[IGSMAIL-2022] IAU Colq. 178 -- Polar Motion
Steve Dick
dick at ariel.usno.navy.mil
Wed Sep 16 08:36:05 PDT 1998
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IGS Electronic Mail Wed Sep 16 8:36:05 PDT 1998 Message Number 2022
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Author: Steve Dick <dick at ariel.usno.navy.mil>
Subject: IAU Colq. 178 -- Polar Motion
INTERNATIONAL ASTRONOMICAL UNION
STAZIONE ASTRONOMICA DI CAGLIARI - CARLOFORTE
UNIVERSITA' DEGLI STUDI DI CAGLIARI
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* IAU Colloquium 178 *
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* POLAR MOTION: HISTORICAL AND SCIENTIFIC PROBLEMS *
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* Cagliari University, Sardinia,Italy *
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* 27-30 September 1999 *
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FIRST CIRCULAR
GENERAL INFORMATION
The latest observations of the motion of the Earth's rotation pole
with respect to the terrestrial reference frame have achieved not only
remarkable accuracy, but these data are now being obtained with
subdaily frequency, a situation which was unexpected only a few years
ago. These circumstances call into question the very definition of the
celestial ephemeris pole. The astronomical observations available from
tracking the satellites of the Global Positioning System, laser ranging
to geodetic satellites, and very long baseline interferometry, together
with ocean and meteorological data of unprecedented accuracy and
frequency, may permit new understanding of the excitation of polar
motion. These new data, combined with a century of past observations,
provide further information on the secular motion of the pole which,
in turn, contributes to improved understanding of models for the
Earth's interior.
The year 1999 marks the centennial of the first observations of the
International Latitude Service (ILS). The ILS was organized in 1895
by the forerunner of the International Association of Geodesy and was
composed of observing sites on the parallel of 39d 88' North. The goal
was to make astronomical observations to describe the motion of the
Earth's rotation pole. In 1962 the ILS was renamed the International
Polar Motion Service (IPMS) and in 1988 the IPMS was discontinued when
the International Earth Rotation Service commenced. During its history
the ILS/IPMS provided valuable observations of polar motion which
continue to be analyzed today.
Many of the questions which the ILS was organized to address still
remain, including the enigmatic nature of the excitation and damping of
polar motion. The definition of the international celestial and
terrestrial reference systems are based on the ILS definition of the
pole. Today's precise astronomical and geodetic observations now
require a re-definition of that pole to correspond with modern levels
of measurement. It is fitting to take the opportunity to mark the
centennial of the first ILS observations at one of the original
observatories.
SCIENTIFIC TOPICS AND CALL FOR PAPERS
The Colloquium will include the following topics:
- History of early polar motion research
- History of the monitoring service organizations
- Evolution of astronomical observations
- Mechanisms for excitation of polar motion
- Secular polar motion
- Chandler motion
- Daily and subdaily polar motion
- Modern definition of the celestial ephemeris pole
- Outstanding problems in polar motion research
Invited, contributed, and poster papers will be considered. The
collected proceedings will be published.
Abstracts should be submitted by 10 April 1999 to the chairperson of
the SOC, Dr. Steven J. Dick, via e-mail (dick at ariel.usno.navy.mil).
Authors will be notified of acceptance by 30 May 1999.
SCIENTIFIC ORGANIZING COMMITTEE:
S. Dick (USA), chair Address: U.S. Naval Observatory
3450 Massachusetts Ave., NW
Washington, D.C. 20392-5420
U.S.A.
G. Beutler (Switzerland) D. McCarthy (USA)
N. Capitaine (France) E. Proverbio (Italy)
T. Fukushima (Japan) J. Vondrak (Czech Republic)
D. Gambis (France) Ya. Yatskiv (Ukraine)
The Colloquium is sponsored by IAU Commission 41 (History of Astronomy)
with support from Commission 19 (Earth Rotation) and 31 (Time). It is
co-sponsored by the International Association of Geodesy, the
International Earth Rotation Service, and the International GPS
Service.
LOCAL ORGANIZING COMMITTEE:
F. Fusi Pecci, co-chair E. Proverbio, co-chair
A. Poma P. Calledda
C. Pili S. Uras
T. Zanzu
LOCATION
The Conference will be held at the "Cittadella Universitaria", the new
settlement of the Cagliari University in the immediate outskirts of the
city, from Monday, 28 September through Thursday, 30 September 1999.
There will be an organized excursion to the original site of the ILS
station at Carloforte, on the little island of S.Pietro, about 90 km
from Cagliari.
Cagliari, situated on the southern coast at the center of the gulf of
the Angels, is the capital of the autonomous region of Sardinia and
offers many attractions in the fields of archeology, art, landscape
and climate. During the latter part of September the weather is
normally warm and sunny (the average temperature is around 24 deg C).
The Cagliari-Elmas airport is 7 km from downtown. All the main Italian
airports have frequent direct daily flights to Cagliari. In addition
several ferry-lines connect Italian ports (Genova, Livorno,
Civitavecchia) with Sardinia (Cagliari, Olbia, PortoTorres) daily.
A certain number of rooms are reserved at hotels located in the town
center. The approximate daily hotel rate is 50-110 US$ per person,
including breakfast.
The Conference fee will be 140 US$.
FURTHER INFORMATION AND DEADLINES
The second circular, which will be distributed in February 1999, will
contain details concerning submittal of abstracts and logistics.
Abstracts will be due no later than 10 April 1999.
A limited number of travel grants will be available. Those wishing to
apply for such a support are requested to complete and return the
attached form to the Chairperson of the SOC to arrive not later than
10 April 1999.
In the meantime, the latest information on the colloquium will be
posted at the Web site http://www.ca.astro.it/iau178.
CONTACT ADDRESS:
Local Organizing Committee
IAU Colloquium 178
Stazione Astronomica
Loc. Poggio dei Pini, Str. 54
09012 Capoterra (Cagliari)
ITALY
Telephone: ++39.070.725246
Telefax: ++39.070.725425
e-mail : iauco178 at ca.astro.it
To express interest in attending please fill in and return the enclosed
form to the contact address before 10 April 1999.
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IAU Colloquium 178
POLAR MOTION: HISTORICAL AND SCIENTIFIC PROBLEMS
Cagliari University, Sardinia, Italy
27-30 September 1999
PRELIMINARY REGISTRATION FORM
(To be returned before 10 April 1999)
To:
Local Organizing Committee
IAU Colloquium 178
Stazione Astronomica
Loc. Poggio dei Pini, Str.54
O9012 Capoterra (Cagliari)
ITALY
Telefax: ++ 39.070.725246
E-Mail:iauco178 at ca.astro.it
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I plan to attend the Conference ( ) yes ( ) no
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I intend to present a poster ( ) yes ( ) no
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IAU Colloquium 178
POLAR MOTION: HISTORICAL AND SCIENTIFIC PROBLEMS
Cagliari University, Sardinia, Italy
27-30 September 1999
APPLICATION FOR TRAVEL GRANT
(To be returned before 10 April 1999)
To:
Dr. Steven J. Dick
U.S. Naval Observatory
3450 Massachusetts Ave.,NW
Washington D.C. 20392-5420
U.S.A.
Telefax: ++ 202.762.1516
E-Mail:dick at ariel.usno.navy.mil
Name of applicant:....................................................
Nationality: ..........................Position:......................
Mailing Address:......................................................
......................................................
Telephone:.......................Telefax:.............................
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Starting point of journey:............................................
(if different from home address):
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(e.g. review talk, thesis presentation, ...)
Title of contribution:................................................
................................................
Total amount of IAU support applied for (in CHF)......................
Subtotal for travel (max.: economy air fare or equivalent):...........
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For Ph.D. students:
Signature of Thesis Director/Supervisor:.........................
Institution:.....................................................
[Mailed From: Jim Ray (USNO 202-762-1444) <jimr at maia.usno.navy.mil>]
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