VLADIVOSTOK - Russia launched a Soyuz-2.1b rocket Tuesday from the Vostochny Cosmodrome in Russia's Far East to deploy two heliophysics satellites and 53 smaller ones into orbit, Russia's RIA Novosti news agency reported.

The primary payload, two "Ionosphere-M" satellites, are set to monitor Earth's ionosphere to study structural changes, electromagnetic disturbances, atmospheric composition, and ozone distribution in the upper layers, as well as radiation conditions.

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Each weighing 430 kg, the two satellites will operate at an altitude of 820 km, said the report.

They are expected to reach the target orbit 56 minutes and 15 seconds after launch and be joined by the smaller satellites to expand scientific observation.

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Of the 53 small satellites launched for scientific, educational and commercial use, 28 are SITRO-AIS satellites from Russian company Sputniks, designed for maritime identification.

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Also onboard were 16 student-built satellites from the Space-π science and education initiative, and the Kowsar and Hodhod satellites from private Iranian company Space Omid.