"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." (Ref. 1) "How it works: The photons are collected through a collimator tube that restricts the field of view to a cone approximately five degrees full width angle, tilted at 35 degrees from the zenith. A 2.5 nm wide Hβ filter is mounted near the base of the collimator. Each photon incident on the two inch 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." (Ref. 1)
Version:2.2.2
"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." (Ref. 1) "How it works: The photons are collected through a collimator tube that restricts the field of view to a cone approximately five degrees full width angle, tilted at 35 degrees from the zenith. A 2.5 nm wide Hβ filter is mounted near the base of the collimator. Each photon incident on the two inch 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." (Ref. 1)
| 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 |
BARREL instrument documentation, quoted for above instrument description.