<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 14 (filtered medium)"><style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";
mso-fareast-language:EN-US;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:windowtext;}
span.EmailStyle18
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:70.85pt 70.85pt 2.0cm 70.85pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></head><body lang=DE link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=EN-US>Dear Colleagues,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>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. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>A session dedicated to the study of the Hydroxyl airglow layer in the atmospheres of the Earth and other planets (Mars and Venus). <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Presentations which deal with the details of the morphology, temporal variability, photochemistry and the nature of its response to dynamical disturbances are invited. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>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 planets. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><b><span lang=EN-US>The abstract submission deadline is February 18, 2015.</span></b><span lang=EN-US><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>For more information, please see the AOGS 2015 webpage at: <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US><a href="http://www.asiaoceania.org/aogs2015">http://www.asiaoceania.org/aogs2015</a><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Sincerely,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>M. Grygalashvyly and W. Ward<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>---------------------------------------------------------------------------------------<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>AOGS 2015: August 2 - 7, Singapore. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>AS-24: Hydroxyl layer on Earth and other planets<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>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)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>---------------------------------------------------------------------------------------<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:14.0pt'>Hydroxyl layer on Earth and other planets<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:14.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:14.0pt'>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.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:14.0pt'>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. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:14.0pt'>In frame of the session we intend to collect some theoretical, modelling and experimental works on these questions.<o:p></o:p></span></p><p class=MsoNormal>_______________________________________________<o:p></o:p></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p></div></body></html>