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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

  5. The Magnetosphere

  6. Electromagnetic Effects • Sudden Ionospheric Disturbance • Lightning • Whistler Waves • LEP and Early/Fast Events • Mesopheric lightning discharges • Sprites, elves, blue jets, TGFs

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

  8. SID Event – an Example Quiet Day Active Day

  9. Lightning Detection NS Incident wave S Φ EW

  10. Whistlers in the Magnetosphere

  11. Whistler Wave – an Example

  12. LEP/Early Fast Events

  13. LEP/Early Fast – an Example

  14. Mesospheric Phenomenon

  15. Runaway Electrons

  16. Sprites, TGFs and Sferics Lightning induced emissions can be studied through the signature of the lightning’s sferic

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

  18. 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

  19. SID Detector - Pictures Pre-Amp DataQ Post-Amp Wire Loop Antenna

  20. The AWESOME Receiver • Designed by Morris Cohen, Justin Tan • Ultra sensitive • Medium cost (~$2000) • Narrowband amplitude/phase • Broadband 100kHz data • Deployed worldwide • Auto-calibration A tmosphericW eatherE ducationalS ystem forO bservation andM odeling ofE ffects

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

  22. AWESOME Receiver – Pictures

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

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

  25. 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 • Eventual goal of dozens more • Distribute selected AWESOME detectors

  26. 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?

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

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