  The Atmospheric Drag, Occultation 'N' Ionospheric Scintillation mission
(ADONIS) studies the dynamics of the terrestrial thermosphere and ionosphere in
dependency of solar events over a full solar cycle in Low Earth Orbit (LEO).
The objectives are to investigate satellite drag with in-situ measurements and
the ionospheric electron density profiles with radio occultation and
scintillation measurements. A constellation of two satellites provides the
possibility to gain near real-time data (NRT) about ionospheric conditions over
the Arctic region where current coverage is insufficient. The mission shall
also provide global high-resolution data to improve assimilative ionospheric
models. The low-cost constellation can be launched using a single Vega rocket
and most of the instruments are already space-proven allowing for rapid
development and good reliability. From July 16 to 25, 2013, the Alpbach Summer
School 2013 was organised by the Austrian Research Promotion Agency (FFG), the
European Space Agency (ESA), the International Space Science Institute (ISSI)
and the association of Austrian space industries Austrospace in Alpbach,
Austria. During the workshop, four teams of 15 students each independently
developed four different space mission proposals on the topic of "Space
Weather: Science, Missions and Systems", supported by a team of tutors. The
present work is based on the mission proposal that resulted from one of these
teams' efforts.
