Experimental study on chorus emission in an artificial magnetosphere

Area of Science:

• Plasma physics
• Space physics
• Astrophysics

Background:

• Wave particle interaction is crucial for geospace and space weather.
• Whistler mode chorus emissions drive particle acceleration in radiation belts and cause pulsating aurora.
• Existing research relies on theoretical models and spacecraft data, highlighting a need for controlled experiments.

Purpose of the Study:

• To investigate the spontaneous excitation of chirping whistler waves in a laboratory setting.
• To understand the generation and nonlinear growth of coherent chorus emissions in a dipole magnetic field configuration.
• To provide a high-resolution, reproducible experimental platform for studying space weather phenomena.

Main Methods:

• Utilized a levitated dipole experiment to create an
• artificial magnetosphere
• with hot-electron, high-beta plasma.
• Observed the spontaneous excitation and nonlinear growth of whistler mode chorus emissions.

Main Results:

• Successfully generated chirping whistler waves in the laboratory plasma.
• Demonstrated the ubiquitous nature of chorus emission generation and nonlinear growth in a dipole magnetic configuration.
• Provided experimental evidence supporting theoretical models of chorus emissions.

Conclusions:

• Laboratory experiments in an artificial magnetosphere can effectively replicate and study space weather phenomena.
• The findings confirm that chorus emissions are a common feature in dipole magnetic environments.
• This research paves the way for accelerated laboratory investigations into space weather dynamics.