JOP 124, Eruptive filament in active region

S.Regnier, J.Solomon, J.C.Vial
P.Lemaire (SUMER)
D.Pike (CDS)
J.P.Delaboudiniere (EIT)
F.Paletou (Themis, Tenerife)

Received 14 April 2000

Purpose

To find long period oscillations in active region filament, to obtain
temperature, density and magnetic diagnostics of the active region for
filament oscillations model.

Method

We plan to do long time observations (~7h) of a filament with a high
temporal resolution (less than 30s) in the HeI line at 584.33A (CDS,
SUMER), in the Halpha line (MSDP, Themis), in the HeII line at 304A
(CDS).  Temperature and density diagnostics of the active active is
obtain by CDS. An overview of the active region is made by EIT in the
FeXII line at 195A. Vector magnetic field is derived from MTR (Themis)
observations.

Scientific Objective

During the last MEDOC campaign, we have found with SUMER long period
oscillations in active region filament (a period range between 55min
and 2h20min) in the HeI line at 584.33A. We would like to have new
observational prove of these oscillations in several lines. On the
other hand, we compared observational periods with a prominence model
(Joarder & Roberts, 1992).  Some parameters could be observed as
temperature and density of the active region, the angle between the
filament and the magnetic field supporting the filament, the width and
the length of the filament.

References

Joarder, P.S., Roberts, B., 1992, A&A, 277, 225

Observing program

The target for all the studies is the same active region. SUMER and
CDS (studies 1 and 2) observe a filament in or near the active region.

SUMER : HeI at 584.33A
        temporal resolution : ~30s
        slit : 0.3"x120"
        no rotation compensation

CDS : 3 studies
      1- Context raster
         field of view : 2'x4'
         slit : 4"x240"
         3 lines : HeI at 584.33A, HeII at 304A, OIII at 599A
         duration : ~10min

      2- same lines
         slit : 2"x240"
         without raster
         temporal resolution : ~25s
         duration : ~12min (30 exposures)

      3- diagnostic
         slit : 2"x240"
         field of view : 240"x240"
         lines : HeI (584.33A), SiIX (349A and 341A), FeXVI (360A), OV (629A),
         NeV (359A and 572A), SiXI (604A and 580A), NeVI (562A)
         duration : 110min

EIT : FeXII at 195A (as CME_WATCH study)

This SoHO JOP will be coordinate with THEMIS observation (MTR, DPSM)
during the next MEDOC campaign (May 2000). "