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Proposal ID SCHMIEDER _65

Date of Proposal
97/01/17

firstname
BRIGITTE

lastname
SCHMIEDER

institute
Observatoire de PARIS

address
Observatoire de Paris
Section Meudon, URA 2080
92195 Meudon Cedex Principal
France

email
schmieder@onbspm.fr

phone
33 1 45 07 78 17

fax
33 1 45 07 79 59

proposal

Persons concerned:

Brigitte Schmieder, Pierre Mein, Jean-Marie Malherbe,
P. Demoulin, J.E. Wiik, and Lidia van Driel-Gesztelyi, J.C.Vial
T. Kucera and A. Poland, Neupert

Since observations of multiple layers of the solar atmosphere are
required to understand such eruptions or
disparition brusque (Schmieder 1992, Raadu and Schmieder
1988), we propose to study combined data on disparition brusques from
the corona (Yohkoh/SXT), the transition region (SOHO/CDS, SUMER, and
EIT ), the chromosphere (MSDP, Tenerife), and the photosphere (SOHO/MDI).
MSDP provides spectral data in Halpha and Ca lines
in 2 D (typically 0.5 by 4 arc min)


Past observations:

We obtained good data during the coordinated filament campaigns (JOP 17) with
Yohkoh and SOHO in the periods June 3-9, 1996, and September 20-29, 1996.
In June, the MSDP spectrograph at the Pic Du Midi telescope observed
active regions and filaments (Malherbe, Roudier). In September, three
telescopes in the Canary Islands were involved in an international
ground-based campaign: the German telescope VTT with our MSDP spectrograph
(P. Mein, Schmieder, Malherbe), the Gregory (Magnetic field - Germans from
Freiburg, the Swedish telescope (Engvold and J.E. Wiik).
Successful observations were also made by CDS and SUMER instruments on SOHO
(T.Kucera and A. Poland) and by the SXT on Yohkoh.

Future Observations:
We plan to have two weeks of campaigns in 1997 one in June and one in
September and we hope that MDI could support them. After some preliminary
work on the existing data we would be able to be more precise in our request.
According to the results of dec of EIT we would suggest to have a high cadence
of observations in He 304 A in order to be able to see
CME associated to filament eruption.


Planned use of EIT data:
The EIT full disk
images are firstly very useful to co-align SUMER and CDS images with
Halpha data.
We plan to extrapolate the magnetic field maps with technics developed by
P.Demoulin observed by MDI and compared the field lines with the
loops observed at different temperatures from the
transition zone to the corona. EIT with Yohkoh/SXT would provide
images of fine structures of filaments
covering this range of temperature over a large field of view.
The filament that were observed are 3 times larger than the SUMER/CDS
field of view.
.

We observed some disparition brusque and a large loop with Yohkoh
on September 25-26, large filament and emerging flux
near disk center on June 7-9.

inside_collab
Joe Gurman and J.P.Delaboudiniere

consortium
no

topic
Filaments

topic

title
Global analysis of the magnetic field evolution
during the period of instability of a filament.

update added on 2001/03/16 at 06:22:59


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