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Proposal ID Neupert_77

Date of Proposal
97/02/18

firstname
Werner

lastname
Neupert

institute
Hughes/STX

address
Space Environment Center/NOAA
Code R/E/SE
325 Broadway
Boulder, CO, 80303

email
wneupert@sec.noaa.gov

phone
(303) 497-3274

fax
(303) 497-3645

proposal
Preliminary observations with EIT indicate the presence of small
but measurable temperature gradientsin the high corona over a decaying
active region observed on the Sun's West limb on Sept. 30 - Oct.4, 1996.
In contrast to low-lying loops(heights less than a pressure scale height)
which appear almost uniformly bright along most of their length and display
little or no evidence of changes in the ratio of intensities in the 195A
and 171A EIT bands and therefore temperature changes, higher loops and
apparently open features display both brightness gradients and at least
in a preliminary analysis, temperature gradients. We will examine and
characterize such loops associated with a small active region observed
by EIT from May, 1996 (CMP about May 12) to Sept. 1996 (CMP about Sept.21)
in all four EIT bands and compare them with the properties of lower
loops also present. Note that the usual loop scaling law applies strictly
only to loops with constant pressure (therefore low compared to the scale
height). We will also compare loop properties with the underlying
photospheric fields at their footpoints, although for this particular
region the results may be inconclusive as the fields recorded by MDI
were weak and no data were taken in MDI's high resolution mode. We
may also wish to examine Yohkoh/SXT data for this region to correalte
with higher temperature emissions. We will compare our results with
current models of coronal loops and solar wind propagation in the low
corona.

inside_collab
Inside_collaborators: R. Catura; D. Moses. J.Newmark, B. Thompson, F. Portier. and others who may wish to participate

consortium
yes

topic
Coronal Plasma

topic

title
Coronal Temperature Gradients over an Evolving Active Region

update added on 1998/07/02 at 13:09:46
Update:

A paper entitled "Observation of Coronal Structures above
an Active Region by EIT and Implications for Coronal Energy
Deposition" has been accepted for publication in Solar Physics.
Authors are W.M.Neupert,. J.Newmark, J.-P. Delaboudiniere,
B.J.Thompson,. R.C., Catura, J.D.Moses,. J.B. Gurman,
F. Portier-Fozzani, A.H. Gabriel, G. Artzner, F. Clette, P. Cugnon,
A.J. Maucherat, J.M. Defise, C. Jamar, P. Rochus, K.P. Dere,
R.A. Howard, D.J.Michels, S. Freeland, J. R. Lemen, and
R.A. Stern.

A preprint is available on request to Neupert at Code R/E/SE,
NOAA, 325 Broadway, Boulder, CO 80303.

Prior presentations of preliminary results on the same topic
were given at the Spring 1997 AGU meeting in Baltimore and the
Solar Physics Division Meeting in Bozeman.


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