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25-year de-orbit criterion(3)
altitude(3)
altitude profile(3)
altitude range(3)
available orbit inclination(3)
critical limitation(3)
crucial information(3)
few location(3)
flight operation(3)
geomagnetic activity(3)
high inclination orbit(3)
high-sensitivity line-of-sight observation(3)
hydrogen ion(3)
ion gradient structure(3)
ion-neutral studies(3)
ionosphere(3)
ionospheric physics(3)
ionospheric variability(3)
ionospheric-thermospheric scanning photometer(3)
it-spins(3)
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