Received:  15 August 2000


			JOP 126


Title: Active region non-thermal velocities and dynamics

Author: L.K. Harra, S.A. Matthews, K. Ichimoto, H. Hara and T Watanabe

Participating SOHO instruments: EIT/TRACE/SXT/Norikura Observatory

Scientific Objective: To observe the line broadening and flows in an active
region with Norikura Observatory in coronal lines. We intend to use
the coronal red and green line. The excess line broadening in active
regions is not fully understood. Various attempts have been made to
determine whether it is due to waves or flows. We wish to use the high
spectral and time resolution of Norikura to obtain spectral
information alongwith high spatial and time resolution imaging
data from EIT/SXT and TRACE to obtain information on dynamics. 
Combining the information will provide information on flows along
the line of sight and perpendicular to the line of sight simultaneously.

Scientific Justification: We have attempted this observation
previously but had problems with bad weather at Norikura.


Proposed dates:6-20 Sep (22:00-06:00 UT)

Operational Considerations: observing an active region, preferably on the 
west limb. I will chose the target. I won't be at GSFC at that time
since we are holding a summerschool at MSSL during this time period.

Observing sequences: 

Using EIT (CME watch) - whatever is available 

TRACE predominantly Fe IX/X with other lines interleaved - time
cadence faster than 4 mins, and FOV 6 arcmins. We are interested in
small details. Target to be chosen before 18:00 UT on the previous day.

CDS - study FL_AR2 will be run from 22:00 to ~01:00 UT (SYNOP to be
moved by an hour or so during this study) with a time cadence of 
~3.5 mins. The location should be at
the top of the loop system in the active region. Need to know the
target by 14:30 UT the day before the observation.

Norikura - predominantly the Fe X line - FOV 500 x 200 " and time
cadence ranging between 10-30 mins.

EIT, TRACE, Norikura, SXT and CDS have agreed for this time
period. EIT may be switched off for several days during this. 

I will send the target to everyone by 09:00 UT the day before the
observing during the observing period.



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Louise Harra                         Email: lkh@mssl.ucl.ac.uk
Solar Physics Group                         
Mullard Space Science Laboratory     Phone: 44 (0) 1483 204141
University College London            Fax:   44 (0) 1483 278312  
Dorking, Surrey, RH5 6NT, UK                   
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