CEDAR email: AOGS-2015, AS24, Hydroxyl layer

Mykhaylo Grygalashvyly gryga at iap-kborn.de
Thu Feb 12 07:09:54 MST 2015

Dear Colleagues,


We would like to call your attention to session AS-24 at the Asia Oceania
Geosciences Society (AOGS 2015) conference on recent advances in studies of
the excited hydroxyl layer, to be held from August 2 - 7, 2015 in Singapore.


A session dedicated to the study of the Hydroxyl airglow layer in the
atmospheres of the Earth and other planets (Mars and Venus). 


Presentations which deal with the details of the morphology, temporal
variability, photochemistry and the nature of its response to dynamical
disturbances are invited. 


This includes presentations on ground and satellite observations, model
simulations, as well as new observation techniques and theoretical research
that can help advance our knowledge of the excited hydroxyl layer
parameters, formation and relaxation on Earth, Mars and Venus. This session
is intended to support discussion and collaboration on the understanding of
this airglow emission and possible differences in its formation on different


The abstract submission deadline is February 18, 2015.


For more information, please see the AOGS 2015 webpage at: 





M. Grygalashvyly and W. Ward



AOGS 2015: August 2 - 7, Singapore.   


AS-24:  Hydroxyl layer on Earth and other planets


Conveners: Michael Grygalashvyly (Leibniz-Institute of Atmospheric Physics
(IAP), Germany), William Ward (University of New Brunswick, Canada), Orhan
SEN (Istanbul Technical University (ITU) Faculty of Aeronautics and
Astronautics, Turkey)



Hydroxyl layer on Earth and other planets


The airglow measurements in the Meinel band of excited hydroxyl is a tool
extensively used to infer temperatures at mesopause height and information
about dynamical processes, such as gravity waves, planetary waves, and
tides. Moreover, the observation of emission from OH* Meinel bands is used
to determine atomic oxygen, ozone, and atomic hydrogen which are very
difficult to measure by other methods, and, in perspective, can be used to
retrieve the chemical heating rate from the most significant exothermic
reaction in the mesopause. A number of investigations are focused on
temperature trends obtained from measurements of the relative intensities of
two lines in one of the vibrational-rotational bands.  Recently, OH* Meinel
band emissions were detected on Mars and Venus that give rise new interest
to OH*- layers.

In spite of large application, less attention was devoted to parameters of
the layer such as thickness, altitude, and number density. Concerning the
OH*-layer and its behavior a number of questions arise. How does the
altitude of OH* change? How does the intensity (number density) of OH*
change? Which variations in temperature corresponds to OH* variations? How
does the variation in OH* depend on the Lyman-alpha variation? How much of
the variation is dependent on chemistry, dynamics and the Lyman-alpha,
respectively? How does the OH* variation depend on the vibrational number?
What is the relative behavior for OH* with different vibrational numbers?
What is the dependence between the height and intensity of the emission
(number density) of the layer? These questions can be asked about the
variation of height, number density, thickness, and corresponding
temperature in the framework of seasonal-latitudinal, short-term, and
long-term variability. The questions on formation-relaxation processes of
OH* are represent an additional field related to hydroxyl layer. 

In frame of the session we intend to collect some theoretical, modelling and
experimental works on these questions.



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