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Stanford VLF Remote Sensing Science, Engineering, Educational outreach

Stanford VLF Remote Sensing Science, Engineering, Educational outreach. Morris Cohen Along with Phil Scherrer, Deborah Scherrer, Umran Inan, Ray Mitchell, Justin Tan Space, Telecommunications and Radioscience Laboratory Stanford University Stanford, California 94305

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Stanford VLF Remote Sensing Science, Engineering, Educational outreach

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  1. Stanford VLF Remote SensingScience, Engineering, Educational outreach Morris Cohen Along with Phil Scherrer, Deborah Scherrer, Umran Inan, Ray Mitchell, Justin Tan Space, Telecommunications and Radioscience Laboratory Stanford University Stanford, California 94305 http://www-star.stanford.edu/~vlf/ http://sun.stanford.edu

  2. Stanford VLF Remote Sensing • The collaborators • Ionosphere/magnetosphere overview • Electromagnetic effects • SID Receiver • AWESOME Receiver • Educational Outreach

  3. The Stanford Collaborators • Phil/Deborah Scherrer • Ray Mitchell • Umran Inan • Morris Cohen • Justin Tan • Center for Integrated Space Weather Modeling (CISM)

  4. The Ionosphere Source: HAARP

  5. The Magnetosphere Source: NASA, Rice University

  6. Electromagnetic Effects • Solar Flare Detection • Cosmic Gamma Rays • Chorus Emissions • Lightning • Whistler waves • LEP Events, hurricane studies • Early/fast Events • Mesospheric lightning discharges • Sprites, elves, blue jets, TGFs

  7. Sudden Ionospheric Disturbance • Strong solar flares penetrate to lower ionospheric region, cause transient changes

  8. VLF Transmitters Source: Great Circle Mapper, Karl Swartz

  9. SID Event – an Example Quiet Day NLK 24.8 kHz Active Day Source: Ray Mitchell

  10. SID Event – an Example GOES Data NLK 24.8 kHz Active Day

  11. Cosmic Gamma Rays

  12. Chorus Emissions

  13. Lightning Detection NS Incident wave S Φ EW

  14. Whistlers in the Magnetosphere

  15. Whistler Wave – an Example

  16. Lightning Induced Electron Precipitation (LEP Events) Source: Bill Peter

  17. LEP Events – an Example Hurricane Isabel

  18. Early Fast Events Source: Bill Peter

  19. Mesospheric Phenomenon Source: Nikolai Lehtinen

  20. Runaway Electrons Source: Nikolai Lehtinen

  21. Sprites and Early/Fast Events Early fast events are highly correlated with sprites, indicating connection with ionospheric heating and runaway electrons Source: Robert Marshall

  22. TGFs and Sferics

  23. The Hardware • SID Detector • AWESOME Receiver A tmosphericW eatherE ducationalS ystem forO bservation andM odeling ofE ffects

  24. The SID Detector • Designed by Ray Mitchell • Low cost, compact, easy to use • Narrowband amplitude receiver • 1 sample per 5 seconds

  25. The SID Detector – Overview Pre-Amp All frequencies Coax 24.8KHz Filter DC voltage Level Signal Strength = 10 bit, Analog to Digital Conversion Sample every 5 Seconds DATAQ Computer RS-232 Source: Ray Mitchell

  26. SID Detector - Pictures Pre-Amp DataQ Post-Amp Wire Loop Antenna Source: Ray Mitchell

  27. The AWESOME Receiver • Designed by Morris Cohen, Justin Tan • Ultra sensitive • Medium cost (~$2000) • Narrowband amplitude/phase • Broadband 100kHz data • Deployed worldwide • Auto-calibration

  28. AWESOME Receiver – Overview B-Field Antenna GPS Antenna Computer Long Cable Line Receiver Analog to Digital Preamp

  29. AWESOME Receiver – Pictures

  30. AWESOME Receiver – Data Data taken from Palmer Station, Antarctica

  31. More Data, Calibration Data taken from Homer, Alaska

  32. Educational Outreach • Center for Integrated Space Weather Modeling (CISM) • Run by Boston University • Stanford selected for educational outreach • Distribute SID detectors widely • 3 Beta sites working • 100 units in production • 3 foreign sites planned (Tanzania, India, Tibet) • Distribute selected AWESOME detectors

  33. Educational Outreach (con’t) • Research purpose • data sent to Stanford via internet, DVDs • Educational purposes • Monitor solar flares/VLF activity • Build antenna, maintain electronics • Participate in research campaigns • Promote in developing countries through UN? • http://solar-center.stanford.edu/~SID • http://www-star.stanford.edu/~hail/

  34. ? Q u e s t i o n s

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