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Proposal ID Altrock_174

Date of Proposal May 1 1998

firstname
Richard

lastname
Altrock

institute
Air Force Research Laboratory

address
National Solar Observatory
Sacramento Peak
P.O. Box 62
Sunspot, NM 88349

email
altrock@sunspot.noao.edu

phone

fax
505-434-7029

proposal
Solar coronal holes are easily seen in images produced by the Extreme
Ultraviolet Imaging Telescope on the SOHO mission. The best contrast
appears to be in Fe XII 19.5 nm. Coronal holes are also seen in
"full-disk" maps produced from observations of Fe XIV 530.3 nm obtained
with the coronal photometer at the National Solar Observatory at
Sacramento Peak. The photometer is fed by the 40-cm coronagraph of the
John W. Evans Solar Facility. Such observations have been obtained
daily, whenever possible, since 1975. These maps are produced by
concatenating 14 days (or fewer, if interpolation must be used) of
scans of the corona made at 1.15 solar radii and projecting them onto a
sphere. Thus, an assumption is made of no evolution in the morphology
of coronal holes over a two-week period. Rigid solar rotation at the
Carrington rate is also assumed. This study will compare the
morphology of coronal holes as observed in the two lines on days
selected from the entire EIT database. This will test the assumption
of stationarity and rigid rotation of the corona as well as the issue
of whether ground-based observations might be used as a proxy to extend
the coronal hole data obtained by EIT to periods before and after the
SOHO epoch.

inside_collab
x

consortium
no

topic
Coronal Holes

topic
Coronal Holes

title
A Comparison of Coronal Hole Morphology as Observed with SOHO/EIT and the NSO/SP Coronal Photometer


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