JOP 133 Theoretical Lines Profiles of Metallic Elements with Macroscopic 
        Velocities

Received 19 September 2000
Updated 20 September 2000

Authors:

D. Cirigliano,(IAFE, Buenos Aires/IAS)
Daniela.Cirigliano@medoc-ias.u-psud.fr
A. Costa (IAFE, Buenos Aires) costa@iafe.uba.ar
M.Rovira (IAFE, Buenos Aires) rovira@iafe.uba.ar
J-C Vial (IAS) vial@ias.fr
K. Bocchialini (IAS) karine@medoc-ias.u-psud.fr
 
Instruments of SOHO:  SUMER/ CDS

Target:  Quiet Prominence

Purpose:

               To study and obtain line profiles for several states of
ionization of the Carbon, Silicon, Oxygen, Helium and Nitrogen atoms for a
model of thread prominences including the effects of macroscopic velocities.
 

Introduction:

             We developed a numerical code to solve the ionization equilibrium
equation for a given atom and a given atmosphere. The population for the
different stages of ionization, the source function, and the optical depth can
then be obtained for different intensities and configurations of the flux
mass.

            The line profiles are deduced in order to obtain patterns that can
be compared with observations.

            This method can be applied to any atom and any atmosphere, and the
purpose of this JOP is to study several states of ionization of many atoms
using the model of thread prominences developed by Fontenla and Rovira.

            These models consider a collection of slabs in energy balance with
the surrounding corona and submitted to illumination from the underlying
chromospheric layers. The models are isobaric, but temperature variations
within the slab occur as a result of the energy balance constraint.   

References:

     Fontenla, J.M., Rovira, M., Sol.Phys, 96, 53, 1985.
     Rovira, M., Fontenla, J.M., Sol.Phys, 106, 351, 1986.
 

Scientific Justification:

             We would like to observe lines profiles for each line and compare
them with the theoretical lines profiles resulting from the calculations using
our prominence model.

             In order to determine the physical parameters which are present
in the prominence, it's very important to observe many lines at the same time.
Doing so, we would like to find a prominence model that could fit
simultaneously several observed profiles. We have chosen this elements
because, for the moment, our code calculate the line profiles only for them.

Scientific Objective:

We plan to observe a quiet prominence in several lines of C, Si, N, He, Ne and
O (SUMER/CDS).

SUMER:

List of desired lines

        HeI at 584.33A, HeII at 992,33A

        CI at 1139,09A, CII at 1010,37A, CIII at 977,02A, CIV at 1548A,
        CIV at 1555A

        OI at 1028A, OII at 834,46A, OIII at 835,29A, OIV at 790,19A, 
        OV at 760,44A, OVI at 1031,92

        NI at 1134,98A, NII at 916,70A, NIII at 991,57, NIV at 765,14A

        SiI at 1161,35A, SiII at 1131,65A, SiIII at 1113,22A, SiIV at 933,

        (no rotation compensation)
 

CDS :

List of desired lines

        He I at 537,030A, He I at 584,334A, He II at 607,559A

        C III at 538,299 A

        O II at 616,309 A, O III at 599,596 A, O IV at 554,512 A, 
        O V at 629,732 A

        Ne IV at 543,881 A, Ne V at 572,311, Ne VII at 562,802A

Observing Program:

SUMER:

Element  Wavelength(A)  Slit   T exposure  Obs. Time
       		       	     		   
-----------------------------------------------------
He I       584,33       1x120     10s        5 min
He II      992,33       1x120    150s       15 min
-----------------------------------------------------
C I       1139,09       1x120    150s       15 min
C II      1010,37       1x120    100s       10 min
C III      977,02     0.3x120     10s        5 min
C IV      1548          1x120     50s       10 min
----------------------------------------------------
O I       1028          1x120     100s      10 min
O II       834,46       1x120     100s      10 min
O III      835,29       1x120      30s      10 min
O IV       790,19       1x120      30s      10 min
O V        760,44       1x120     100s      10 min
O VI      1031,92       1x120      10s      10 min
--------------------------------------------------- 
N I       1134,98       1x120     150s      15 min
N II       916,70       1x120     100s      10 min
N III      991,57       1x120      30s      10 min
N IV       765,14       1x120      50s      10 min
---------------------------------------------------
Si I      1161,35       1x120     150s      15 min
Si II      131,65       1x120     200s      15 min
Si III    1113,22       1x120      50s      10 min
Si IV      933,38       1x120      50s      10 min
--------------------------------------------------
 

CDS:

Spectrometer:           Normal Incidence
Slit:                   2 x 240 arcsec
Raster Area:            240 x 240 arcsecond
Step (DX)               2 arcsec
Raster Locations:       120 x 1

Lines:

     all lines observed with NIS-2

         He I at 537,030A, He I at 584,334A, He II at 607,559A

         C III at 538,299 A

         O II at 616,309 A, O III at 599,596 A, O IV at 554,512 A, 
         O V at 629,732 A

         Ne IV at 543,881 A, Ne V at 572,311, Ne VII at 562,802A