Sources of solar energetic particles.

Area of Science:

• * Space Physics
• * Solar Physics
• * Plasma Physics

Background:

• * Solar energetic particles are crucial to space weather.
• * Traditional models of solar flares and CMEs have remained static for decades.
• * Existing acceleration mechanisms for solar flares and CMEs are part of a long-standing, unchanged model.

Purpose of the Study:

• * To review and revise the established understanding of particle acceleration in solar flares and CMEs.
• * To present new evidence supporting a unified acceleration mechanism for explosive solar phenomena.
• * To challenge the conventional "cartoon" model of solar eruptions.

Main Methods:

• * Review of existing literature and theoretical models.
• * Analysis of recent global magnetohydrodynamic (MHD) simulations.
• * Examination of evidence for current sheet formation and fragmentation during solar eruptions.

Main Results:

• * Explosive solar phenomena spontaneously generate current sheets within erupting magnetic structures.
• * The evolution and fragmentation of current sheets drive strong turbulence and turbulent reconnection.
• * Turbulent shocks are also a consequence of these processes.
• * The core acceleration mechanism for flares and CME-driven shocks may be identical.

Conclusions:

• * The standard model of particle acceleration in solar flares and CMEs requires revision.
• * Current sheet formation and subsequent turbulence are key to understanding particle acceleration.
• * Differences in solar flares and CME-driven shocks are attributed to variations in magnetic topology, plasma parameters, and driver duration.
• * This research suggests a unified view of acceleration mechanisms in explosive solar events.