xxth GENERAL ASSEMBLY OF IUGG VIENNA (AUSTRIA)

NOTICES OF THE ASSOCIATION
GOLD MEDAL OF THE ROYAL ASTRONOMICAL SOCIETY (RAS]
Presentation of the Gold Medal for Geophysics & Planetary
Science: On February 9, 1990, the President of the RAS
presented Professor J W Dungey with the gold medal of the
Society. The citation spoke of Dungey's innovative researches
in the field of solar-terrestrial physics and particularly of
his having established the foundations of current
understanding of the magnetosphere and ionosphere. All members
of the IAGA community will join in congratulating Dungey on
this award.
CALL FOR CANDIDATE IGRF MODELS
The next revision of the International Geomagnetic Reference
Mode l [ IGRF] will take place at the Assembly in 1991. This
revision will consist of adoption of a definitive main field
model for epoch 1985 to replace the present IGRF for that
epoch, adoption of a main-field model (nondefinitive) for
1990, and adoption of a predictive model for the secular
variation for the interval 1990-1995.
Candidate models are solicited. Model coefficients should be
sent as soon a spossible to R A Langel, Code 922, Goddard
Space Flight Center, Greenbelt MD 20771, USA. The models
rece ived by December 1, 1990, will then be distributed to
interested parties for evaluation and comment.
Ground rules remain as before: the maximum degree and order of
main field models shall be 10 and the maximum degree and order
of the secular variation modrel shall be 8.
OPTICAl, CALIBRATIONS:
Airglow low light l evel sources
Hans Lauche writes t hat he continues to offer a service of
calibration of photometric standards, specifically those for
use in nightglow instruments. Everybody who needs calibration
of an airglow low-light- level source is invited to bring his
(or h er ) source to Lindau. Lauche plans to offer an
international cross-calibration facility (similar to the one
at Saskatoon in August 1987) in Vienna, during or adjacent to
the Union General Assembly. Please prepare for the transport
of sources, starting now.
Infor mation :
Postfach 20,
Germany).
Hans Lauche, Max-Planck-Insti tut fuer Aeronomie,
D-3411 Katlenburg-Lindau (Federal Republic of
Telephone 055 56 41-l Fax 055 56 4 12 40 Telex 965527/AERLI D
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