Alexander, Caroline, Walsh, Robert William, Regnier, Stephane, Cirtain, Jonathan, Winebarger, Amy R., Golub, Leon, Kobayashi, Ken, Platt, Simon Philip, Mitchell, Nicholas Philip, Korreck, Kelly, DePontieu, Bart, DeForest, Craig, Weber, Mark, Title, Alan and Kuzin, Sergey (2013) Anti-parallel EUV flows observed along active region filament threads with HI-C. The Astrophysical Journal, 775 (1). L32. ISSN 2041-8205
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Official URL: http://dx.doi.org/10.1088/2041-8205/775/1/L32
Plasma flows within prominences/filaments have been observed for many years and hold valuable clues concerning the mass and energy balance within these structures. Previous observations of these flows primarily come from Hα and cool extreme-ultraviolet (EUV) lines (e.g., 304 Å) where estimates of the size of the prominence threads has been limited by the resolution of the available instrumentation. Evidence of "counter-steaming" flows has previously been inferred from these cool plasma observations, but now, for the first time, these flows have been directly imaged along fundamental filament threads within the million degree corona (at 193 Å). In this work, we present observations of an AR filament observed with the High-resolution Coronal Imager (Hi-C) that exhibits anti-parallel flows along adjacent filament threads. Complementary data from the Solar Dynamics Observatory (SDO)/Atmospheric Imaging Assembly (AIA) and Helioseismic and Magnetic Imager are presented. The ultra-high spatial and temporal resolution of Hi-C allow the anti-parallel flow velocities to be measured (70-80 km s-1) and gives an indication of the resolvable thickness of the individual strands (0.″8 ± 0.″1). The temperature of the plasma flows was estimated to be log T (K) = 5.45 ± 0.10 using Emission Measure loci analysis. We find that SDO/AIA cannot clearly observe these anti-parallel flows or measure their velocity or thread width due to its larger pixel size. We suggest that anti-parallel/counter-streaming flows are likely commonplace within all filaments and are currently not observed in EUV due to current instrument spatial resolution. © 2013. The American Astronomical Society. All rights reserved.
|Uncontrolled Keywords (separate with ;):||Sun: corona; Sun: filaments, prominences|
|Subjects:||Physical sciences > Astronomy|
|Schools:||Faculty of Science and Technology > School of Engineering|
Faculty of Science and Technology > School of Physical Sciences and Computing
Specialist Services > Office of the University Director of Research
|Deposited By:||Paul Harrison|
|Deposited On:||06 Aug 2014 13:38|
|Last Modified:||09 Aug 2016 15:21|
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