SOHO/EIT CalRoc Intercomparisons
Jeff Newmark, Jean-Marc Defise (EIT)
Ken Dere (LASCO)
Craig DeForest (MDI)
Dominic Zarro (CDS)
Don Mcmullin (SEM)
Run on 16-Oct-97
Latest revision: 06-Oct-1997
Participating Instruments and Observatories:
EIT, LASCO, CDS, MDI, SEM
Background and Scientific Justification
The objective is to improve the EIT flatfield and provide an
The EIT space optics have been incorporated into a sounding rocket payload.
This instrument has been calibrated with the full program which was
planned for the SOHO EIT (but truncated by programmatics). Further
calibration checks will be applied immediately before and after launch.
This Intercal would be special observations during the approximately
2-3 hours around the time of the EIT CalRoc launch
from White Sands.
Overview of Observing Campaign
The EIT Calroc is currently scheduled to
launch at 18:10 on October 16. This program will run for a few
hours before and after the launch, see the detailed instrument plans
for specific timing. EIT requires telemetry submode 6 for this.
Participation is requested from, LASCO, EIT, SEM, MDI, and CDS.
EIT (Contact: Jeff Newmark, Jean-Marc Defise)
This is the main instrument for this ICAL. The rocket
flight will provide an improved flat field and an absolute calibration.
EIT - 17:00 synoptic set, 4 waves, full resolution, full field|
17:30-19:00 4 waves, full field, 2x2 binned
19:00 normal synoptic set
LASCO (Contact: Ken Dere)
LASCO will provide information concerning the outer corona
with a C1 FeX image at about 17:25.
MDI (Contact: Craig DeForest)
MDI will provide a good signal to noise full disk magnetogram.
This will require a sequence of images to co-add:
MDI - sequence = full disk magnetograms.
CDS (Contact: Dominic Zarro)
CDS will take quiet sun raster covering approximately 24"x32"
disk center field of view. Lines will include HeII, FeXII, FeXIV, MgIX
and other lines within the 1-2 million degree temperature range. This
will provide an excellent cross calibration.
CDS - 16:00-17:30 NIS 4'x4' context study (temperature, emission measure
diagnostics) INCLUDE HeII 304 in second order
17:30-18:50 GIS study - 24"x32" (4"x4" slit)
18:50-20:10 GIS study - 24"x32" (4"x4" slit)
SEM (Contact: Don McMullin)
The SEM measures full disk 304 intensities and provides
a good comparison with EIT. In addition to the SOHO SEM, there
will also be an SEM piggyback aboard the EIT Calroc.This will provide
a tool for atmospheric corrections. These observations provide an
excelent cross-calibration of the two instruemtns and a fundamental
point for the long term comparisons.
SOHO SEM - 15 second full resolution package.