Electromagnetic and Light Scattering by Particles
N e w s l e t t e r
July 2024
Issue 120
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Joop W. Hovenier (September
9, 1936 - July 12, 2024) Professor Dr. Joop W. Hovenier passed away on
July 12th, 2024. He dedicated his working life to radiative
transfer and light scattering: it will be very hard to find someone in this
field that has never read one of his papers. Professor Hovenier started working on polarized light
at Leiden Observatory in 1967. His PhD supervisor, Henk van de Hulst, had
shown him a plot of the polarization of Venus as a function of the phase
angle and Joop had agreed to work on a good interpretation of these
observations in terms of the microphysical properties of the cloud particles.
He soon realized that there were only three fundamental symmetry principles
governing the scattering of polarized light. He documented this fundamental
result in his first paper, published in 1969. These insights enabled the
efficient computer calculations of multiple light scattering that proved
crucial for his next endeavor. After defending his PhD-thesis 'Polarized
Light in Planetary Atmospheres' in 1970, Joop collaborated on the
interpretation of the Venusian polarization with Dr. James Hansen of NASA's
Goddard Institute for Space Studies (GISS). The result was the famous 1974
paper entitled 'Interpretation of the Polarization of Venus', which showed
that the Venusian cloud droplets differed little in size, had an effective
radius of 1.05 microns, and consisted of sulfuric acid solution.
That paper still pertains to a spectacular achievement in planetary remote
sensing and has been cited more than 350 times. In the meantime, Joop started a research
group at the Vrije Universiteit (Free University) in Amsterdam. Over the
years, his group worked on theoretical and applied research on remote sensing
of planetary atmospheres, including the Earth's. More than 60 undergraduate
students did their master research projects, 13 PhD theses were completed,
and an advanced laboratory for accurate measurements of polarized light
scattering by small, irregularly shaped particles was set-up.
The research results obtained by Joop, his students, postdocs and other
collaborators have been documented in numerous papers, such as the
development of the vector adding/doubling technique, the analysis of
fundamental symmetry properties of matrices
transforming the Stokes parameters, and the frequently cited review of
polarized radiative transfer. The culmination of Joop's research is the
monograph on multiple scattering of polarized light in planetary atmospheres. In 1995, Joop organized the first
International Workshop on 'Light Scattering by Non-Spherical Particles' at
the Free University in Amsterdam. This workshop led to a special issue of the
Journal of Quantitative Spectroscopy and Radiative Transfer and triggered a
whole series of conferences, each followed by a special JQSRT issue. Joop,
his close collaborator Michael Mishchenko, and Larry Travis edited a book on
light scattering by non-spherical particles and has served for many years as
an Associate Editor and an Advisory Committee member of JQSRT. Joop's
extensive career included memberships in a various boards and committees as well as in
numerous scientific committees of international symposia, workshops, and
conferences. Joop's retirement in 1999 was marked
with a dedicated workshop at the Astronomical Institute 'Anton Pannekoek' of
the University of Amsterdam to celebrate his work, which also led to a
special issue of JQSRT. Since then Joop
worked as emeritus professor at the 'Anton Pannekoek
Institute where for years he remained actively involved in research, even
venturing into polarized radiative transfer in atmospheres of exoplanets. In
2011, Joop received the first Van de Hulst Light Scattering Award, which was
instated by publisher Elsevier, and for which an international committee of
32 scientists had selected him. Apart from his huge contribution to
science, reactions on his passing mentioned his eye for detail, his
professionalism, his friendliness and trustworthiness, his supportive
attitude and broad interests, not only in science but also in the people
around him. Prof. Hovenier is
survived by his partner and two daughters. Daphne Stam and colleagues ================================================================= AGU Fall Meeting 2023 9-13 December 2024 in Washington, D.C.,
USA. Please consider submitting your abstract
to our session: Advances of Atmospheric Remote Sensing Inversion Session ID: 224310 Session Title: A023: Advances of Remote
Sensing Inversion Section: Atmospheric Sciences View Session Details in the User
Portal: https://agu.confex.com/agu/agu24/gateway.cgi Session Description: - Radiation
measurements from satellites, aircraft and the ground have been successfully
employed for characterizing radiative properties of aerosols, clouds,
atmospheric gases, land, and ocean. One of the challenges is the development
of a reliable procedure for inversion of the observations.
This session is dedicated to unite works
emphasizing the various aspects of numerical inversion that improve
quantitatively and/or qualitatively the retrieved atmospheric products. The
contributions are expected to address such important attributes of inversion
as optimum accounting for errors in the data, inverting multi-source data,
utilizing a priori information, inverse modeling and data assimilation,
retrieval error estimations, and retrieval acceleration. Development of
forward radiative transfer models to improve retrieval is also welcome. We
encourage explorations of new retrieval concept and
improved products such as aerosol types and profiles, surface particulate
matter, trace gas, clouds, and land and ocean properties for existing and
next generation of satellite missions and ground-based networks. Invited speakers: Vanderlei Martins
(University of Maryland Baltimore County, USA) and Vassilis Amiridis (National
Observatory of Athens, Greece) The deadline for all submissions is
Wednesday, 31 July 2024 at 23:59 EDT |
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Awards ---------------------------------------------------------------------------------------------------------------------------------------------------------- We are happy to inform you that a
new "Michael
I. Mishchenko Young Scientist Award in Polarimetric Remote Sensing" has been established. We invite you to nominate your young
colleagues to this
award. The due date for nominations is September 1, 2024 Call for Nominations : https://apolo.loa.univ-lille.fr/2024/07/22/call-for-nominations-2024-michael-i-mischenko-young-scientist-award-in-polarimetric-remote-sensing/ Looking forward for
your outstanding nominations, Oleg Dubovik, on behalf of the APOLO
conveners Committees ------------------------------------------------------------------------------------------------------------------------------------------------------------ The nomination deadline for the
2024 Goody and Waterman Awards
has been extended to September 30, 2024 The deadline for receiving nominations
for 2024
Francois Arago Award has been extended to September 1, 2024 ------------------------------------------------------------------------------------------------------------------------------------------------------ Copernicus Medal The Copernicus Gesellschaft e.V., partner of Copernicus
Meetings & Publications, invites you and your colleagues to suggest
appropriate candidates from the international community of the geo- and space sciences for the
Copernicus Medal. The aim of the Copernicus Medal is threefold: 1) It recognizes ingenious, innovative
work in the geosciences or in the planetary and space sciences; 2) It recognizes exceptional efforts in
community services such as promoting international collaboration, leading
engagement in the organization of international conferences, workshops, or summer schools, and engaging in
public outreach; 3) It is dedicated to colleagues in the midst of their
scientific career (e.g., no later than 20 years after receiving the PhD
degree). Any suggestions will be assessed by an
international and interdisciplinary committee and the award will be presented
at a special commemorative event in April 2025. We kindly ask you to submit your
proposal(s) by 15
November 2024 at the
latest by email to: copernicus.medal@copernicus.org Please provide the following material: 1) A CV (about 1-2 pages) and a list of
up to 10 selected publications or other relevant scientific outcomes (such as
datasets, software, etc.); 2) A concise statement of achievements
(e.g., "for her/his/their pioneering and ground-breaking work on ocean
dynamics and her/his/their excellent leadership in the XYZ Project"); 3) A brief encomium (1-2 pages) of the
candidate and their scientific work, but also an outline of recognizable
community services such as scientific capacity building, promoting international collaboration, leading
engagement in the organization of international conferences, workshops, or
summer schools, and engaging in public outreach. Answers to the following questions shall be clearly articulated
in terms that a non-expert can understand: 3a) What are the new areas of research
they opened up, and
how has this revolutionized the discipline? What are the impacts upon society? 3b) Did the person show leadership and
not just participate in international activities? In which way go these
beyond general serving on committees or convening sessions? 3c) What are the details and the extent
of services to real life people or the training of
young scientists, in particular from outside
their own institution? Thank you very much for your attention. Prof. Dr. Hermann Luehr Prof. Dr. Kristian Schlegel Copernicus Gesellschaft e.V. |
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