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Fig. 4. To the definition of the right ascension of the AP orbits ascending node values
depending on the DTM (date of the Midnight Conjunction with the Tail probe)
and the choice of the most favorable orbits which provide the auroral oval visibility
for two auroral imagers onboard.

To provide the UVAI operation during whole nightside phase it is necesary to select the AP orbits
corresponding to the DTM, belonging to the time inerval within the borders marked by circles.
The AP orbits corresponding to DTM interval within the borders, marked by squares,
provide the operation of UVAI also during the dayside phase.