Preliminar observational program.
Observed Region and Observing Plan
EUI (expecially the HRIs) will
provide us informations about the plasma dynamics with a high spatial and
temporal resolution from the chromosphere up to the corona.
It will be possible to trace global events (such as EIT and MORETON waves) at
different altitudes on the solar atmosphere but also follow the evolution of
emerging and/or erupting structures (such as filaments, prominences, CME).
Impact of the orbit on EUI performances
Illustration of the FSI FoV variations. The red box gives the size of the HRIs FoV.
To resume some of the effects of the orbit, the distance to the Sun varies continuously with a
factor 3.9, during the nominal mission phase (after Sept. 2018); the inclination with respect
to the ecliptic evolves; the spacecraft is in quasi corotation for brief
periods, representing windows for special observational programs (compared to
standard programs). Additionally,
the level of co-rotation decreases when the mission extends in its higher latitude phase. The fact that
the S/C-Sun-Earth angle is different at each orbit has several scientific implications.
Movie [25Mb] showing the variation of the FoV of FSI throughout the mission timeline.
The movie to the right (click on the image) shows the Sun observed with the FSI instrument during the lifetime of the Solar Orbiter mission. It is a realistic illustration of what the instrument will see, in the sense that the estimated orbit is used to compute the angle and distance under which the Sun will be seen from the probe. more ...
To the upper right, the
positions of the Sun (yellow), Earth (blue), Venus (orange),
Solar Orbiter (white) and Sentinel (light blue) spacecrafts are shown. The square box delineates a subfield of 2048×2048px
within the 4k×4k detector used for FSI. To save telemetry and keep sufficient spatial resolution, only
this subfield will be downloaded to the ground during most of the mission, except near the perihelion, when the full
picture will be collected.