[natphil] Invitation to the 2022 J. Tuzo Wilson Lecture on Feb 23rd 4:10 pm

[The J Tuzo Wilson Lecture mailing list]

Dear Tuzo Wilson Lecture Subscribers,

You are cordially invited to join the 2022 J. Tuzo Wilson Lecture at
University of Toronto (virtually) on February 23rd at 4:10 pm. The annual
Tuzo Wilson Lecture commemorates the life and work of J. Tuzo Wilson
(1908-1993), one of the great earth scientists of his time, and one of the
founders of Geophysics in Canada. Wilson made decisive contributions to the
revolution in the Earth Sciences brought about by the establishment of the
plate tectonics paradigm in the '60s and '70s.

This year, we are very fortunate to have invited Prof. Catherine Johnson
from University of British Columbia to give the following Lecture:
====
Title:  The Ins and Outs of Terrestrial Planets: A Magnetic Field
Perspective
Speaker: Prof. Catherine Johnson
Affiliation: University of British Columbia & Planetary Science Institute
Date: Wed, Feb 23, 2022
Time: 4:10-5:30pm EST

You can join us either through zoom link:
https://us06web.zoom.us/j/87675012980?pwd=Zk82QzdFYVByRThPWXdQaFYvdG9TQT09
where you may be asked to provide your email address and name before
attending (note no password is needed)

or just watch on the Department of Physics Youtube live stream on the date
and time of the Lecture:
https://www.youtube.com/channel/UCH2J2YJx3nfN1KygnB1ub4w/live

Abstract: Planetary magnetic fields provide indirect, but fundamental,
constraints on the internal structure and evolution of terrestrial
planetary bodies. The presence of a global magnetic field, generated in a
metallic core today or in the past, is intimately tied to core composition,
structure, and the cooling history of a planet. Crustal magnetization
yields a record of the net effects of the dynamo history, silicate iron
mineralogy and processes that have modified the crust over time. The
interaction of a planet, its atmosphere and any crustal or core magnetic
field with the solar wind results in time-varying fields that can be global
or local in spatial scale, and periodic or transient in nature. These can
induce electrical currents in the planets interior that result in secondary
magnetic fields. Such secondary induced fields are sensitive probes of
interior electrical conductivity structure that in turn depends on
temperature and composition, in particular volatile content. Over the past
decade new data sets, sensitive laboratory techniques and advances in
modeling have clearly shown that Mercury, Venus, Earth, Mars, and the Moon
each possess unique magnetic field characteristics, providing key insights
into the diversity of planetary histories in our own Solar System and
beyond. Here I will review some recent discoveries, highlighting
outstanding puzzles.

[image: Graphic.jpg]

Bio: Professor Catherine Johnson is a Professor of Geophysics at the
University of British Columbia, Vancouver and a Senior Scientist at the
Planetary Science Institute, Tucson. Her research focuses on understanding
the structure and interior evolution of terrestrial planets, moons and
asteroids. She was a Participating Scientist on the MESSENGER (Mercury)
mission and is currently a Co-Investigator on the InSight (Mars) and
OSIRIS-REx (asteroid Bennu) missions. She is a fellow of the AGU and in
2019 was the recipient of the Price Medal of the Royal Astronomical Society
and the IAGA Shen Kuo Award.
===

You can also find more information about the talk on the attached
poster at:
https://tuzowilson.physics.utoronto.ca/j-tuzo-wilson-lecture-series/the-ins-and-outs-of-terrestrial-planets-a-magnetic-field-perspective/
as well as.

Please let us know if you have any questions. Feel free to spread the word
and we look forward to seeing you all at the Lecture on Feb 23rd (Wed).

Qinya Liu
--------------
Associate Professor of Geophysics
Department of Physics & Department of Earth Sciences
University of Toronto
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