Café Scientifique | July 24
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571 Galapago St, Denver, CO 80204 |
Aurorae
Join us for an engaging Café Scientifique with Vincent Dols, from the Laboratory for Atmospheric
and Space Physics
in Boulder, Colorado.
In partnership with SCFD, Scientific & Cultural Facilities District, and la
French Tech Denver.
FR: Les aurores polaires sont des émissions lumineuses naturelles produites haut dans le ciel nocturne des régions polaires. Elles apparaissent souvent comme de longs rideaux étroits de couleur verte, mauve et rouge, parfois très dynamiques. Elles sont produites lorsqu’une perturbation du vent solaire (des particules chargées électriquement qui proviennent de la couronne solaire) interagit avec le bouclier magnétique terrestre (la magnétosphère). Des électrons très énergétiques sont alors projetés vers les régions polaires, percutent et excitent les atomes et molécules de la haute atmosphère, produisant les aurores. Illustration avec quelques animations des procédés qui produisent les aurores terrestres et discussion rapide des mêmes phénomènes observés à Jupiter.
EN: Polar aurorae are natural luminous emissions produces high in the night sky in polar regions. They often appear as long narrow and sometimes very dynamic ribbons in green, mauve and red. Aurorae are produced when the solar wind ( electrically charged particles from the solar corona) interacts with the earth’s magnetic field (the magnetosphere). As a result, energized electrons are projected towards the polar regions, exciting the atoms and molecules in the upper atmosphere and producing aurorae. This mechanism will be illustrated by animation, followed by a brief discussion of the same phenomenon on Jupiter.
Free and open to all curious minds — come with questions!
PRESENTATION IN FRENCH AND ENGLISH
SLIDESHOW IN ENGLISH
Vincent Dols
Laboratory for Atmospheric and Space Physics
Vincent Dols has a physics degree from the University of Liege where he studied the first ultraviolet photos of polar aurorae observed on Jupiter with the Hubble Space Telescope. After an MS in spatial physics at the University of Fairbanks in Alaska and a doctorate at the University of Liege, Vincent has been working at the University of Colorado/Boulder on the computer modeling of the interaction of electron and ion interactions in Jupiter’s magnetosphere with the atmosphere of Jupiter’s moons Io and Europa.
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