Ionosfera is a constellation of four ionospheric and magnetospheric research satellites developed by for Roscosmos for the project Ionozond.

The satellites will operate on circular sun-synchronous orbits (SSO), at altitude of about 800 km and located in two orbital planes of two satellites each.

The following science instruments are carried on the satellites:

* SPER/1 Plasma and energy radiation spectrometer
* SG/1 Gamma-ray spectrometer
* GALS/1 Galactic cosmic ray spectrometer / 1
* LAERTES On-board Ionosonde
* NBK/2 Low-frequency wave complex
* ESEP Ionospheric plasma energy spectrometer
* Ozonometer-TM Ozonometer
* MayaK On-board radio transmitters
* PES GPS-GLONASS device

53 small satellites developed by various institutions and companies in Russia and other nations (including 2 from Iran) for technology demonstration, communication and Earth observation purposes.