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Captured 2 SS onsets in sci-orbit

In March 2023, the THEMIS Polar mission observed two significant substorm onsets, with detailed data available from various instruments. Real-time auroral electrojet (AE) measurements indicate potential risks over the next two years, prompting collaboration with NSF to maintain data integrity. Advanced tools are being developed to integrate AE data into the THEMIS database. Observations include localized intensifications and ion injections at Kiana, with capabilities to identify sources in space and corresponding ground signatures. Software solutions for data accuracy are also in development.

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Captured 2 SS onsets in sci-orbit

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  1. Captured 2 SS onsets in sci-orbit http://sscweb.gsfc.nasa.gov/tipsod THEMIS POLAR

  2. Mar-23: Two SS onsets THEMIS POLAR

  3. Mar-23: Two SS onsets THE FAST THA THB THC THD

  4. Mar-23: Two SS onsets, AE THEMIS in Fast Survey • Real-time AE available, but at risk in next 2 years • Collaborated with NSF to ensure its presence during THEMIS • Developing tools for inserting AE into THEMIS database

  5. TH-FGM Fast Survey Overview Mar-23: Two SS onsets, FGM THA THA-FGM Data Types Available THB FGE (8S/s) THC (leading) FGL (4S/s) THD FGH (128S/s) THE (trailing)

  6. ____ ____ ____ X: Y: Z: TH-FGL Overview THA-FGM FIT Data (3s) Available FLRs (Samson, ’92) Substorm Onset POLAR UVI/VIS Onset 10:58UT Intensifications

  7. GBO/GMAG/KIANA THC/FGL SST ESA THD/FGL • Local Intensification at Kiana • Seen at THD/B/A as: • Field aligned current • Injection, followed by: • Velocity Dispersed Ions • Can identify source in space • Can identify ground signatures SST ESA THB/FGL SST ESA THA/FGL SST ESA THE/FGL SST ESA

  8. Injection at low energies as well. ESA Ions on A/B/D/E

  9. Instrument Commissioning • ISSUES • FGM (at 2m) sees bus currents at spin tone/harmonics • Developing software solution: tone removal • Worst case effect: 0.2nT inaccuracy (does not affect science) • SCM (at 1m) also sees bus currents at spin tone/harmonics • Developing software solution: tone removal • Worst case effect: Limit use above 10Hz (use FGM below 10Hz) • SCM sees noise from BAU/IDPUat 8Hz/32Hz and harmonics • Solution demonstrated • Routine implementation ongoing

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