1999 Eclipse Observations
The SOHO Solar Observatory supported the many ground based observers for the August 11th Eclipse.
From its unique advantage point, some 1.6 Million kilometers from the Earth, and sunward of the Moon, the instruments on SOHO provided realtime data throughout the day.
The main SOHO web site contains details of the SOHO Eclipse support events
CDS Eclipse support images:
"A Ring around the Sun"
The following 3 mosaics were produced over two days, surounding the eclipse period.
He I 584A
Ca X 558A
Mg IX 368A
The following 3 images are of offlimb scans leading up to and including
the period of totality in Bulgaria.
NW Limb at 09:00UT
NW Limb at 10:34UT
NW Limb at 12:31UT
THE CDS ECLIPSE SUPPORT PLAN:
TITLE: ECLIPSE SUPPORT OBSERVATION
DATE: 11 August 1999
WHO: Richard Harrison
SCIENCE PLANNER: Jack Ireland
ACTIVITY: Coronal scans during totality, in the EUV, to support the ground-based coronal structure and dynamics observation s by the SECIS instrument group - Dr Ken Phillips in Bulgaria
Also, to perform full Sun and other large area scans for context before and after the eclipse time.
The programme is:
Tue Aug 10 Eclipse support - Off Limb Scan (see end of this Section)**TITLE: ECLIPSE SUPPORT OBSERVATION (SECIS support)
DATE: 11 August 1999
09:00 to 12:30 UT - SECIS support, run AZ_DDEP1 (Study ID 11, var 71 -
4x4 arcmin raster with 4x240 slit, 1h 33m) at 1.1R on SECIS target area.
Then run AZ_DDEP2 (Study ID 11, var 72 - 4240 slit, 4x4 arcmin raster, 1h
56m) centred at 1.3R over SECIS target region. SECIS target to be decided by
Phillips and Gallagher - most likely the brightest active region on limb.
SECIS totality is at 11:11 UT.
**TITLE: ECLIPSE SUPPORT - OFF LIMB SCAN
A doughnut shaped (or part doughnut shaped) set of 4'x4' rasters
around the limb. Run STRE4W (ID 11, var. 72) at 32 pointings defined
in a separate e-mail by Andrzej. 16 pointings (19 hours) before the SECIS
support (approx. from 10 August 12:00 UT until 11 Aug 08:00 UT),
16 pointings (19 hours) after the SECIS support (from 11 Aug, 13:00 UT
until 12 August, 09:00 UT).
LINKS & INFORMATION:
UK ECLIPSE Group - The official UK eclipse web site
BBC News Sites: