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ALMA and IRIS Observations of the Solar Chromosphere II: Structure and Dynamics of Chromospheric Plage View all abstracts by submitter

Georgios Chintzoglou   Submitted: 2020-12-13 19:27

We propose and employ a novel empirical method for determining chromospheric plage regions, which seems to better isolate plage from its surrounding regions compared to other methods commonly used. We caution that isolating plage from its immediate surroundings must be done with care in order to successfully mitigate statistical biases that, for instance, can impact quantitative comparisons between different chromospheric observables. Using this methodology, our analysis suggests that 1.25 mm wavelength free-free emission in plage regions observed with ALMA/Band6 may not form in the low chromosphere as previously thought, but rather in the upper chromospheric parts of dynamic plage features (such as spicules and other bright structures), i.e., near geometric heights of transition region temperatures. We investigate the high degree of similarity between chromospheric plage features observed in ALMA/Band6 (at 1.25 mm wavelength) and IRIS/Si IV at 1393Ĺ. We also show that IRIS/Mg II h and k is not as well correlated with ALMA/Band6 as was previously thought, and we discuss the discrepancies with previous works. Lastly, we report indications for chromospheric heating due to propagating shocks supported by the ALMA/Band6 observations.

Authors: Georgios Chintzoglou, Bart De Pontieu, Juan Martínez-Sykora, Viggo Hansteen, Jaime de la Cruz Rodríguez, Mikolaj Szydlarski, Shahin Jafarzadeh, Sven Wedemeyer, Timothy S. Bastian and Alberto Sainz Dalda

Publication Status: ApJ (in press)
Last Modified: 2020-12-15 21:09
Go to main E-Print page  Signatures of Cross-sectional Width Modulation in Solar Spicules due to Field-aligned Flows  ALMA and IRIS Observations of the Solar Chromosphere I: an On-Disk Type II Spicule  Edit Entry  Download Preprint  Delete Entry 

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