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Proposal ID Solanki_56

Date of Proposal
96/12/18

firstname
Sami

lastname
Solanki

institute
Institute for Astronomy

address
Institute for Astronomy
ETH_Zentrum
CH-8092 Zurich
SWITZERLAND

email
solanki@astro.phys.ethz.ch

phone
+41 - 1 - 632 3810

fax
+41 - 1 - 632 1205

proposal
JOP 55

Coronal holes are enigmatic structures. Fundamental parameters of
the coronal palsma such as temperature, density, solar wind
velocity, etc. change drastically over a short distance at the
edge of the hole and retain the new value over large parts of the
solar surface. They also have a significantly lower differential
rotation than the photospheric plasma. This is intriguing since
it implies that in some cases at least coronal holes move relative
to the underlying photosphere and hence are not always bounded by
the same field lines. If this picture is correct it would imply
reconnection processes taking place at the coronal-hole
boundaries.

The main aims of this JOP are to determine the basic properties of
coronal holes and their boundaries as a function of temperature
and height. We also hope to determine which is the lowest
temperature at which coronal holes are visible and search for
relations between the presence of coronal hole and the underlying
magnetic field.

Both disk (CDS, SUMER, EIT, MDI) and off-limb (SUMER, CDS, UVCS)
observations will be used. EIT will provide the global view,
putting the observed regions into context within the geometry of
the complete coronal hole and the rest of the solar disk.

inside_collab
J. Gurman

consortium
no

topic
Coronal Holes

topic
Coronal holes

title
Coronal holes versus normal sun (JOP 55)


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