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BARREL Update (Balloon Array for RBSP Relativistic Electron Losses)

BARREL Update (Balloon Array for RBSP Relativistic Electron Losses). R. M. Millan and the BARREL Team. BARREL project overview. Two Antarctic science campaigns during RBSP mission 20 balloon launched each campaign in 2012 and 2013 Launched successively to set up slowly drifting array

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BARREL Update (Balloon Array for RBSP Relativistic Electron Losses)

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  1. BARREL Update(Balloon Array for RBSP Relativistic Electron Losses) R. M. Millan and the BARREL Team

  2. BARREL project overview Two Antarctic science campaigns during RBSP mission 20 balloon launched each campaign in 2012 and 2013 Launched successively to set up slowly drifting array LDB flights => ~30 day campaign duration >3000 hours of data in radiation belt region (L<7) Launch sites: South African Antarctic Station (SANAE) and Halley Bay Phase B test flights Piggyback flight in December 2008 Test campaign from McMurdo in December 2009 • BARREL is a multiple-balloon experiment designed to study relativistic electron precipitation.

  3. BARREL concept Launch Sites SANAE IV Halley Bay • BARREL uses an array of balloons to achieve its science objectives.

  4. Balloon observations of precipitation • Bremsstrahlung X-rays are produced as precipitating electrons collide with atmospheric neutrals (Foat et al., 1998) ~70 km • First observation of X-rays to MeV energies made in 1996 over Kiruna, Sweden. • Nearly stationary balloon platform => complementary to spacecraft measurements ~30 km

  5. Kiruna REP Event Riometer X-ray instrument (from Lorentzen, 1999)

  6. RBSP/Balloon Conjunctions Baseline: two campaigns separated by one year Measurements of BOTH microbursts and duskside precipitation during both camaigns. • Conjunctions with RBSP spacecraft in dusk and dawn sectors Dusk conjunctions in 2012 Hours Dawn conjunctions in 2013 Hours BARREL MLT

  7. Large-scale spatial structure 1845 UT 1840 UT L=6 L=6 L=4 L=4 18 MLT 18 MLT 18MLT 18MLT 6 MLT 6 MLT L=3.5 S2 S3 Balloon locations X-ray count rate ~800km separation • Precipitation simultaneously observed by two balloons on January 21, 2005

  8. BARREL project overview Two Antarctic science campaigns during RBSP mission 20 balloon launched each campaign in 2012 and 2013 Launched successively to set up slowly drifting array LDB flights => ~30 day campaign duration >3000 hours of data in radiation belt region (L<7) Launch sites: South African Antarctic Station (SANAE) and Halley Bay Phase B test flights Piggyback flight in December 2008 Test campaign from McMurdo in December 2009

  9. 2009 Piggyback Test Flight Charge controller Iridium Modem Flight DPU DC/DC Converter Box

  10. 2008/2009 Piggyback Test Flight Launch: McMurdo, Dec. 28, 2008 Duration: 54 days Altitude: 34 km (112 kft) Photo Courtesy D. Gregory NASA BPO

  11. Summary Plot: X-ray Count Rate

  12. Summary Plot: X-ray Count Rate Relativistic Precipitation

  13. ~10-100 keV Precipitation Event Balloon: L ~ 7, MLT ~ 5:30 X-ray Count Rate 9:00 UT

  14. THEMIS spacecraft at 9:00 UT BARREL Location TIPSOD

  15. THEMIS Data on Jan. 3, 2009 THEMIS AE Index SST electrons Electric Field

  16. Feb 14-15, 2009 X-ray Spectrum Counts/s Energy (keV)

  17. WHAT’S NEXT? Two Antarctic science campaigns during RBSP mission 20 balloon launched each campaign in 2012 and 2013 Launched successively to set up slowly drifting array LDB flights => ~30 day campaign duration >3000 hours of data in radiation belt region (L<7) Launch sites: South African Antarctic Station (SANAE) and Halley Bay Phase B test flights Piggyback flight in December 2008 Test campaign from McMurdo in December 2009

  18. 2009/2010 Test Campaign • Currently building hardware for 6 payloads. • Integration at Dartmouth starts at end of this month • Thermal Vac and test launch in Palestine, TX summer 2009 • Deploy to Antarctica November 2009 Prospective BARREL Configurations Prospective BARREL Configurations

  19. Objectives of BARREL with RBSP • Directly test models of wave-particle interactions. • Conjunctions between balloons and RBSP spacecraft => measurements of parameters needed to model interaction • Comparison of predicted and observed precipitating flux and energy distribution • Large-scale spatial structure and total loss rate estimates. • What are the most useful data products or methods for displaying data?

  20. Modeling EMIC Wave Growth • Input parameters for WHAMP during the Jan. 19, 2000 precipitation event. Parameters are mean values taken from LANL MPA, except magnetic field taken from IGRF and plasma composition which was taken from Meredith et al., (2003). ω/omegai • WHAMP calculation of the wave frequency for three branches of EMIC waves ωimaginary /omegai k k

  21. Barrel Primary Science Teams University of Washington NaI Scintillator Flight Computer UC Berkeley-SSL Power System Mission Assurance SE oversight Dartmouth College PI-Institution Systems Engineering Engineering Data Integration & Test UC Santa Cruz Magnetometer Ground Station GSFC + Balloon Program Office Programmatic, Management oversight CSBF MIP Launch Training

  22. The End

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