The Structure of the Large-Scale Heliosphere as Seen by Current Models

Area of Science:

• Space Physics
• Plasma Physics
• Astrophysics

Background:

• The heliosphere's complex structure is crucial for understanding space weather and cosmic ray propagation.
• Early analytical and numerical models laid foundational concepts for heliospheric research.

Purpose of the Study:

• To review current research on global heliosphere descriptions using analytical and numerical modeling.
• To highlight key concepts, classic works, and advancements in heliospheric modeling.

Main Methods:

• Review of analytical and numerical modeling approaches.
• Emphasis on magnetohydrodynamic (MHD), multi-fluid, kinetic-MHD, and hybrid frameworks.
• Critical discussion of model predictions versus observational data.

Main Results:

• Summary of current modeling efforts for the global heliosphere.
• Identification of key concepts and relevant historical research.
• Analysis of various numerical simulation frameworks.

Conclusions:

• Ongoing research aims to refine heliospheric models for accurate plasma/neutral flow and magnetic field descriptions.
• Discrepancies between model predictions and observations remain an active area of investigation.
• The physical relevance of specific heliospheric models, like 'croissant' models, requires further critical evaluation.