntimes for multiple skips and propose to average these to enhance the<br>\nsignal-to-noise ratio. This method is robust to noise, simpler to implement<br>\nthan peak bagging in the frequency domain, and promising for asteroseismology<br>\napplications. We estimate that the activity cycles of Sun-like stars may be<br>\ndetectable in long photometric time series.</p>", 
  "title": "A new seismic diagnostics of  stellar activity cycles", 
  "type": "speech", 
  "id": "5578911"
}
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