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Magnetic nulls and super-radial expansion in the solar corona View all abstracts by submitter

Sarah Gibson   Submitted: 2017-04-29 11:01

Magnetic fields in the sun's outer atmosphere - the corona - control both solar-wind acceleration and the dynamics of solar eruptions. We present the first clear observational evidence of coronal magnetic nulls in off-limb linearly polarized observations of pseudostreamers, taken by the Coronal Multichannel Polarimeter (CoMP) telescope. These nulls represent regions where magnetic reconnection is likely to act as a catalyst for solar activity. CoMP linear-polarization observations also provide an independent, coronal proxy for magnetic expansion into the solar wind, a quantity often used to parameterize and predict the solar wind speed at Earth. We introduce a new method for explicitly calculating expansion factors from CoMP coronal linear-polarization observations, which does not require photospheric extrapolations. We conclude that linearly-polarized light is a powerful new diagnostic of critical coronal magnetic topologies and the expanding magnetic flux tubes that channel the solar wind.

Authors: Sarah E. Gibson, Kevin Dalmasse, Laurel A. Rachmeler, Marc L. De Rosa, Steven Tomczyk, Giuliana de Toma, Joan Burkepile, Michael Galloy
Projects: None

Publication Status: accepted
Last Modified: 2017-05-01 14:34
Go to main E-Print page  Two Step Filament Eruption During 14-15 March 2015   Evidence for two-loop interaction from IRIS and SDO observations of penumbral brightenings  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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