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Geoff Crowley, ASTRA Delores Knipp , NCAR Kelly Ann Drake , USAF Academy Jiuhou Lei , CU

Thermospheric Density Enhancements from Unexpected Energy Deposition During Bz North and Strong By Conditions. Geoff Crowley, ASTRA Delores Knipp , NCAR Kelly Ann Drake , USAF Academy Jiuhou Lei , CU. Thanks TIMEGCM /AMIE – Art Richmond/NCAR

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Geoff Crowley, ASTRA Delores Knipp , NCAR Kelly Ann Drake , USAF Academy Jiuhou Lei , CU

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  1. Thermospheric Density Enhancements fromUnexpected Energy Deposition During Bz North and Strong By Conditions Geoff Crowley, ASTRA Delores Knipp, NCAR Kelly Ann Drake , USAF Academy Jiuhou Lei, CU Thanks TIMEGCM /AMIE – Art Richmond/NCAR Data Providers – SuperDARN, DMSP, Ground Magnetometers

  2. DAYSIDE 8 12 16 4 20 0 14 10 6 18 CHAMP Neutral Density at ~400 km Aug 24, 2005 (day 236) *10-12Kg/m3 8 12 0 20 4 16 14 6 10 18 NIGHTSIDE *10-12Kg/m3

  3. DAYSIDE 8 12 16 4 20 0 14 10 6 18 CHAMP Neutral Density at ~400 km Aug 24, 2005 (day 236) *10-12Kg/m3 8 12 16 0 20 4 14 6 10 18 NIGHTSIDE *10-12Kg/m3

  4. Aug 24, 2005 (day 236) “lobes” appear at 6-8 UT in both hemispheres CHAMP TIMEGCM 6UT Shock, By turns strongly +ve

  5. Aug 24, 2005 (day 236) “lobes” appear at 6-8 UT in both hemispheres CHAMP TIMEGCM 9UT Bz turns south

  6. BY 06 09 UT BZ SW-VEL 09 UT 06

  7. AMIE 07:50UT F15 07:51UT POTENTIAL • AMIE (magnetometers, DMSP, SuperDARN) • 5 min cadence JOULE HTG FAC

  8. TIMEGCM forced with AMIE high latitude fields • AMIE (magnetometers, DMSP, SuperDARN) • 5 min cadence TIMEGCM 08:00 UT Outer Lat = 2.5° Vert. Wind (W) Neutral Density (RHO)

  9. TIMEGCM CHAMP

  10. TIMEGCM CHAMP

  11. 8 12 16 4 20 0 14 10 6 18 CHAMP Neutral Density at ~400 km *10-12Kg/m3 8 12 0 20 16 4 14 6 10 18 Southern Hem peak *10-12Kg/m3

  12. TIMEGCM RHO N-HEM 0700 UT

  13. BY 06 09 UT BZ SW-VEL 091545 UT 06

  14. AMIE 16:20 UT F15 16:20 UT POTENTIAL Note: Effect evident in AMIE as early as 15:45, but not seen by DMSP JOULE HTG FAC

  15. TIMEGCM 17:00 UT RHO W (Vert. Wind)

  16. AMIE 18:05 UT F15 18:05 UT POTENTIAL Morning Convection cell expanded JOULE HTG FAC

  17. CONCLUSIONS • Poynting Flux Enhancements • CHAMP sees unexpected density enhancements for BZ-north and strong BY events • DMSP sees strong Poynting flux enhancements at very high latitudes (Delores) • AMIE provides a global framework to confirm PF events • Poynting Flux Enhancements • TIMEGCM densities often mimic CHAMP observations • TIMEGCM reveals PF-events produce large density enhancements • Density enhancements tend to be isolated at high latitudes • Density decrease • Long-lived event from 16-24 UT produces density ‘hole’ • Density decrease measured by CHAMP • Hypothesis: depletions due to dynamical effect (Crowley - cells) • Gravity Waves • Large-scale gravity waves evident in TIMEGCM correspond to other CHAMP density structures (not discussed in detail)

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