Solar Prominence Properties derived from the UV-EUV

SUMER spectral atlas

Solar Prominence Properties derived from the UV-EUV

SUMER spectral atlas

S. Parenti, J.-C. Vial, P. Lemaire

IAS, Univeristé Paris Sud

The atlas: motivationThe atlas: motivation

To carefully determine the complex physical characteristics of the prominence.

• We use SUMER (high spatial and spectral resolutions) to build an UV-EUV spectral Atlas.

• A large spectral coverage in UV-EUV gives the coverage of a large range of temperatures (Chromosphere – Prominence Corona TR – Corona)

• Spectroscopic informations:o, FWHM dynamics

line Intensity N,T, Emission Measure, AX

First complete First complete atlasatlas between 800 a between 800 andnd 1250 1250 ÅÅ

The dataThe data• Prominence and QS 10/’99 (MEDOC #4)• Spectral range: 800 - 1250 Å (det A)• Observation time 5:30h• Spectral windows of 40 Å ( 20 in the kbr)

Ly

1 1

Ly

8

Ly

1 9

Ly

1 3

N I

I

Data processingData processing

• Determine the stray light contribution• Wavelength calibration for each spectral

window, for the QS and prominence independently.

• Multi-Gaussian line fitting of about 600 lines in each dataset.

• Line identification and radiometric calibration.• About 30 new lines identified (mostly from ions

at low ionization stage) between the QS and the prominence

I, o, FWHM

S. Parenti, J-C Vial, P. Lemaire, Sol. Phys, 220, 61, 2004

S. P

arenti, et al., 2004

The final productThe final product

The Differentiel Emission MeasureThe Differentiel Emission Measure

• Selection of observed lines intensities• CHIANTI (v 4.2) atomic database

(Mazzotta et al. Ion fraction; coronal abundances)

• Inversion technique to estimate DEM(T)• QS ; PRM1

dTTDEMTGIobs )()( dTdTdhNdTTDEM e2)(

The DEM: resultsThe DEM: results

Prominence A_1Quiet Sun

Non Thermal VelocitiesNon Thermal Velocities

2

MkT2 solarv

FWHMFWHMFWHM instsolarmeas

222

2ln22FWHMcv

• Lines from allowed transitions, well isolated and intense

• T is for the maximum ionization fraction. For the neutrals: Chae et al. 1998

Non Thermal Velocities: results

Non Thermal Velocities: results

Chae et al., A

pJ, 505, 957, 1998

Future workFuture work

• We have produced the first complete UV-EUV prominence atlas in the range 800 Å - 1250 Å

• Still 350 Å to be processed• We derived DEMs and NTVs for both QS and

prominence

physical interpretation• More physical properties to be derived..

Thank you Philippe!!!!Thank you Philippe!!!!

DEM in the prominence

Data processing