Presentation Open Access

A new seismic diagnostics of stellar activity cycles

Valeriy Vasilyev

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    <subfield code="a">&lt;p&gt;&amp;nbsp;Magnetic activity affects the observed properties of solar p modes:&lt;br&gt;
mode frequencies and linewidths increase with solar activity. Using VIRGO/SPM&lt;br&gt;
data from solar cycles 23 and 24 we show that solar-cycle variations are&lt;br&gt;
measurable in the temporal autocorrelation function of the p modes. Following&lt;br&gt;
a method developed for local helioseismology, we measure the p-mode travel&lt;br&gt;
times for multiple skips and propose to average these to enhance the&lt;br&gt;
signal-to-noise ratio. This method is robust to noise, simpler to implement&lt;br&gt;
than peak bagging in the frequency domain, and promising for asteroseismology&lt;br&gt;
applications. We estimate that the activity cycles of Sun-like stars may be&lt;br&gt;
detectable in long photometric time series.&lt;/p&gt;</subfield>
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