Comet Calendar, The Official Event Calendar for UT Dallas en-us This week's events for Natural Sciences & Mathematics at UT Dallas Physics Colloquium: The Chronicles of Lower-Upper Atmosphere Cooling --- from Milliseconds to Decades Wednesday, Oct 14
(4 p.m. - 5:15 p.m.)

Dr. Jia Yue (Hampton University)

The impact of solar and geomagnetic activity on the thermosphere and ionosphere (T- I) system has been the focus area of upper atmospheric research since the discovery of the ionosphere. The penetration of lower atmospheric waves (gravity waves, tides, planetary waves, etc.) into the upper atmosphere and the resultant impacts on the T-I system, on the other hand, have only recently drawn great attention from the upper atmospheric research community. There is a growing awareness that the lower-upper atmosphere dynamical and electromagnetic coupling processes can have significant effect on the accuracy of space weather forecasts. In this talk, I will review several coupling processes spanning from milliseconds to decades. The shortest process is so called "Transient Luminous Events" caused by lightning discharges, the finding of the "tiger elve". The same parent thunderstorms can also excite atmospheric gravity waves with periods of minutes that travel through the stratosphere, mesosphere, thermosphere and drive Traveling Ionospheric Disturbances. In a period of multiple days, the traveling planetary waves, such as the Quasi-Two-Day Wave, can substantially impact the thermosphere and ionosphere. At last, anthropogenic carbon dioxide diffused to the upper atmosphere cools the thermosphere and causes contraction over decades to the future.

Actuarial Program Event: AON Hewitt Presentation Friday, Oct 16
(12 p.m. - 1:15 p.m.) Location: SSB 3.107 (Career Center Seminar Room).

Actuarial consulting firm, AON Hewitt Presentation: Friday, October 16, 2015,

12:00 pm - 1:15 pm, SSB 3.107 (Career Center Seminar Room)

Geosciences Seminar Friday, Oct 16
(3:30 p.m. - 4:30 p.m.)

The Department of Geosciences is pleased to announce the upcoming seminar and invite you to join us on Friday, October 16, 2015 at 3:30 p.m. in ROC 2.103.  Our distinguished guest speaker will be Dr. Margarete Jadamec from the University of Houston.  The title of her presentation will be "Flab Slab Subduction, the Denali Fault, and Mountain Building in the Central Alaska Range.

Admission is free and refreshments will be served after the seminar.  We hope you will plan to join us.