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THEMIS Ground Based Observatories (GBO)

THEMIS Ground Based Observatories (GBO). S. B. Mende, S. Harris. GBO shall monitor the auroral light and ionospheric currents across North America in order to localize the time, location, and evolution of the auroral manifestation of the substorm.

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THEMIS Ground Based Observatories (GBO)

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  1. THEMIS Ground Based Observatories (GBO) S. B. Mende, S. Harris

  2. GBO shall monitor the auroral light and ionospheric currents across North America in order to localize the time, location, and evolution of the auroral manifestation of the substorm. Themis mission requirement relating to GBO:Determine substorm onset time and substorm meridian magnetic local time (MLT) using ground ASIs (one per MLT hr) and GMAGs (two per MLT hr) with t_res<30s and dMLT<6 degrees respectively, in an 8hr geographic local time sector including the US.

  3. GBOs: A synoptic view of the aurora Global auroral image taken by IMAGE WIC. Proposed THEMIS ground sites.

  4. GBOs: A synoptic view of the aurora

  5. GBO/ASIs: Based on AGOs • Environmental protection/deployment and automation drawn from AGOs (flawless multi-year operation in Antarctica). • Prototype camera field tested in Canada • High cadence, high sensitivity • 1.8Mbits/s taking 3s images

  6. Summary Image Geodetic Grid Mapped Image Raw Image

  7. Primary science data daily via VSAT • Stream #1 (1.4kbps) • Monthly backups via disk swapping • Stream #2 (180 kbps)

  8. Flow down requirements for GBO: Shall cover 8 hrs of Geographic Local Time over North American segment (allows continuous 12 hr conjunctions with probes) Shall include at least one ASI per MLT hour within this geographic segment Shall include two auroral GMAG per hour (MLT) (high/low lat.) within this segment. Timing accuracy of phenomena observed shall be better than 10s absolute

  9. 5. ASI sensitivity: Detectable response for aurora shall be < 10kRayleigh 6. Sensitivity of GMAG instrument shall be < 1nT 7. The spatial resolution shall be sufficient to locate the substorm brightening with an accuracy of 100km

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