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SOHO & the February 26 Eclipse
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Latest Images from SOHO instruments (LASCO, EIT, CDS, UVCS)continuously updated
SOHO supports several eclipse expeditions with
coordinated observations during the upcoming Solar Eclipse on February 26, 1998.
(For SOHO, in orbit around L1, the Sun will of course not be occulted.)
A summary table of observing requests per instrument, followed by a description
of the observing plans per instrument is listed
here.
Links to individual SOHO instrument eclipse homepages:
Contact: Piet Martens, SOHO Science Operations Coordinator
soc@esa.nascom.nasa.gov
Eclipse Information:

SOHO Supported Eclipse Expeditions
NSO/HAO/Michigan State/Rhodes College/Lindau expeditions
CONTACT PERSON: Phil Judge (judge@jabba.hao.ucar.edu
)
INTITUTIONS:HAO/NSO/MICHIGAN/RHODES COLLEGE/LINDAU
LOCATION: Curacao and on an NCAR C-130 aircraft
ECLIPSE TIMES:
CIRCUMSTANCES OF ECLIPSE AT SABINE WESTPUNDT, CURACAO
Duration of Totality = 3 m 34 s
Time of mid Totality = 18:13:11 UT
Second Contact = 18:11:26 UT
Third Contact = 18:14:56 UT
The orientation of the Sun on 26 February is :
P angle = -20.77 deg
B angle = -7.18 deg
apparent Radius = 16 arc min 9.01 arc sec
GOAL OF OBSERVATIONS:
1. Determination of vector coronal magnetic field
2. Detection of forbidden lines, such as Si IX at 3.92 microns
TYPE OF OBSERVATION:
1. coronal emission line polarimetry in the FeXIII line at 1074.7 nm
2. white light corona with 4000^2 CCD
3. Measurement of polar plumes
4. Mesurement of lines further in infrared and F-corona (from aircraft)
SOHO OBSERVATIONS REQUIRED:
MDI: Magnetograms
EIT: Synoptic data in Fe IX, Fe XII and Fe XV channels
CDS: Fe XIII, Si IX rasters
SUMER: TBD
LASCO: White light and Fe XIV data from C2
UVCS: TBD in conjunction with UVCS team
NOTE: for details, see SOHO
JOP071
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Royal Metereological Institute of Belgium
CONTACT PERSON: Frederic Clette ((Frederic.Clette@ksb-orb.oma.be)
INSTITUTIONS: Royal Metereological Institute of Belgium
LOCATION: NW of Curacao Island (Kadushi Cliffs)
ECLIPSE TIMES: close to those of 1.
GOAL OF OBSERVATIONS: absolute determination of the electron density distribution
from 1 to 3 Rsun
TYPE OF OBSERVATION: white-light polarization (photographic and CCD)
SOHO OBSERVATIONS REQUIRED:
LASCO: simultaneous polarimetric observations from C1 and C2 would allow a
cross-calibration of both data sets in the range 1.1 to 3 Rs
EIT: simultaneous synoptic images
SUMER: Limb at 1025 to 1045 Å. For details see the
write-up
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ESA/SSD Eclipse Expedition
CONTACT PERSON: Bernard Foing (
(bfoing@estec.esa.nl)
INSTITUTIONS: Solar System Division of ESA/SSD
LOCATION: Pointe a Pitre, Guadeloupe
ECLIPSE TIMES: First contact at Pointe-a-Pitre: 17:05:07. Totality
at 18:31:05 to 18:34:00 UT
GOAL OF OBSERVATIONS:
1) Determination of equivalent coronal densities and temperature in coronal
plumes and streamers
2) High resolution coronal observations in stereo with SOHO
3) Measure of extended cool material distribution in the corona in H alpha
TYPE OF OBSERVATIONS:
A) Automatic Meade 25 cm Photometrics PXL CCD camera and filters/objective
grating
B) Automatic Meade Photometrics series with 300 CCD 2kx2k camera + H alpha
tunable filter
C) Additional support imaging with Celestron 5 telescope and Vixen GPDX
refractor
SOHO OBSERVATIONS REQUIRED:
LASCO: simultaneous C1 and C2
EIT: synoptic
SUMER: prominences in He and Lyman lines
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Williams College Eclipse Expedition
CONTACT PERSON: Jay Pasachoff (
jmp@williams.edu)
INSTITUTIONS: Williams College, Williamstown, Massachusetts
LOCATION: Aruba
ECLIPSE TIMES: 18:08:45 - 18:12:15 UT (totality)
a search for 1-Hz oscillations in the coronal green line; a coronal
temperature map through the Cram method of comparison of ultraviolet
bands sensitive to the Doppler broadening of the photospheric
absorption spectra at coronal temperatures; and a set of CCD images
through a green continuum filter closely matching one of the bands on
the LASCO C1 coronagraph and with a similar field of view. The last
observation, in collaboration with Guenter Brueckner, should provide a
scattered-light calibration for that coronagraph.
SOHO OBSERVATIONS:
LASCO: C1 at 18:10 UT, C2 and C3
EIT: Synoptic
Full link at: IAU Eclipses
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NSF, SAO, GSFC Eclipse Expedition
CONTACT PERSON: Shadia Habbal (
shabbal@solar.stanford.edu)
INSTITUTIONS: Smithsonian Astrophysical Observatory, Goddard Space Flight
Center, Jet Propulsion Laboratory
LOCATION: Guadeloupe
ECLIPSE TIMES:Totality at Pointe-a-Pitre, 18:31:05 to 18:34:00 UT
GOAL OF OBSERVATIONS: Electron densities and temperatures in streamers
and coronal holes, elemental abundances, magnetic field
directions, and calibrations
TYPE OF OBSERVATIONS: Photometric observations of the Fe
lines: 7892, 6374 and 5303 A
SOHO OBSERVATIONS REQUIRED:
UVCS: Polarized Brightness (pB) of the K-corona between 1.8 and 3.0 Ro,
UV channel: Ly-alpha, -beta, O VI and Si XII doublets
LASCO: C2 and C3 pB in white-light from 2.2-30 Ro, C1 Fe xiv (5303), Fe x (6374),
and pB at 5303
Coordination with SOHO, VLA, and radio occultation measurements during
the superior conjunction of the spacecraft Galileo which is orbiting Jupiter
Full description: here
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Institut d'Astrophysique, Paris - CNRS Eclipse
Expedition
CONTACT PERSON: Serge Koutchmy (
koutchmy@iap.fr)
INSTITUTIONS: Institut d'Astrophysique, CNRS
LOCATION: Guadeloupe, Guery, Grande-Terre
ECLIPSE TIMES:Totality at 18:31:05 to 18:34:00 UT
GOAL OF OBSERVATIONS: Morphological Imaging Analysis, Spectroscopic Analysis,
Green Line (Fe XIV) polarisation with Sac Peak, White
Light polarization with IZMIRAN
TYPE OF OBSERVATIONS: Low spectral resolution slit- spectra, images
SOHO OBSERVATIONS REQUIRED:
EIT: Full disk in 304 (HeII/SiXI) at 18:32:30 UT (+/- 1 mn), and in coronal
lines at +/- 15 mn
LASCO: Green line (530.3 nm) at 18:30 +/- 15 mn, if possible with polarization
analysis. Synoptic C2 and C3
SUMER: O VI, Lyman Beta and the C II lines at 1.1 to 1.3 Ro above the pole.
Up to 24 hours before or after totality
Full description: here
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Last modification: Friday 20 February 1998