Chromospheric and Transition Region dynamics
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1 Chromospheric and Transition Region dynamics Luc Rouppe van der Voort University of Oslo
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7 IRIS: type II spicules are heated to at least TR temperatures Pereira et al ApJL 792
8 type II spicules are heated to at least TR temperatures IRIS Mg II 2796 Å SDO/AIA He II 304 Å Hinode Ca II H IRIS Si IV 1400 Å Quiet Sun at South Pole sample of 54 spicules: 41 (76%) fade in Ca H 30 (56%) brighten in Si IV when Ca H fades Skogsrud et al ApJ in press (arxiv ), see poster Skogsrud et al.
9 Ca II H Mg II 2796 Å Si IV 1400 Å He II 304 Å sample of 54 spicules: 41 (76%) fade in Ca H 30 (56%) brighten in Si IV when Ca H fades 24 (44%) are brighter in Si IV at top Skogsrud et al ApJ in press (arxiv ), see poster Skogsrud et al.
10 SST/CRISP: Hα -54 km/s, μ= Mm On-disk we observe absorption features with same characteristics as off-limb type II spicules
11 Rapid Blue-shifted Excursions (RBE) time λ average profile λ Hα -60 km/s Rouppe van der Voort et al ApJ 705 RBEs are the disk-counterparts of type II spicules
12 RRE (Rapid Red-shifted Excursion) RBE (Rapid Blue-shifted Excursion) Ca II km/s Ca II 8542 Ca II 8542 ±16 km/s Hα Doppler Disk center Quiet Sun Sekse et al ApJ 769
13 RRE (Rapid Red-shifted Excursion) RBE (Rapid Blue-shifted Excursion) Ca II km/s Ca II kinds of motion: upflow swaying torsion Ca II 8542 ±16 km/s Hα Doppler Disk center Quiet Sun Sekse et al ApJ 769
14 Transition Region response to type II spicules on-disk: network jets (see Tian et al Science)
15 Transition Region response to type II spicules on-disk: network jets (see Tian et al Science) RRE RBE
16 IRIS network jets (see Tian et al. Science 2014) IRIS SJI 1330 IRIS SJI 1400 RRE RBE SST Halpha Doppler ±46 km/s SST Halpha -46 km/s De Pontieu et al Science, Rouppe van der Voort et al ApJL 799
17 IRIS SJI 1330 IRIS SJI 1400 RRE RBE SST Halpha Doppler ±46 km/s SST Halpha -46 km/s De Pontieu et al Science, Rouppe van der Voort et al ApJL 799
18 Connection network jets and RBE/RREs RRE RBE torsional motion and associated heating De Pontieu et al Science, Rouppe van der Voort et al ApJL 799
19 Connection network jets and RBE/RREs Rouppe van der Voort et al ApJL 799
20 RBE: Rapid Blue-shifted Excursion Rouppe van der Voort et al ApJL 799
21 RRE: Rapid Red-shifted Excursion Rouppe van der Voort et al ApJL
22 Ca II H Mg II 2796 Å Si IV 1400 Å He II 304 Å parabolic trajectory for type II in Ca H? (33%) Note: heating along the spicule length and higher velocities Skogsrud et al ApJ in press (arxiv ), see poster Skogsrud et al.
23 Type I Type II parabolic trajectory for type II in Ca H? Note: heating along the spicule length and higher velocities Skogsrud et al ApJ in press (arxiv ), see poster Skogsrud et al.
24 Active region plage: dynamic fibrils (type I spicules)
25 Active region plage: dynamic fibrils (type I spicules)
26 Active region plage: dynamic fibrils (type I spicules) SST 04-Oct-2005 Hansteen et al. 2006, De Pontieu et al. 2007
27 Active region plage: dynamic fibrils (type I spicules) SST 04-Oct-2005 Hansteen et al. 2006, De Pontieu et al. 2007
28 Active region plage: dynamic fibrils (type I spicules) Hansteen et al. 2006, De Pontieu et al. 2007
29 Active region plage: dynamic fibrils (type I spicules) Radiative MHD simulations show the formation of dynamic chromospheric features similar to DFs, driven by shocks caused by upward propagating waves in the chromosphere. Hansteen et al. 2006, De Pontieu et al. 2007
30 observations vs simulations: x-t plots observations simulations Spicule-like features in simulations show parabolic paths similar to those observed in Dynamic Fibrils. Hansteen et al. 2006, De Pontieu et al. 2007
31 Active region plage: dynamic fibrils (type I spicules)
32 Active region plage: dynamic fibrils (type I spicules)
33 Hα line center Si IV 1400
34 Active region plage: dynamic fibrils (type I spicules) Hα vs. Si IV 1400
35 Active region plage: dynamic fibrils (type I spicules) Hα line center Ca II 8542 line center Hα line center Ca II 8542 line center Si IV 1400 Å Mg II 2796 Å Si IV 1400 Å Mg II 2796 Å Hα -18 km/s Hα +18 km/s Hα -18 km/s Hα +18 km/s
36 Active region plage: dynamic fibrils (type I spicules) Ca II 8542 Å Hα 6563 Å Mg II k 2796 Å Si IV 1403 Å Transition Region response to dynamic fibrils: Si IV brightening, blueshift and line broadening
37 caution when comparing spectra extended structures
38 Active region plage: dynamic fibrils (type I spicules) large spatial raster Si IV SJI 1400 Si IV 1403 intensity Si IV 1403 Doppler ±20 km/s Si IV 1403 width 8-15 km/s Transition Region response to dynamic fibrils: Si IV brightening, blueshift and line broadening
39 Transition region response of internetwork acoustic grains? Martinez-Sykora et al ApJ 803
40 Transition region response of internetwork acoustic grains? mostly continuum emission from 55Å bandpass filters Martinez-Sykora et al ApJ 803
41 Conclusions Clear Transition Region response in spicules: type II: heating along the spicule length type I / dynamic fibrils: only at top Internetwork acoustic grains: (very) weak response in TR lines, IRIS SJI 1400 & 1330 emission mostly continuum
Heating diagnostics with MHD waves
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