Conference paper Open Access

# Dynamo Sensitivity in Solar Analogs with 50 Years of Ca II H & K Activity

Egeland, Ricky; Willie Soon; Sallie Baliunas; Jeffrey C. Hall; Alexei A. Pevtsov; Gregory W. Henry

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{
"publisher": "Zenodo",
"DOI": "10.5281/zenodo.154118",
"title": "Dynamo Sensitivity in Solar Analogs with 50 Years of Ca II H & K Activity",
"issued": {
"date-parts": [
[
2016,
9,
15
]
]
},
"abstract": "<p>The Sun has a steady 11-year cycle in magnetic activity most well-known by the rising and falling in the occurrence of dark sunspots on the solar disk in visible bandpasses. \u00a0The 11-year cycle is also manifest in the variations of emission in the Ca II H &amp; K line cores, due to non-thermal (i.e. magnetic) heating in the lower chromosphere. \u00a0The large variation in Ca II H &amp; K emission allows for study of the patterns of long-term variability in other stars thanks to synoptic monitoring with the Mount Wilson Observatory HK photometers (1966-2003) and Lowell Observatory Solar-Stellar Spectrograph (1994-present). \u00a0Overlapping measurements for a set of 27 nearby solar-analog (spectral types G0-G5) stars were used to calibrate the two instruments and construct time series of magnetic activity up to 50 years in length. \u00a0Precise properties of fundamental importance to the dynamo are available from Hipparcos, the Geneva-Copenhagen Survey, and CHARA interferometry. \u00a0Using these long time series and measurements of fundamental properties, we do a comparative study of stellar \"twins\" to explore the sensitivity of the stellar dynamo to small changes to structure, rotation, and composition. \u00a0We also compare this sample to the Sun and find hints that the regular periodic variability of the solar cycle may be rare among its nearest neighbors in parameter space.</p>",
"author": [
{
"family": "Egeland, Ricky"
},
{
"family": "Willie Soon"
},
{
"family": "Sallie Baliunas"
},
{
"family": "Jeffrey C. Hall"
},
{
"family": "Alexei A. Pevtsov"
},
{
"family": "Gregory W. Henry"
}
],
"id": "154118",
"note": "Based on presentation given at the Cool Stars 19 Monday Morning Plenary Session, 11:00-11:20",
"event-place": "Up",
"type": "paper-conference",
"event": "The 19th (CS19)"
}
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