A study published on July 1, 2026, by researchers at The University of Alabama in Huntsville (UAH) reveals that tiny charged dust grains near the sun could significantly influence energy transfer in the solar corona. This discovery may change our understanding of why the corona is millions of degrees hotter than the sun's surface.
Understanding Solar Corona Heating
The solar corona, the sun's outer atmosphere, reaches temperatures between 1–3 million°C, far exceeding the surface temperature of about 5,500°C. For decades, scientists have sought to explain this temperature discrepancy, focusing on electrons, ions, and magnetic fields. However, this new study suggests that dust grains may play a crucial role.
Lead author Syed Ayaz, a graduate research assistant at UAH's Center for Space Plasma and Aeronomic Research (CSPAR), stated, "The discovery of dust in the young solar wind by Parker Solar Probe allowed Syed to open up an entirely new and unexpected area of study in solar physics." This study was conducted using data from NASA's Parker Solar Probe (PSP), the first mission to explore the solar corona.
The Role of Dust in Plasma Waves
The study highlights that dust, previously thought to be irrelevant near the sun, alters the behavior of plasma waves that transport energy in space. By affecting how these waves move and dissipate energy, dust might dictate where and how solar heating occurs in the corona and the young solar wind.
Dr. Gary Zank, a distinguished professor of space science at UAH, emphasized the significance of this finding, stating, "Syed has done outstanding work that will have a significant impact on understanding of the physics of the solar corona." The introduction of dust into existing models could reshape our understanding of solar corona heating.
New Insights from the Parker Solar Probe
The Parker Solar Probe's FIELDS instrument suite measures electric and magnetic fields, plasma waves, and radio emissions in the solar corona. Surprisingly, the PSP data revealed that dust is still present and active much closer to the sun than previously assumed.
When dust grains collide with the spacecraft, they vaporize, creating charged particles detected by the FIELDS antennas. Ayaz noted, "What surprised me most was that the PSP could reveal so much about dust, even though it does not carry a dedicated dust detector on board." This unexpected finding opens new avenues for research in solar physics.
- Key Findings:
- Dust grains may influence energy transfer in the solar corona.
- The corona's temperature mystery may be explained by dust interactions.
- New models incorporating dust could change solar physics understanding.
Ayaz's study shows that dust affects kinetic Alfvén waves—key energy carriers in space plasmas—by adding inertia or enhancing interactions with electric fields. This dual role of dust could determine how solar energy is deposited in the corona.
🤖 This article was rewritten by Feed and Figures' editorial AI from a report originally published by Phys.org. Facts and quotes are preserved from the original; the rewrite focuses on clarity and structure. For the unedited original, see the source link below.
