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Proposal ID De Pontieu_116

Date of Proposal
97/06/26

firstname
Bart

lastname
De Pontieu

institute
Max-Planck-Institute for extraterrestrial physics

address
Giessenbachstrasse
D-85740 Garching-bei-Muenchen
Germany

email
bdp@mpe-garching.mpg.de

phone
+49 89 3299 3511

fax
+49 89 3299 3569

proposal
I would like to have EIT data of the northern polar limb with high
cadence (1 min?) in order to study limb spicules. These observations
would be in coordination (i.e. simultaneously) with observations using
CDS and the Vacuum Tower Telescope in Izana, Tenerife, for which I
have obtained observing time from August 6 and 10.

With CDS I have three studies, one for a 30x60 arcseconds area
with spatial resolution of 2 arcseconds and time cadence of 1.5
minutes and high spectral resolution in three lines (OIV 554.5,
OV 629.7 and HeI 584). The second study looks at a 40x60 arcseconds
area with spatial resolution of 2 to 4 arcseconds and time cadence
of 1 minute in the same lines. The third study looks at a 90x60
arcseconds area with time resolution of about 8 seconds, with little
spectral resolution.

In Tenerife I intend to observe Halpha spicules at the northern limb,
by rastering a large area. Time cadence will be of the order 20
seconds or so.

The aim of the project is to spatially coalign images taken with CDS
with the ones from Tenerife, and basically study temporal and spatial
correlation between Halpha spicules and their EUV counterparts, on
a one-to-one basis (i.e. not in a statistical way!). This hasn't
been done before, and if it succeeds, it will shed light on how
spicules are heated, to what temperatures and at what rates they
are heated. It can also shed light on the ultimate fate of spicules,
especially whether and how much material descends and at what stage
of the spicule's lifetime.

To ensure reliable co-alignment of the ground-based observations
with CDS (and its relatively small field of view, due to time-
constraints), having high cadence EIT images taken at the same
time, of the same area, would be highly beneficial and necessary.
I intend to use the EIT images to help the identification of the
EUV-spicules with the H-alpha spicules observed from Tenerife.
A high time cadence of 1 minute is necessary, given the dynamic
character of H-alpha spicules, which have typical lifetimes of 5
to 10 minutes.

I have contacted Barbara Thompson for help with the EIT observations.
Your comments on whom else to contact from the EIT consortium are
very much welcomed!

inside_collab
Barbara Thompson

consortium
no

topic
Spicules

topic

title
Dynamical study of limb spicules simultaneous with CDS and VTT Tenerife


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