<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=Windows-1252">
<style type="text/css" style="display:none;"> P {margin-top:0;margin-bottom:0;} </style>
</head>
<body dir="ltr">
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<p class="MsoNormal" style="margin: 0in; font-size: 12pt; font-family: Calibri, Arial, Helvetica, sans-serif; text-align: justify; color: rgb(0, 0, 0);">
<span style="font-size:12.0pt;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:Calibri;color:#212121;background:white"></span></p>
<p class="MsoNormal" style="margin:0in 0in 8pt;font-size:11pt;margin-bottom:0in;mso-layout-grid-align:none;text-autospace:none">
<span style="font-size:12.0pt;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:Calibri;color:#212121;background:white">Dear Colleagues,<o:p> </o:p></span></p>
<p class="MsoNormal" style="margin:0in 0in 8pt;font-size:11pt;margin-bottom:0in;mso-layout-grid-align:none;text-autospace:none">
<span style="font-size:12.0pt;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:Calibri;color:#212121;background:white"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin:0in 0in 8pt;line-height:107%;font-size:11pt;margin-right:2.25pt">
<span style="font-size:12.0pt;mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin;color:#212121;background:white">As a guest editor of the special issue, “Atmospheric Airglow – Recent Advances in Observations, Experimentations, and Modeling” in the
open-access journal of Atmosphere, I’m pleased to share that the special issue is now completed.<span style="mso-spacerun:yes">
</span><o:p><br>
</o:p></span></p>
<p class="MsoNormal" style="margin:0in 0in 8pt;line-height:107%;font-size:11pt;margin-right:2.25pt">
<span style="font-size:12.0pt;mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin;color:#212121;background:white"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin:0in 0in 8pt;line-height:107%;font-size:11pt;margin-right:2.25pt">
<span style="font-size:12.0pt;mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin;color:#212121;background:white">This special issue has a collection of 11 papers by the following lead authors:
</span><span style="font-size:12.0pt;mso-fareast-font-family:"Times New Roman";mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin">Thomas J. Immel</span><span style="font-size:12.0pt;mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin;color:black;mso-color-alt:windowtext;background:white">,<span style="mso-spacerun:yes">
</span><span class="sciprofiles-linkname">Gabriel Augusto Giongo</span></span><span style="font-size:12.0pt;mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin">,
</span><span style="font-size:12.0pt;mso-fareast-font-family:"Times New Roman";mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin">Carlos Martinis, Valentine Yankovsky, Fabio Vargas, Jia Yue,
</span><span class="sciprofiles-linkname"><span style="font-size:12.0pt;mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin;color:black;mso-color-alt:windowtext;background:white">Christoph Franzen</span></span><span style="font-size:12.0pt;mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin">,
</span><span style="font-size:12.0pt;mso-fareast-font-family:"Times New Roman";mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin">Murdock Hart<span style="color:#222222">, and Tai-Yin Huang.<span style="mso-spacerun:yes">
</span><o:p><br>
</o:p></span></span></p>
<p class="MsoNormal" style="margin:0in 0in 8pt;line-height:107%;font-size:11pt;margin-right:2.25pt">
<span style="font-size:12.0pt;mso-fareast-font-family:"Times New Roman";mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin"><span style="color:#222222"><o:p><br>
</o:p></span></span></p>
<p class="MsoNormal" style="margin:0in 0in 8pt;line-height:107%;font-size:11pt;margin-right:2.25pt">
<span style="font-size:12.0pt;mso-fareast-font-family:"Times New Roman";mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin;color:#222222">I invite you to check out the special issue
</span><a href="https://www.mdpi.com/2073-4433/12/2/202"><span style="font-size:12.0pt;mso-fareast-font-family:"Times New Roman";mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin">editorial</span></a><span style="font-size:12.0pt;mso-fareast-font-family:"Times New Roman";mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin;color:#222222">
to get a glimpse of the topics. The papers can be accessed here, </span><a href="https://www.mdpi.com/journal/atmosphere/special_issues/atmospheric_airglow"><span style="font-size:12.0pt;mso-fareast-font-family:"Times New Roman";mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin">Special
Issue on Airglow</span></a><span style="font-size:12.0pt;mso-fareast-font-family:"Times New Roman";mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin;color:#222222">.<span style="mso-spacerun:yes">
</span><span style="mso-spacerun:yes"> </span><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin:0in 0in 8pt;font-size:11pt;margin-bottom:0in;mso-layout-grid-align:none;text-autospace:none">
<span style="font-size:12.0pt;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:Calibri;color:#212121;background:white"><br>
</span></p>
<p class="MsoNormal" style="margin:0in 0in 8pt;font-size:11pt;margin-bottom:0in;mso-layout-grid-align:none;text-autospace:none">
<span style="font-size:12.0pt;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:Calibri;color:#212121;background:white">Best,<o:p> </o:p></span></p>
<p class="MsoNormal" style="margin:0in 0in 8pt;font-size:11pt;margin-bottom:0in;mso-layout-grid-align:none;text-autospace:none">
<span style="font-size:12.0pt;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:Calibri;color:#212121;background:white"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin:0in 0in 8pt;font-size:11pt;margin-bottom:0in;mso-layout-grid-align:none;text-autospace:none">
<span style="font-size:12.0pt;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:Calibri;color:#212121;background:white">Tai-Yin Huang<o:p> </o:p></span></p>
<p class="MsoNormal" style="margin:0in 0in 8pt;font-size:11pt;margin-bottom:0in;mso-layout-grid-align:none;text-autospace:none">
<span style="font-size:12.0pt;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:Calibri;color:#212121;background:white">Guest Editor
</span><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin:0in 0in 8pt;font-size:11pt;font-family:"Calibri", sans-serif;margin-bottom:0in;mso-layout-grid-align:none;text-autospace:none">
<span style="font-size:12.0pt;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:Calibri;color:#212121;background:white"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin:0in 0in 8pt;font-size:11pt;font-family:"Calibri", sans-serif;margin-bottom:0in;mso-layout-grid-align:none;text-autospace:none">
<span style="font-size:12.0pt;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:Calibri;color:#212121;background:white"><br>
</span><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p></o:p></span></p>
</div>
<div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div id="Signature">
<div>
<div></div>
<div id="divtagdefaultwrapper" dir="ltr" style="font-size:12pt; color:#000000; font-family:Calibri,Helvetica,sans-serif">
<p style="margin-top:0px; margin-bottom:0px; margin-top:0; margin-bottom:0">Dr. Tai-Yin Huang, Professor of Physics</p>
<p style="margin-top:0px; margin-bottom:0px; margin-top:0; margin-bottom:0">Penn State Lehigh Valley</p>
<p style="margin-top:0px; margin-bottom:0px; margin-top:0; margin-bottom:0">IDEA,<a class="OWAAutoLink" href="http://sites.psu.edu/idea"> http://sites.psu.edu/idea</a></p>
<p style="margin-top:0px; margin-bottom:0px; margin-top:0; margin-bottom:0">IESE,<a class="OWAAutoLink" href="http://sites.psu.edu/iesepslv">http://sites.psu.edu/iesepslv</a></p>
Member of Penn State Presidential Commission for Women</div>
<div dir="ltr" style="font-size:12pt; color:#000000; font-family:Calibri,Helvetica,sans-serif">
<span>Distinguished Fellow, Institute of Data Science and Artificial Intelligence</span><br>
<p style="margin-top:0px; margin-bottom:0px"></p>
</div>
</div>
</div>
</div>
</body>
</html>