This Document describes the BARREL Balloon 1D Optical Photometer Instrument.
Objective: To detect the Flux of visible Light at Wavelengths near 486.1 nm during a Relativistic Electron Precipitation Event. This will determine whether there are Protons accompanying the precipitating Electrons. Emissions near 486.1 nm are a Signature of precipitating Protons. Correlated Proton and Relativistic Electron Precipitation would support scattering by EMIC (Electromagnetic Ion Cyclotron) Waves at the Precipitation Mechanism. How it works: The Photons are collected through a Collimator Tube that restricts the Field of View to a Cone approximately 5° full-width angle, tilted at 35° from the Zenith. A 2.5 nm wide Hβ Filter is mounted near the Base of the Collimator. Each Photon incident on the 5 cm Diameter Photomultiplier Tube results in the Generation of a Charge Pulse. These Pulses then go into a charge-sensitive Pre-Amplifier, Discriminator, and Shaping Electronics, producing a TTL Pulse for each incident Photon. By counting the Number of Pulses, the Flux of the precipitating Protons can be determined. This Description is adapted from Reference #1 in the Information URL List.
Version:2.3.0
This Document describes the BARREL Balloon 1D Optical Photometer Instrument.
Objective: To detect the Flux of visible Light at Wavelengths near 486.1 nm during a Relativistic Electron Precipitation Event. This will determine whether there are Protons accompanying the precipitating Electrons. Emissions near 486.1 nm are a Signature of precipitating Protons. Correlated Proton and Relativistic Electron Precipitation would support scattering by EMIC (Electromagnetic Ion Cyclotron) Waves at the Precipitation Mechanism. How it works: The Photons are collected through a Collimator Tube that restricts the Field of View to a Cone approximately 5° full-width angle, tilted at 35° from the Zenith. A 2.5 nm wide Hβ Filter is mounted near the Base of the Collimator. Each Photon incident on the 5 cm Diameter Photomultiplier Tube results in the Generation of a Charge Pulse. These Pulses then go into a charge-sensitive Pre-Amplifier, Discriminator, and Shaping Electronics, producing a TTL Pulse for each incident Photon. By counting the Number of Pulses, the Flux of the precipitating Protons can be determined. This Description is adapted from Reference #1 in the Information URL List.
| Role | Person | |
|---|---|---|
| 1. | PrincipalInvestigator | spase://SMWG/Person/Robyn.Millan |
| 2. | CoInvestigator | spase://SMWG/Person/Robert.P.Lin |
| 3. | CoInvestigator | spase://SMWG/Person/Michael.P.McCarthy |
| 4. | CoInvestigator | spase://SMWG/Person/Mary.K.Hudson |
| 5. | CoInvestigator | spase://SMWG/Person/Mikhail.I.Panasyuk |
| 6. | MetadataContact | spase://SMWG/Person/Lee.Frost.Bargatze |
Overall BARREL Instrument Descriptions for the Arctic Flight MINIS North
BARREL Mission Foldout Sheet Overview Poster
Understanding Relativistic Electron Losses with BARREL, J. Atmos. and Sol.-Terr. Phys., 73(11-12), July 2011, pages 1425-1434 by R. Millan et al. Description of Science Output from BARREL Test Flights, includes Discussion of Instruments and Usage. DOI: https://doi.org/10.1016/j.jastp.2011.01.006
Site used for BARREL Science Team Information