National Capital Section
of the Optical Society of America
Fifth 2013-2014 meeting of the
National Capital Section of the Optical Society of America
At OSA Headquarters, 2010 Massachusetts Ave. NW
February 11, 2014
"OPTICAL DESIGN OF INSTRUMENTS FOR THE OBSERVATION OF THE SOLAR CORONA"
Dr. Arnaud Thernisien
U.S. Naval Research Laboratory
Regular observations of the solar corona, besides during solar eclipses, became possible thanks to the Lyot coronagraph introduced in 1930. Because the sky background limits the FOV of coronagraphs when used on the ground, these instruments were quickly embarked aboard spacecrafts for improved observing conditions. In order to follow the solar wind perturbations, such as coronal mass ejections, from their origin in the low corona, up to the earth vicinity, heliospheric imagers with wider FOV and pointing offset from Sun center were developed. In this presentation we will briefly review the concepts of the instruments dedicated to the observation of the solar corona. Then we will present the new generation of heliospheric imagers developed for the Solar Orbiter and Solar Probe Plus missions. We will discuss the design challenges, especially the optimization of the stray-light performances, and how we validate the numerical models with laboratory testings..
Dr. Arnaud Thernisien received an Engineering degree in applied physics from the Ecole Nationale Supérieure de Physique de Marseille (now Centrale Marseille) in 1999. He received his PhD in Optics and Image Processing at the Université Paul Cézanne of Marseille in 2008. In the solar physics team of the Laboratoire d'Astrophysique de Marseille we worked on the in-flight calibration of the LASCO coronagraphs, which is aboard the ESA/NASA SOHO mission. He then worked as a contractor at the Naval Research Laboratory (NRL) in Washington DC, where he developed tools to analyze the 3D morphology of coronal mass ejections (CMEs) observed with the SECCHI instruments of the NASA STEREO mission. He now works at NRL as an optical engineer on the design of two future space telescopes for the observation of the solar corona: SoloHI, aboard the ESA/NASA Solar Orbiter mission, and WISPR, aboard the NASA Solar Probe Plus mission.
OSA Headquarters, 2010 Massachusetts Ave, NW, near Dupont Circle.
The OSA Headquarters are located at 2010 Massachusetts Ave., NW, Washington DC, just west of Dupont Circle. There will be parking in the OSA building garage that can be entered from P Street. Someone will be watching the remote monitors to let people in, either through the garage (if in your car), or the front door (Mass. Ave. side) if you are on foot. If the garage does not open reasonably promptly, press the buzzer. It is very important that you DO NOT pick up the telephone by the front and back entrances. This phone goes directly to security which in turn calls several OSA staff members at their homes! Park only in spaces marked "Reserved for OSA". If you have any difficulties entering the building, please contact the OSA Local Section liaison John Taylor at (202) 416-1432. Please try to carpool as much as possible, or take the Metro, since parking is limited. The lecture will be in the P St. conference room on the first floor.
Note that the Dupont Circle Metro station (Red Line) is only a couple of blocks away.
6:00 PM - Please try to arrive by then to facilitate garage entry. Carpooling is essential, due to the limited number of parking spaces.
6:00 PM - 6:30 PM - Arrival and Social Gathering
6:30 PM - Lecture at OSA headquarters "Optical Design of Instruments for the Observation of the Solar Corona", by Dr. Arnaud Thernisien, Naval Research Laboratory.
7:45 PM - Optional Dinner at a local restaurant.
For more Information CONTACT:
John Burris (301) 614-6031 or firstname.lastname@example.org
OUR NEXT MEETING -- The March Meeting will be a Saturday session at the biannual conference at the Washington Academy of Sciences. The conference will be held on March 29-30 in the Ballston district of Arlington. Please save the dates.
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