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The solar-stellar connection from core to corona: current progress and future prospects with the DKIST

Event Details

Event Dates: 

Monday, March 20, 2017 - 4:00pm

Seminar Location: 

  • JILA Auditorium

Speaker Name(s): 

Alicia Aarnio

Speaker Affiliation(s): 

University of Colorado, Boulder
Seminar Type/Subject

Scientific Seminar Type: 

  • Astrophysical & Planetary Sciences Colloquia

Event Details & Abstract: 

It has long been recognized our Sun is one in a vast ensemble of Sun-like stars. In the past century, Hale and Joy impressed upon the community the need to apply quantitative measures to place our Sun into context with main-sequence stars and to also study young Suns to learn the history of our own. In this talk, I will discuss solar and stellar flares and eruptive activity, magnetic field structure and connectivity, and broader space- and exoweather implications. Motivated by the fundamental problem of angular momentum evolution in star formation, we invoke the solar-stellar connection to make the first estimates of coronal mass ejection rates and properties on solar-like stars. Observing correlated flare-CME events with the DKIST will have applications to both the Sun and stars, providing new data sets to mine for predictive space weather indicators while clarifying fundamental physical links and what stellar observations could imply for future Carrington-like events (or worse!) on the Sun. With the simultaneous spectropolarimetric capabilities of the DKIST instrument suite, it will be possible to address fundamental problems in solar physics and star formation that are rooted in understanding the behavior of stellar magnetic fields from photosphere to corona. For intermediate mass stars, which we find to have surprisingly solar-like interiors, we aim to model their dynamos and emergent flux to determine the as-yet unmeasured large-scale field geometries by which they accrete. Solar-stellar research is mutually beneficial, and the relocation of the NSO and its engagement with the Boulder space research community allows immediate focus on key elements of the DKIST critical science plan as they apply to both the Sun and stars.


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