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MAGGEX

MAGGEX. Post-Flight Analysis. Magnetic Field Overview. B=B m +B c +B d B m : Earth’s fluid conducting outer core 95% of measured field B c : Magnetized rocks in crust (~.02 mG) B d : Currents induced in magnetosphere by solar and extraterrestrial activity (~.250mG)

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MAGGEX

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  1. MAGGEX Post-Flight Analysis

  2. Magnetic Field Overview • B=Bm+Bc+Bd • Bm: Earth’s fluid conducting outer core • 95% of measured field • Bc : Magnetized rocks in crust (~.02 mG) • Bd : Currents induced in magnetosphere by solar and extraterrestrial activity (~.250mG) • Expect to see change from 492 mG at ground level to 484 mG at 100,000ft

  3. Issues • Instability of measurement during flight • Due to movement of payload • No data collected past 28 minutes of flight, ~30,000 ft. • Unresolved • Low-pass filter applied, overall downward trend apparent, but not enough data

  4. Induced Payload Instability

  5. Internal Temperature

  6. Potential Sources of Failure • Loss of power? • RTC never stopped, power still on when payload recovered • EEPROM Problem? • Post mortem analysis shows full data can be written without error • Temperature Problem? • At 30,000, entering Stratosphere • In tests, payload survived to -2 C, internal temp showed payload electronics above 10 C • Mechanical Failure? • Switch lodged between on and off state, halting software but keeping low power? • Chip software was never reset • Soldering error? • During cold, joint dislodged, at some later point, inadvertently knocked back into place?

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