Proposal ID Peres_32

Date of Proposal

96/09/24

firstname

Giovanni

lastname

Peres

institute

Istituto ed Osservatorio Astronomico di Palermo

address

Piazza del Parlamento, 1
90134 PALERMO
ITALY

email

peres@oapa.astropa.unipa.it

phone

(39) (91) 233 236

fax

(39) (91) 233 444

proposal

We plan to use the EIT data to characterize the morphology, density and temperature
structure and, if possible, the relevant variability of the north polar coronale hole,
namely the region where a steady, fast speed, solar wind is known to originate.

The EIT data of interest are those on the north polar coronal hole and above, in the
week form 16 to 22 of september 1996 and, in particular, the observations done for this
purpose, on the 18 and the 21, from 16:00 UT to 20:00 UT.

Beyond EIT observations, CDS and SUMER data of the north polar limb and above, collected
J.B.during observations made for this
purpose, will be used to provide a scenario of the phyical conditions from the chromosphere
to the corona.

At the same time UVCS has spent more than 80 hours (the entire time not taken by the
synoptic observations), during the week from 16 to 22 of september scanning the same
polar coronal hole, with different slit width and exposure integration times to get
analogous information on the outer part of the polar coronal hole, from 1.5 to 3.5
solar . The proposer was the UVCS lead scientist during such a week.

The scope is to get a detailed picture of the fast wind region, to study where and how
the acceleration to fast (more than 600 Km/s) speed takes places, and to compare the
observations with extant models of fast winds.

inside_collab

J.B. Gurman, J.-P. Delaboudiniere

consortium

no

topic

Solar Wind

topic

title

Origin and acceleration of the fast speed solar wind

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