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Post-Flight Analysis of Magnetic Field Variations and Payload Instability

This report provides an analysis of magnetic field variations observed post-flight, detailing the contributions from Earth's outer core (Bm), magnetized crust (Bc), and induced currents from solar activity (Bd). Significant changes were noted, with ground-level readings at 492 mG dropping to 484 mG at 100,000 ft. Issues encountered during the flight include measurement instability due to payload movement, loss of data after 28 minutes, and unresolved temperature challenges in the stratosphere. Potential sources of failure, including power loss and mechanical issues, are also examined.

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Post-Flight Analysis of Magnetic Field Variations and Payload Instability

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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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