Space Weather Euro News Vol. 11 Issue 3 (29-03-07)

Table of Contents:

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  1. Pierre Lantos
  2. Some ESA Tender Actions from ESA-EMITS
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SWEN Newsletters at: http://esa-spaceweather.net/spweather/SWEN/swen.html
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1. Pierre Lantos
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From: Monique Pick

Pierre Lantos passed away on Thursday March 1st, at the age of 64. He was Directeur de Recherches au Centre National de la Recherche Scientifique and has been working at the Paris Observatory since 1965.

A large part of his research activities has been devoted to the understanding, through radio observations in a large frequency domain, of the structure of the solar corona and of coronal related phenomena. Among his many contributions let us mention in particular:

-His study of the gyroresonance microwave emission from active regions. This emission is due to the gyromotion of thermal electrons in the presence of a magnetic field and he discussed, in 1968, the possibility of using the cm-? polarization maps as magnetograms of the transition region and of the corona. He later (1980) compared, with C. Alissandrakis nd M. Kundu, the model calculations with various observations, such as those obtained with the Westerbork Synthesis Radio Interferometer. Also, as early as 1972, Pierre Lantos presented at a CESRA meeting arguments for a high resolution microwave radioheliograph, a preconcept of the FASR project.

-The development of a model of the interspicular chromosphere- corona transition region. This model was derived from the combination of radio microwave measurements and of hydrodynamic conservation equations and was thus more consistent than the previous, empirical, ones. The results of this study represented the central part of his PhD dissertation (1971).

-His work on the radio emission of large-scale structures, including coronal holes, streamers, the background quiet sun, and the coronal root of the heliospheric plasma sheet. He made, with C. Alissandrakis, the first detection of the density structure on the disk of this plasma sheet. Pierre always emphasized the importance of such studies for the understanding of the relationship between coronal structures and the solar wind regime, and underlined how these studies could apply to the understanding of solar terrestrial physics during quiescent periods. A good review of the subject appeared in the Nobeyama symposium 1998, NRO report 479.

With the help of the data from the Solar Maximum Mission in 1980, P. Lantos carried out several studies on the coronal transient events and on their role in the electron acceleration. These studies were based on joint multi wavelength observations, including X-ray, white light and radio observations. One of his best known papers, cited more than 50 times, is the existence of a temporal relationship between an X-ray long-duration event (LDE) and an intense radio continuum, in spite of the considerable spatial separation between the emitting sources. The link between these two sources was provided by the CME white light loops.

Since the beginning of his carrier, Pierre Lantos has been associated with the Nanšay radio astronomy station and, during many years, made observations with various instruments of this station. After 1971, he collaborated significantly to the development of the Nanšay Radioheliograph.

In 1986, Pierre Lantos became responsible for the Western Europe Warning Center of ISES. With the help of a forecasting team and the support of the CNES (French Center for Space Studies) the center provided daily high level forecasts of the solar activity for many years (geomagnetic index, 10.7 cm flux, flares...), before the center operation was transferred in 2000 to the SIDC (Solar Influence Data Center) in Brussels and to the CLS (Collecte Localisation Satellite) in Toulouse. Simultaneously, Pierre carried out researches on the solar cycle prediction, particularly through the study of its precursors. As soon as 1996, with the IRSN (French Institute for Radiation Protection and Nuclear Safety) and the DGAC (French Directorate of Civil Aviation), he got involved in the SIEVERT project, in which he performed pioneering work. Using the French neutron monitors data of the Kerguelen Island and of Terre Adelie, he managed to set up a unique space weather application dedicated to the monitoring of doses received on board by airplanes; this technique is now operational for more than 6 years (www.system-sievert.org).

Besides his scientific activity Pierre Lantos played an important role in the public understanding of solar astronomy. His frequent interviews and conferences reached a large audience, and he was author of two successful books "Le Soleil"(Que sais je, PUF, 1994) and "Le Soleil en face" (Mason, 1997).

Science was not his unique centre of interest; literature, ethnology, and music were for him much more than hobbies. Yet, he placed moral and human values above anything else: he was always kind to any one, students, and colleagues. He forced admiration of every one by his courage and self-control during his last disease. The community will miss a scientist, and a marvelous colleague and friend.

Monique Pick and Nicolas Fuller

LESIA, Observatoire de Paris.

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2. Some ESA Tender Actions from ESA-EMITS
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AO5359 SMALL GEO MISSION PHASE 0+A
(From 19/02/2007 to 30/04/2007, Act.Ref.: 07.153.37)
AO5178ACCESS AND UTILISATION OF A CONSTELLATION OF SMALL SATELLITES FOR EARTH OBSERVATION AND SECURITY APPLICATIONS
(From 09/02/2007 to 24/04/2007, Act.Ref.: 05.197.13)
AO5383GSTP 4 ANNOUNCEMENT OF OPPORTUNITIES 2007
(From 09/03/2007 to 12/04/2007, Act.Ref.: 07.136.01)
AO5387ESA INTERACTION WITH EUROPEAN UNIVERSITIES ON ADVANCED RESEARCH TOPICS - THIRD CALL
(From 06/03/2007 to 17/04/2007, Act.Ref.: 07.197.56)
AO5356EARTHCARE SATELLITE PHASES B, C/D AND E1
(From 07/02/2007 to 17/04/2007, Act.Ref.: 06.156.03)
AO4780ARTES 4 - ESA-INDUSTRY PARTNERSHIP PROGRAMME: CALL FOR PROPOSALS
(From 24/11/2004 to 31/12/2007, Act.Ref.: 04.153.85)

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For a complete list of ESA Tender Actions, see:
http://emits.esa.int
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Note: This newsletter is an initiative of the ESA Space Environments
and Effects Analysis Section ( http://space-env.esa.int) and is a prototype
mailing list intended to provide a forum for information posting news of
interest to the Space Weather community in Europe.

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