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Dear all:<br>
<br>
Please find a recent paper on Asymmetries in Coronal Spectral Lines
and Emission Measure Distribution, <br>
which Jim and Myself have recently submitted to ApJ. The abstract is
appended below:<br>
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<p><span style="font-size: 12.000000pt; font-family: 'CMR12'">Abstract:
It has previously been argued that 1. spicules do not
provide enough preheated plasma to <br>
fill the corona, and 2. even if they did, additional
heating
would be required to keep the plasma hot <br>
as it expands upward. We here ad-
dress the question of whether spicules play an important
role by <br>
injecting plasma
at cooler temperatures (</span><span style="font-size:
12.000000pt; font-family: 'CMMI12'">< </span><span
style="font-size: 12.000000pt; font-family: 'CMR12'">2
MK), which then gets heated to coronal values at
higher <br>
altitudes. We measure red-blue asymmetries in line
profiles formed over
a wide range of temperatures <br>
in the bright moss areas of two active regions.
We derive emission measure distributions from the excess <br>
wing emission. We
find that the asymmetries and emission measures are small
and conclude that
spicules <br>
do not inject an important (dominant) mass flux into the
cores of active
regions at temperatures </span><span style="font-size:
12.000000pt; font-family: 'CMMI12'">> </span><span
style="font-size: 12.000000pt; font-family: 'CMR12'">0</span><span
style="font-size: 12.000000pt; font-family: 'CMMI12'">.</span><span
style="font-size: 12.000000pt; font-family: 'CMR12'">6 MK
<br>
(log </span><span style="font-size: 12.000000pt;
font-family: 'CMMI12'">T > </span><span
style="font-size: 12.000000pt; font-family: 'CMR12'">5</span><span
style="font-size: 12.000000pt; font-family: 'CMMI12'">.</span><span
style="font-size: 12.000000pt; font-family: 'CMR12'">8).
These conclusions apply not
only to spicules, but to any process that suddenly heats
and <br>
accelerates chromospheric plasma (e.g., a chromospheric
nanoflare). The traditional picture of
coronal <br>
heating and chromospheric evaporation appears to remain
the most likely
explanation of the active region <br>
corona.
</span></p>
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