SOHO and the 2001 Eclipse

CDS Support observations

To the SOHO Eclipse 2001 page

From the Operations Scientist Memo

(Instructions to the weekly science planner)
DATE: June 20, 21, 22, 2001 
WHO: Richard Harrison in collaboration with Ken Phillips, Leon Golub
and Ed Deluca.
ACTIVITY: This activity is designed to support the Golub eclipse
rocket and the Phillips SECIS eclipse observations (Africa). The
Eclipse rocket looks at the range 171-211 Angstrom with 1 arcsec
resolution over the full disk. Also, it has 3 arcsec imaging in three
bands. SECIS is a ground based system looking for rapid coronal
events. It would be beneficial to coordinate with TRACE, to
concentrate on more than one active region in the eclipse period. The
planned observation has similarities to the August 1999 eclipse
observation. The basic plan is the following:

1. Run the eclipse 'doughnut' observation as on Agust 10 and 11, 1999,
consisting of a ring of STRE4W rasters (var. 72). This can be done
before and after the eclipse period (interrupted by items 2 and 3, below).
Run STRE4W (ID 11, var. 72) at 32 pointings defined in a separate
e-mail by Andrzej. Copy 'Eclipse support' study from mk_plan on 10 and
11 August 1999. Run 16 pointings (20 hours 20 min) before the SECIS support
(approx. from 20 June 15:00 UT until 21 June 12:00 UT), 16 pointings
(20 hours 20 min) after the SECIS support and TXI rocket support (from
21 June, 20:00 UT until 22 June, 17:00 UT).

2. Run two AZ_DDEP1 (var 67) observations of two selected active
regions above the limb centered on the eclipse time, approx. between
12:30 UT and 15:30 UT (can be in the middle of the 'doughnout run'.
The preferred SECIS target will be communicated from Peter Gallagher
at BBSO to Ken Phillips in Africa and to the CDS team at Goddard and
RAL (Peter Gallagher - Peter will send potential
target information to the planners from the 18th in a daily message at
about 16:00 UT. Again, it would be good for TRACE and CDS to use the
same targets. The preferred target has to be an active region on the

3. Run TXI rocket studies from 15:45 UT to 19:45 UT 
NIS4W (ID 11, var. 62) - point to a non-flaring active region on the disk
Duration: 2 hours
GIS11W (ID 30, var. 3) - 20 s exposure. Point to the same AR inside
the NIS4W area.
Duration: 2 hours, including lookup table upload

4. Continue 'doughnut', STRE4W (var.72), from 20:00 UT on June 21

5. Run a full Sun USUN_6 (var. 2) on June 22 after the sequence. 

CONTACT INFORMATION:  Dr Habatwa Mweene, Head of Physics at Uiv of
Zambia (contact for Ken Phillips) - Phone +260 1 291777 ext 2513/2514,
fax +260 1 293 592. E-mail or
DURATION: about 2 days total.