Time evolution of the chromospheric heating and evaporation process Case study of an M1.1 flare on 2014 September 6 Peter Young 1,2, Hui Tian 3, Katharine.

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Presentation transcript:

Time evolution of the chromospheric heating and evaporation process Case study of an M1.1 flare on 2014 September 6 Peter Young 1,2, Hui Tian 3, Katharine Reeves 3, Bin Chen 3, Wei Liu 4,5 & Sean McKillop 3 1 George Mason University 2 NASA Goddard Space Flight Center 3 Harvard-Smithsonian Center for Astrophysics 4 Lockheed Martin Solar and Astrophysics Laboratory 5 Stanford University [Tian et al. 2015, arXiv: ]

IRIS sit-and-stare flare observations IRIS observes Fe XXI λ1354.1, formed at 11 MK Ideal for studying evaporation of hot plasma during flares 0.3” spatial resolution individual flare kernels resolved Sit-and-stare gives best time resolution (~ few seconds) Examples 1.6-Sep-2014, 16:56 UT, M Sep-2014, 17:33 UT, X1.6 Peter Young (GMU/GSFC) RHESSI Workshop, August Note: IRIS flare list at X. Cheng et al. (2015, ApJ, 804, 82) T. Li & J. Zhang (2015, ApJ, 804, L8) Graham & Cauzzi (2015, ApJ, 807, L22) D. Li et al. (2015, ApJ, 807, 72)

What do we expect to see? Chromospheric heating (e.g., particle beams) leads to evaporation of hot (>10 MK) plasma, which fills up coronal loops with hot, dense plasma. Peter Young (GMU/GSFC) RHESSI Workshop, August slit loop 2 loop 3 loop 1 (ribbon)

Spectra from ribbons and loops Peter Young (GMU/GSFC) RHESSI Workshop, August Blending from multiple chromospheric lines (narrow) Enhanced continuum Fe XXI blue-shifted and weak Limited blending (only C I) Fe XXI at rest and strong

Critical questions How does the timing of 11 MK plasma relate to… –…timing of HXR bursts –…timing of chromospheric heating Data sources: HXR – RHESSI & GOES derivative Chromosphere – IRIS: NUV & FUV continua; Mg II λ Peter Young (GMU/GSFC) RHESSI Workshop, August

Movie snapshot Peter Young (GMU/GSFC) RHESSI Workshop, August Mg II λ FUV continuum enhanced at ribbon IRIS slit cuts through loop footpoint Snapshot is from impulsive phase

Movie Peter Young (GMU/GSFC) RHESSI Workshop, August

Time evolution of Fe XXI Time evolution of two “clean” flare kernel locations Fe XXI starts at ≈-200 km/s and moves to rest in ≈ 3 mins Peter Young (GMU/GSFC) RHESSI Workshop, August

Is Fe XXI present when chromosphere heated? The Fe XXI line is difficult to identify when the FUV continuum brightens Peter Young (GMU/GSFC) RHESSI Workshop, August Spectrum from peak of FUV continuum – is Fe XXI present? Young et al. (2015) and Graham & Cauzzi (2015) suggest second delay for X-flares

Fe XXI correlation with X-rays Peter Young (GMU/GSFC) RHESSI Workshop, August Fe XXI blueshift RHESSI keV

Fe XXI correlation with chromosphere Peter Young (GMU/GSFC) RHESSI Workshop, August Fe XXI blueshift

Correlation plots Look for correlations between magnitude of Fe XXI blueshift and other parameters Peter Young (GMU/GSFC) RHESSI Workshop, August

Chromospheric lines A common feature of IRIS flares is extended red wing of chromospheric lines Peter Young (GMU/GSFC) RHESSI Workshop, August Red-shifted component to cool lines More extreme example: 29-Mar-2014 X-flare Mg II λ2792 Si II λ Also see Brannon et al. (2015, arXiv: )

Summary Clear chromospheric evaporation signature –Large blueshift (200 km/s) at ribbon –Decreases to zero after ≈3 mins Fe XXI may appear at same time as HXR burst and continuum enhancement –noisy chromospheric “background” prevents measurement –definitely appears within ≈20-30 seconds for this flare Challenge for modelers –can predict timing of Fe XXI appearance? –spatial extent of blue-shifted Fe XXI along loop? Chromospheric lines (Si IV and cooler) show extended red wings at ribbon sites –two-component structure often seen Peter Young (GMU/GSFC) RHESSI Workshop, August