Matches in SemOpenAlex for { <https://semopenalex.org/work/W4315644245> ?p ?o ?g. }
- W4315644245 endingPage "62" @default.
- W4315644245 startingPage "62" @default.
- W4315644245 abstract "Sunspot light bridges (LBs) exhibit a wide range of short-lived phenomena in the chromosphere and transition region. In contrast, we use here data from the Multi-Application Solar Telescope (MAST), the Interface Region Imaging Spectrograph (IRIS), Hinode, the Atmospheric Imaging Assembly (AIA), and the Helioseismic and Magnetic Imager (HMI) to analyze the sustained heating over days in an LB in a regular sunspot. Chromospheric temperatures were retrieved from the the MAST Ca II and IRIS Mg II lines by nonlocal thermodynamic equilibrium inversions. Line widths, Doppler shifts, and intensities were derived from the IRIS lines using Gaussian fits. Coronal temperatures were estimated through the differential emission measure, while the coronal magnetic field was obtained from an extrapolation of the HMI vector field. At the photosphere, the LB exhibits a granular morphology with field strengths of about 400 G and no significant electric currents. The sunspot does not fragment, and the LB remains stable for several days. The chromospheric temperature, IRIS line intensities and widths, and AIA 171 AA and 211 AA intensities are all enhanced in the LB with temperatures from 8000 K to 2.5 MK. Photospheric plasma motions remain small, while the chromosphere and transition region indicate predominantly red-shifts of 5-20 km/s with occasional supersonic downflows exceeding 100 km/s. The excess thermal energy over the LB is about 3.2x10^26 erg and matches the radiative losses. It could be supplied by magnetic flux loss of the sunspot (7.5x10^27 erg), kinetic energy from the increase in the LB width (4x10^28 erg), or freefall of mass along the coronal loops (6.3x10^26 ,erg)." @default.
- W4315644245 created "2023-01-12" @default.
- W4315644245 creator A5006983355 @default.
- W4315644245 creator A5029067411 @default.
- W4315644245 creator A5038769658 @default.
- W4315644245 creator A5042090975 @default.
- W4315644245 creator A5077904036 @default.
- W4315644245 date "2023-01-01" @default.
- W4315644245 modified "2023-09-30" @default.
- W4315644245 title "Sustained Heating of the Chromosphere and Transition Region Over a Sunspot Light Bridge" @default.
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