Balloon-borne solar observatory maps detailed magnetic field patterns in the sun's upper atmosphere

The Sunrise-III stratospheric observatory has detected unexpectedly complex, thread-like magnetic structures within the solar chromosphere above quiet regions of the sun during observations in 2024. Rather than the simple, uniform structures previously expected, the magnetic canopy contains numerous thin, elongated substructures created by twisted magnetic field lines influenced by surface motions. These observations provide new insights into the organization and behavior of solar magnetic fields and their interaction with atmospheric features such as spicules.

The Sunrise-III mission operates at an altitude where Earth's atmospheric interference is minimal, enabling scientists to study faint magnetic signals that ground-based observatories cannot reliably detect. The instrument SCIP measures magnetic properties across multiple atmospheric layers of the sun simultaneously, allowing researchers to build a three-dimensional understanding of how these fields behave. Computer simulations have confirmed that the delicate thread-like patterns observed are generated when surface-level solar motions twist magnetic field lines, a mechanism previously difficult to visualize with such clarity.

Quiet regions comprise the majority of the solar surface and have long been understudied compared to dramatic active zones like sunspots. Understanding the magnetic organization in these areas is fundamental to solar physics, as the mechanisms governing energy flow from the sun's interior to its upper atmosphere remain incompletely understood. These baseline observations of quiet-sun magnetism provide essential reference data for the field.