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Solar Cycle Dependence of Mass Density and Ion Composition at Geosynchronous Orbit

Investigating the relationship between solar cycles and mass density/ion composition at geosynchronous orbit. Results show mass density peaks at solar maximum while ion density peaks at solar minimum. Analysis suggests higher O+ concentration at solar maximum, with MPA underestimating O+ ion density by a factor of 4. Preliminary findings indicate key differences in ion composition across solar cycles.

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Solar Cycle Dependence of Mass Density and Ion Composition at Geosynchronous Orbit

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  1. Solar Cycle Dependence of Mass Density and Ion Composition at Geosynchronous Orbit Richard E. Denton, Dartmouth Kazue Takahashi, APL Michelle Thomsen, LANL

  2. Solar Cycle Dependence Mass density MPA ion density f10.7 f10.7

  3. Same But Just on Dayside

  4. MPA, total, low energy, and high energy – Still Dayside

  5. Conclusions • At geosynchronous orbit, the mass density peaks at solar maximum while ion density peaks at solar minimum, the opposite of the expected trend for electron density • This implies a much higher concentration of O+ at solar maximum. • VERY preliminary and not quite right: MPA underestimates ion density by a factor of 4 for O+. Assuming a H+/O+ plasma, we can use the average values at solar max and solar min to find nO+/ne = 0.42 and average ion mass M = 7 at solar max, and nO+/ne = 0.08 and M = 2.2 at solar min.

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