Plasma Propulsion System Uses Thin Upper‑Atmosphere Gas 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 for satellites to remain functional in very low Earth orbit without carrying onboard fuel reserves.

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

The innovative concept avoids this penalty by ionising the minute quantities of oxygen and nitrogen that remain at those heights. An electric field then accelerates the generated plasma, delivering thrust that opposes drag. Since the system draws the surrounding gas instead of depending on a limited onboard tank, a satellite could, in principle, sustain its altitude throughout its mission.

The researchers who outlined the idea point out that the power requirement fits within 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 volume 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 forthcoming step is an in‑orbit demonstration. If validated, this technology could transform mission planning in the lowest orbital tier, lengthening satellite lifespans, cutting debris risk, and unlocking fresh opportunities for high‑resolution Earth imaging and low‑latency communications.