Уважаеми колеги, На 18 май 2017 г от 14:00 часа в зала 301 на Института по Електроника на БАН, бул. “Цариградско Шосе” № 72, София ще се проведе редовната сбирка на семинара на Института по Астрономия Carl Schmidt, PhD; Research Associate, Laboratoire Atmosphиres, Milieux, Observations Spatiales (LATMOS), CNRS, France ще представи своята работа на тема "Modern planetary applications for small telescopes" Абстракт: For bright planetary objects, telescopes <1 m can generally offer two simple advantages: time is allocated freely and operational expenses are modest. This talk will give an overview of some current studies of the atmospheres of Mercury, Io and comets using small aperture telescopes. Particular attention is given to the bright sodium component of these atmospheres due to its unique resonant scattering property. Such observations have proved effective in characterizing and disentangling the different processes sustaining Mercury’s thin atmosphere, in which sodium is a primary component. Small near-IR telescopes are an ideal tool to monitor volcanism on Io, and sodium observations provide a valuable proxy for its atmospheric loss processes and interaction with the plasma torus. The relative sodium abundance in cometary comae varies by nearly two orders of magnitude, and is released through a combination of nuclear and dusty grain sources. While the Io observations evidence sodium-bearing molecular ions as a parent species (most likely NaCl+), cometary comae show marked differences between the ion and Na spatial distributions that cannot be attributed to solar radiation pressure or ion pick up.