Measuring small-scale plasma irregularities in the high-latitude E- and F-regions simultaneously.

Area of Science:

• Space Physics
• Atmospheric Science
• Plasma Physics

Background:

• The ionosphere, Earth's ionized upper atmosphere, displays complex turbulent structuring known as plasma irregularities.
• These irregularities are often visualized by auroral displays in polar regions but remain challenging to fully understand.
• Decades of research have focused on plasma irregularities, yet the phenomenon of plasma turbulence persists as elusive.

Purpose of the Study:

• To characterize small-scale plasma irregularities in the ionosphere using combined radar and satellite data.
• To investigate the vertical mapping of information along the ionospheric altitude column.
• To analyze the statistical properties of ionospheric turbulence and its relationship with E-region electrodynamics.

Main Methods:

• Combined scale-dependent measurements from ground-based radar and satellite observations.
• Simultaneous characterization of irregularities in the bottomside and topside ionosphere.
• Statistical analysis of aggregated data over time to identify patterns in plasma turbulence.

Main Results:

• Demonstrated vertical mapping of information down to 1.5 km field-perpendicular wavelengths.
• Characterized the high-latitude ionosphere as a dynamic turbulent system with continuous energy injection and dissipation.
• Linked widespread irregularity dissipation to E-region Pedersen conductance, observing similarities between polar cap and auroral region irregularities.

Conclusions:

• The electrodynamics of a conducting E-region are crucial for understanding high-latitude plasma turbulence.
• E-region conductivity appears to ubiquitously affect turbulent properties, such as the small-scale spectral index.
• A potential association between E-region conductivity and F-region irregularity generation is suggested, warranting further investigation.