Joint IAGA & ICMA Symposia and ICMA Symposium

JSMA01 Layered phenomena near the mesopause (ICMA and IAGA Division II)

The mesopause region hosts a number of layered phenomena which are caused by the extraordinary conditions at these altitudes. For example, the lowest temperatures in the entire atmosphere are found at the summer mesopause at high latitudes. Layered phenomena include noctilucent clouds (NLC), polar mesosphere clouds (PMC), polar mesosphere summer/winter echoes, and metal layers. This session aims at presenting new experimental and theoretical results explaining the physics and chemistry of these layers, their mutual interaction, and their relationship to the background atmosphere. New measurements from ground based, satellite borne, and in-situ techniques will be shown and compared with current models of these fascinating phenomena. Various temporal and spatial scales will be considered, from micro-physical modeling of ice particle generation to solar cycle variation of NLC/PMC morphology.

Convener: Franz-Josef Luebken, Leibnitz-Institute of Atmospheric Physics, Schloss-Str. 6. 18225 Kuelungsborn, Germany; tel +49-38293-68-0; fax +49-38293-68-50; e-mail:
Co-convener: J.M. Russel III, Hampton University, Virginia, USA

JSMA02 Solar variability effects on the middle atmosphere and troposphere (ICMA and IAGA Divisions II and IV )

The session will focus on observational and theoretical studies of the effects of solar spectral irradiance variability and solar-modulated energetic particle precipitation on chemistry, radiative heating, and dynamics in the mesosphere, stratosphere, and troposphere. Both short-term and long-term (decadal) time scales will be considered. Emphasis will be placed on observations and models that identify and delineate specific physical and chemical processes involved in the atmospheric response to solar variations.

Convener: L. L. Hood, Lunar and Planetary Laboratory, Kuiper Space Sciences Building, University of Arizona, 1629 E. University Blvd., Tucson, Arizona 85721-0092,USA;
tel +1-520-621-6936; fax +1-520-621-4933; e-mail:
Co-convener: U. Langematz, Free University of Berlin, Germany

JSMA03 Short-term variability and long-term changes in the lower and middle atmosphere (ICMA and IAGA Division II)

The measurements of atmospheric constituents from space, airborne and ground based platforms have blossomed in the past two decades and so the atmospheric models. In addition this field is supporting, the development of the chemical weather or numerical environmental forecasting. The main goal of this symposium is to review our current database and knowledge on variability (both natural and human induced) of several atmospheric parameters and related effects on various time scales of hours to decades. In particular, focus would be on climate change and the greenhouse constituents, anthropogenic climate change scenarios, temperature, ozone and pollutants. The natural variations in atmosphere due to seasonal, annual, solar, ENSO, and QBO cycles.

Convener: G. Beig, Indian Institute of Tropical Meteorology, Dr. Homi Bhabha Road, Pashan, Pune-411008, India; tel +91-20-25893600; fax +91-20-25893825; e-mail:
Co-convener: C. Sharma, National Physical Laboratory, India

JSII01 Vertical coupling of the atmosphere-ionosphere system and solar effects on it (IAGA Division II and ICMA)

It is generally accepted now that the Earth's atmosphere as a whole (including the ionosphere embedded in the thermosphere) is a complicated coupling dynamic system. Nevertheless the details of the vertical atmosphere coupling still are a major challenge for the atmospheric physics. The tropospherically forced internal waves (gravity waves, tides and planetary waves) are important in determining both the climatological mean state and the disturbance structure of the middle atmosphere and thermosphere/ionosphere system. The coupling however, depends on the solar and geomagnetic activity as well.

This Symposium will address the recent results obtained concerning the atmospheric coupling (vertical, latitudinal and longitudinal), as more attention will be stressed to the solar-cycle feedback effects on it. The Symposium especially would like to invite investigations related to the downwards control effects transferring from the strongly solar-cycle dependent structure of the thermosphere to the lower atmospheric levels. The results of theoretical modelling and observational investigations of the interaction between small- and large-scale atmospheric phenomena, as waves contribute to the chemical equilibrium and the general circulation through wave leaking, turbulent mixing, etc. are welcome. The character of the ionosphere response to forcing mechanisms originating in the lower atmosphere and the transmission of these effects throughout the thermosphere-ionosphere system is important as well.

The symposium will provide the next opportunity for the international research community to review the progress and suggest some future directions in the investigation of all significant couplings (dynamic and electrodynamic, radiative, transport of atmospheric constituents), trigger mechanisms and feedback processes.

Convener: D.V. Pancheva, Department of Electronic & Electrical Engineering University of Bath, Bath, BA2 7AY, UK; tel. +44 (0)1225 386310; fax +44 (0)1225 386305;
Co-conveners: Ed. Kazimirovsky, Inst. Solar-Terr. Physics, Irkutsk, Russia; L. Hood, University of Arizona, Tucson, USA

JSII02 Long-term trends in the upper atmosphere (IAGA Division II and ICMA)

Increasing concentration of greenhouse gases in the atmosphere, stratospheric ozone depletion, as well as long-term changes of solar and geomagnetic activity can result in long-term changes and trends in the stratosphere, mesosphere, thermosphere and ionosphere. The symposium is focused on the determination of such long-term trends and changes and the quantification of the role of anthropogenic changes (primarily greenhouse effect) versus Sun's effects in the observed trends. Model interpretation and prediction of trends of greenhouse origin is of high importance, as well. Papers dealing with observational determination of long-term trends as well as those dealing with simulations and theoretical studies of trends are welcome.

Convener: J. Lastovicka, Institute of Atmospheric Physics, Acad. Sci. Czech Rep., Bocni II, 14131 Prague 4, Czech Republic; tel +420-267103055; fax +420-272763745; e-mail:
Co-convener: G. Beig, Indian Institute of Tropical Meteorology, Pune, India

ICMA Symposium

MA01 Middle atmosphere science

Papers related to any aspect of the dynamics, chemistry, or physics of the atmosphere from near the tropopause to the lower thermosphere are appropriate for this session. Observational, modelling and theoretical papers are all solicited. Particularly welcome are contributions relating to a number of recent or imminent satellite missions that have the potential to greatly increase our knowledge of the middle atmosphere, including TIMED, ENVISAT, EOS-AURA and COSMIC.

Convener: K. Hamilton, International Pacific Research Center, University of Hawaii, Honolulu, Hawaii 96822, USA; tel +1-808-956-8327; fax +1-808-956-9425; e-mail:
Co-conveners: D. Marsh, National Center for Atmospheric Research, USA; R. Mueller, Inst. Stratosphaersche Chemie, Forschungszentrum Julich GmbH, Germany.


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