Plasma Propulsion System Uses Thin Upper‑Atmosphere to Sustain Satellites in Ultra‑Low Orbit

A novel plasma thruster that extracts its propellant straight from the thin gases of the upper atmosphere offers the ability to keep satellites functional in very low Earth orbit without carrying onboard fuel reserves.

Situated roughly 100 to 450 km above Earth, very low Earth orbit (VLEO) provides clear benefits: imaging instruments attain higher resolution, and communication or radar payloads need less power to transmit to the surface. The downside has traditionally been the increased atmospheric drag that rapidly drains orbital energy, compelling operators to stock additional fuel for regular re‑boosts.

This innovative design avoids the penalty by ionizing the minute quantities of oxygen and nitrogen that remain at those heights. An electric field then accelerates the generated plasma, yielding thrust that offsets drag. Since the system draws on surrounding gas instead of a limited tank, a satellite could, in principle, sustain its altitude throughout its mission.

The scientists behind the concept point out that the power requirement matches the modest electrical budgets of small satellites, and that the absence of consumables may reduce launch mass and expense. Removing the necessity for dedicated propellant tanks and related plumbing frees up space for extra payload or more compact form‑factors, an advantage particularly appealing to extensive constellations aiming to maximise coverage.

Although lab experiments have shown that the engine can produce measurable thrust under simulated VLEO conditions, the upcoming step is an in‑orbit demonstration. If validated, this could transform mission planning for the lowest orbital tier, lengthening satellite lifespans, lowering debris risk, and unlocking fresh opportunities for high‑resolution Earth observation and low‑latency communications.