Defining the Middle Corona

Area of Science:

• Solar Physics
• Heliophysics
• Plasma Physics

Background:

• The middle corona (1.5-6 solar radii) is vital for solar outflow and heliospheric connections.
• This region shapes solar wind, eruptions, and modulates inner coronal dynamics.
• Historically, observational challenges have limited studies of the middle corona.

Purpose of the Study:

• To define the middle corona's location, extent, and composition.
• To identify key physical transitions and processes within this region.
• To provide an overview of the physics governing the middle corona.

Main Methods:

• Review of existing solar remote-sensing and in-situ data.
• Analysis of recent advances in instrumentation and observational techniques.
• Synthesis of current understanding of middle coronal physics.

Main Results:

• The middle corona is defined as the region between 1.5 and 6 solar radii.
• It encompasses critical physical transitions influencing solar outflow.
• Increased interest and improved observational capabilities are enhancing studies.

Conclusions:

• The middle corona is essential for connecting the inner corona to the heliosphere.
• A comprehensive understanding requires defining its characteristics and governing physics.
• Further research is needed to fully unravel the complexities of this region.