Chromospheric and Transition Region Dynamics
as seen by IRIS

Bart De Pontieu and the IRIS team
Lockheed Martin Solar & Astrophysics Laboratory
Sunday, November 10, 13

IRIS events

27-June-2013: Pegasus launch
17-July-2013: First light
1-Oct-2013: Slit-jaw quicklook movies available
31-Oct-2013: IRIS data available

Sunday, November 10, 13

IRIS data products
SLITJAW IMAGES (SJI)

Mg II wing 2830Å

Mg II k 2796Å

6,000 K

15,000 K

FUV1: 1332-1358Å

Si IV 1400Å

30,000 K

65,000 K

FUV2: 1390-1406Å
Si IV 1394

SPECTRAC II 1335/1336

Mg II k 2796

Mg II h 2803
Sunday, November 10, 13

C II 1330Å

Si IV 1403

IRIS recent observations
http://iris.lmsal.com/iristoday

Sunday, November 10, 13

IRIS data search
http://iris.lmsal.com/search

Sunday, November 10, 13

IRIS documentation
http://iris.lmsal.com/documents.html

Sunday, November 10, 13

IRIS data and calibration
Level 1: uncalibrated, organized by CCD “image”
Level 1.5: dark current
flat-field
geometric correction
wavelength calibrationinternal co-alignment
Level 2: SJI: timeseries
Spectra: raster or timeseries (sit-and-stare)

Level1.5
12LevelSunday, November 10, 13

IRIS slitjaw and spectra reveal multitude of high velocity events

Data levels

courtesy Alan Title

IRIS spectra show a multitude of high velocity events associated with non-thermal
broading, both for a wide range of temperatures
Sunday, November 10, 13

IRIS slitjaw and spectra reveal multitude of high velocity events

courtesy Alan Title

IRIS spectra show a multitude of high velocity events associated with non-thermal
broading, both for a wide range of temperatures
Sunday, November 10, 13

IRIS slitjaw and spectra reveal multitude of high velocity events,
both at the limb and on disk
Mg II k 2796

Sunday, November 10, 13

Si IV 1403

SJI Si IV 1400

Quiet Sun and coronal hole dynamics also dominatedby shocks and high velocity events

Mg II k 2796

Si IV 1403

SJI Si IV 1400

(mix of bi-directional flows and torsional motions?)
Sunday, November 10, 13

Spicules dominated by three types of motions
field-aligned upflows, swaying motions and torsional motions

De Pontieu et al., 2012, see Skogsrud et al. poster, SST dataMovie Mats Carlsson

Inclined spectra in spicules indicate red/blueshift pattern across spicule
compatible with strong torsional motion of 20-30 km/s
Sunday, November 10, 13

Presence of strong “bidirectional flows” at the limb
supports strong torsional motions

Mg II k 2796

Sunday, November 10, 13

Si IV 1403

SJI Si IV 1400

Presence of strong “bidirectional flows” at the limb
supports strong torsional motions

Sunday, November 10, 13

2-Oct-2013
Si IV 1400

Sunday, November 10, 13

2-Oct-2013
Si IV 1400, O IV

Sunday, November 10, 13

Mg II k and h2-Oct-2013
Mg II h/k2796

Sunday, November 10, 13

Limb spectra suggest torsional motions ubiquitous
Mg II k 2796

Sunday, November 10, 13

Si IV 1403

SJI Si IV 1400

24-Sep-2013

Sunday, November 10, 13

Mg II k and h

Thermal evolution of spicules

Si IV 1400

C II 1330

24-Sep-2013

See Tiago Pereira’s talk this week
Sunday, November 10, 13

Thermal evolution of spicules

Si IV 1400

See Tiago Pereira’s talk this week
Sunday, November 10, 13

Mg II k 2796

Sunspot dynamics

courtesy Alan Title
Sunday, November 10, 13

Sunspot dynamicsMg II k 2796

Si IV 1403

SJI Si IV 1400

Strong umbral shocks shown propagating into TR lines
Strong downflows above sunspots (see also HRTS)
Sunday, November 10, 13

Sunspot dynamics

courtesy Alan Title

Strong umbral shocks shown propagating into TR lines
Sunday, November 10, 13

Prominence dynamics
Mg II k 2796

Sunday, November 10, 13

SJI Si IV 1400

Prominence dynamics
Mg II k 2796

Sunday, November 10, 13

SJI Mg II k 2796

Prominence dynamics

Mg II k 2796

Sunday, November 10, 13

Si IV 1403

SJI Si IV 1400

Prominence dynamics

Sunday, November 10, 13

Prominence dynamics, coordinated with Hinodecourtesy Joten Okamoto
Sunday, November 10, 13

Flux emergence
Mg II k 2796

Si IV 1403

Mg II k 2796

Si IV 1403

SJI Si IV 1400

SJI Si IV 1400

Flux emergence reveals very strange profiles suggesting multiple components
and very low-lying hot plasma (Ellerman bombs)
Sunday, November 10, 13

Provides diagnostics over whole range of heights: TR corrugation

courtesy Tiago Pereira
Sunday, November 10, 13

Provides diagnostics over whole range of heights: mid chromo Temperature

courtesy Tiago Pereira
Sunday, November 10, 13

Provides diagnostics over whole range of heights: upper chromo velocity
k3 Doppler shift

courtesy Tiago Pereira
Sunday, November 10, 13

Provides diagnostics over whole range of heights: mid chromo velocities
k2 Doppler shift

courtesy Tiago Pereira
Sunday, November 10, 13

Provides diagnostics over whole range of heights: turbulence

courtesy Tiago Pereira
Sunday, November 10, 13

Importance of temperature coverage

Si IV 1403 blue wing

Sunday, November 10, 13

Flux emergence

courtesy Hardi Peter
Overlying corona initially barely disturbed by emergence of TR loops
Sunday, November 10, 13

Flux emergence and Ellerman Bombs

courtesy Hardi Peter

Bi-directional flows not always present
Presence of absorbing Ni II line suggests 0.1 MK formed at low chromospheric heights
Sunday, November 10, 13

Flare evolution very complex with both red- andblueshifts present in closely neighboring locations
Mg II k 2796

Sunday, November 10, 13

Si IV 1403

SJI Si IV 1400

Flare evolution very complex with both red- andblueshifts present in closely neighboring locations
Hot (>10 MK) plasma present even in small C flares
Mg II k 2796

Mg II k 2796

Sunday, November 10, 13

Si IV 1403

Fe XXI 1354

SJI Si IV 1400

SJI Si IV 1400

Flare evolution very complex with both red- andblueshifts present in closely neighboring locations
Hot (>10 MK) plasma present even in small C flares
Mg II k 2796

Mg II k 2796

Sunday, November 10, 13

Si IV 1403

Fe XXI 1354

SJI Si IV 1400

SJI Si IV 1400

SJI Si IV 1400

Sunday, November 10, 13

See Viggo Hansteen’s talk this week

Short, small-scale and dynamic loops prevalent at the limb
Unresolved Fine Structure (UFS) resolved?

See Viggo Hansteen’s talk this week

Short, small-scale and dynamic loops prevalent at the limb
Unresolved Fine Structure (UFS) resolved?

SJI C II 1330

Sunday, November 10, 13

See Viggo Hansteen’s talk this week

Short, small-scale and dynamic loops prevalent at the limb
Unresolved Fine Structure (UFS) resolved?

SJI Si IV 1400Å

Sunday, November 10, 13

SJI C II 1330

Sunday, November 10, 13

See Viggo Hansteen’s talk this week

Short, small-scale and dynamic loops prevalent at the limb
Unresolved Fine Structure (UFS) resolved?

Diagnostic capabilities of NUV spectra

courtesy Tiago Pereira
Sunday, November 10, 13

Coronal line Fe XII 1349Å
IRISAIA Fe XII 193ÅHigh resolution spectral scans possible,
but line too faint for high cadence spectroscopy
Sunday, November 10, 13

Conclusions- IRIS functioning well: high resolution spectra and images
obtained daily- Preliminary analysis highlights include:- prevalence of high velocity events in chromosphere and TR- prevalence of twist and associated heating everywhere- UFS resolved?
- Mg II k/h excellent diagnostics of chromospheric dynamics
and energetics- connection between chromosphere and corona requires
high throughput, high cadence, high resolution spectra- IRIS data available at: http://iris.lmsal.com/search
Sunday, November 10, 13

Large FOV 2D spectroscopy important

courtesy Luc Rouppe van der Voort
CRISP / IRIS not same scale / cadence
Sunday, November 10, 13

Full disk mosaic Mg II k 2796Å

courtesy Scott McIntosh
Sunday, November 10, 13

Full disk mosaic Mg II k 2796Å
Intensity

VelocityLine width

Sunday, November 10, 13

courtesy Scott McIntosh