Collaborative Research Activities of the Arase and Van Allen Probes

Area of Science:

• Space Physics
• Magnetospheric Physics
• Plasma Physics

Background:

• The inner magnetosphere and radiation belts are crucial regions for understanding space weather.
• Dynamic phenomena in these regions are complex, requiring multi-point observations.
• Previous observations have limitations in spatial and temporal resolution.

Purpose of the Study:

• To present highlights of joint Arase and Van Allen Probes observations of the inner magnetosphere.
• To separate spatial and temporal structures of dynamic phenomena using concurrent mission data.
• To provide a comprehensive long-term observation of the inner magnetosphere and radiation belts.

Main Methods:

• Joint observations by Arase and Van Allen Probes spacecraft (2017-2019).
• Utilizing ground-based experiments integrated into spacecraft programs.
• Analysis of plasma and wave data at longitudinally and geomagnetically conjugate locations.
• Instrument intercalibration between the two missions.

Main Results:

• Successful separation of spatial and temporal structures of inner magnetosphere phenomena.
• Detection of similar plasma and wave variations by both missions after March 2017.
• Arase spacecraft extended observations to higher L-shells (up to 5.8).
• Instrument intercalibrations confirmed data consistency.

Conclusions:

• Combined Arase and Van Allen Probes observations provide unprecedented insights into the inner magnetosphere.
• The extended observation period covering a full solar cycle is vital for long-term studies.
• This comprehensive dataset will advance our understanding of radiation belt dynamics and space weather.