1 FIREBIRD Science Overview Marcello Ruffolo Nathan Hyatt Jordan Maxwell 2 August 2013FIREBIRD Science.

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Presentation transcript:

1 FIREBIRD Science Overview Marcello Ruffolo Nathan Hyatt Jordan Maxwell 2 August 2013FIREBIRD Science

FIREBIRD Focused Investigations of Relativistic Electron Burst Intensity, Range, and Dynamics 1.5-unit cube-satellite mission investigating relativistic electron microbursts Two low-earth-orbiting satellites studying radiation belt dynamics 2 2 August 2013 FIREBIRD Science

Fundamental Concepts Radiation Belts L-Shell Electron Microbursts Whistler-Mode Chorus Radiation Belt Electrons Loss Cone Gyro-Resonant Interaction 3 2 August 2013 FIREBIRD Science

L-Shell 4 2 August 2013 FIREBIRD Science Magnetic field strength calculated using L-shell, location, and time

L-Shell 5 2 August 2013 FIREBIRD Science

Radiation Belts Bands of charged particles trapped in Earth’s magnetic fields –Inner belt from L=1.5 to L=2 –Outer belt from L=4 to L=6 6 2 August 2013 FIREBIRD Science

Magnetic Local Time Measurement of time with axis about the magnetic pole 7 2 August 2013 FIREBIRD Science

Electron Microbursts Localized region of precipitating electrons –Lost from the Van Allen radiation belts and precipitate down onto the ionosphere (upper atmosphere) Occur on a short timescale (~0.2s) Observed predominantly from L=4 to L=6 in the morning sector (3MLT to 9MLT) Believed to be correlated to chorus waves generated in the near equatorial region 8 2 August 2013 FIREBIRD Science

Electron Microbursts May occur in trains ranging from 10s to several hours with ~0.5s spacing between bursts 9 2 August 2013 FIREBIRD Science Black-dashed line: Estimate of locally-trapped population Blue-dotted line: Position in L-Shell Orange spikes: Relativistic Microburst events

Whistler-Mode Chorus Bursts of very-low frequency (VLF) electromagnetic emissions Propagate within plasma in radiation belts Frequencies range from hundreds of Hz to several kHz Timescale of ~1s, but may occur in trains –Train timescales match those of microbursts Right-hand polarized (RHP) waves 10 2 August 2013 FIREBIRD Science

Whistler-Mode Chorus 11 2 August 2013 FIREBIRD Science

Whistler-Mode Chorus 12 2 August 2013 FIREBIRD Science Chorus appears in two bands –Upper-Band Chorus –Lower-Band Chorus Correlation with energy bands of microbursts Bell et al 2009

Radiation Belt Electrons Electrons have right-hand cyclotron motion about field lines Cyclotron frequency: Electrons >1 MeV are relativistic: 13 2 August 2013 FIREBIRD Science

Loss Cone Shape in velocity space –Represents probability that electrons will precipitate off the magnetic field lines –Dimensions determined by angle between velocity and magnetic field lines (pitch angle) Condition for a loss cone: –Where is measured on a specific L-shell –Pitch angle: 14 2 August 2013 FIREBIRD Science

Gyro-Resonant Interaction Interaction between radiation-belt electrons and whistler-mode chorus waves Conditions for interaction –Wave frequency equals electron gyro-resonant frequency Wave frequency less than electron cyclotron frequency Requires that wave and electron be travelling toward each other, so that Doppler-shift can allow for comparable frequencies –Wave and electron must be similarly polarized Whistler-mode chorus and electron cyclotron both RHP 15 2 August 2013 FIREBIRD Science

Gyro-Resonant Interaction Gyro-resonant interaction scatters electron pitch angles –Some electrons have low enough pitch angles to enter loss cone and precipitate into ionosphere This precipitation is an electron microburst Most accepted theory 16 2 August 2013 FIREBIRD Science

FIREBIRD Mission The FIREBIRD mission consists of two satellites operating simultaneously to answer the following: –What is the spatial scale size of an individual microburst? –What is the energy dependence of an individual microburst? –How much total electron loss from the radiation belts do microburst's produce globally? 17 2 August 2013 FIREBIRD Science

Spatial Scale Size Multi-point measurement required to determine spatial scale size FIREBIRD payloads separate at ~8 cm/s –Current orbital scenarios estimate payloads will exceed 150 km (a landmark value mentioned in the FIREBIRD proposal) after about 2.5 months GPS coordinates resolved with science data will provide estimates of spatial scale size 18 2 August 2013 FIREBIRD Science

Energy Dependence Lower energy bursts (tens to hundreds of keV) can resonate at the equator with whistler-mode chorus waves Higher energy bursts typically occur between 60º- 66º latitude Energy of microburst's correlated with chorus bands August 2013 FIREBIRD Science

Global Electron Loss Use data from RBSP and BARREL to complement FIREBIRD Microbursts are believed to be a primary loss mechanism of radiation-belt electrons 20 2 August 2013 FIREBIRD Science

Global Electron Loss Remove charged particles from the radiation belts Various mechanisms –Microbursts –General precipitation –Other less prevalent mechanisms (account for small percentage of loss) 21 2 August 2013 FIREBIRD Science

Why do we care? Fill in gaps in understanding of radiation-belt phenomena Strengthening correlation between EMBs and whistler-mode chorus Enhancing conclusions drawn by past and present satellite missions by providing missing information Educational opportunity for students involved 22 2 August 2013 FIREBIRD Science

Questions? 23 2 August 2013 FIREBIRD Science