Signals in Parker Solar Probe data point to high-speed charged dust surviving much closer to the Sun than models had assumed, giving researchers a new possible mechanism for heating the solar corona.
Voltage spikes in the probe’s FIELDS antennas served as an improvised dust detector: grain impacts vaporized particles and created charged clouds that revealed their presence despite the spacecraft lacking a dedicated dust instrument.
Charged dust could alter Alfvén kinetic waves in two opposing ways—grain mass may slow waves and carry energy farther, while grain charge may intensify local wave-particle heating.
The idea matters because the corona reaches about 1 million to 3 million°C while the Sun’s visible surface is near 5,500°C, a long-standing mismatch that standard plasma-and-magnetic-field models have not fully explained.
The Astrophysical Journal study stops short of proof, and researchers say future missions with dedicated dust and plasma-wave instruments will be needed to confirm whether the grains are merely surviving or actively shaping coronal heating.
How will this newly discovered dust storm around the Sun impact future missions and spacecraft technology?
Is common space dust the secret ingredient that superheats the Sun’s atmosphere to millions of degrees?
Charged Dust Grains Identified as Major Contributors to Coronal Heating by Parker Solar Probe (2026)
Overview
In July 2026, the Parker Solar Probe made a groundbreaking discovery by revealing that tiny charged dust grains play an active and significant role in heating the Sun’s corona, challenging long-held beliefs in solar physics. These dust grains are not just passive particles; they interact dynamically with the Sun’s plasma, electric, and magnetic fields, and their high-energy impacts inject energy into the corona. By detecting hundreds of such impacts, the probe showed that dust grains help drive both coronal heating and solar wind acceleration, offering a fresh perspective on why the Sun’s outer atmosphere is so much hotter than its surface.