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- 9c9a60bf-0ac1-4e54-92bd-b6a5284649da definition "The Energetic Ion Spectrometer also gathers all-sky measurements of the energetic ions, gathering information about their energy, their arrival direction and their mass. EIS can determine the mass of these particles by measuring their velocity and total energy. The mass information helps determine how many protons, helium and oxygen ions are present at energies above those reachable by HPCE. To measure the energy, EIS uses a solid state detector like the one on FEEPS. Velocity is measured using two very thin foils and a microchannel plate sensor. When an ion travels through the first foil it knocks a few electrons off. These electrons are deflected toward the microchannel plate, which can amplify the signal, sending 1 million electrons out the other side -- just like the detectors used in the plasma suite. The ion continues traveling to the second foil, where a similar process occurs. By determining the time of flight between electron detection at the first and second foils, the instrument can determine the velocity of the original incoming particle. Combining the comprehensive ion measurements of EIS with the simpler ion measurements on FEEPS allows researchers to determine the ion properties at a faster rate of 1/3 of a spacecraft spin, a cadence that will sometimes be needed in the vicinity of fast changing reconnection sites. EIS development was led by the Johns Hopkins University Applied, Md." @default.
- 9c9a60bf-0ac1-4e54-92bd-b6a5284649da id "1655189" @default.
- 9c9a60bf-0ac1-4e54-92bd-b6a5284649da path_id 449b7d65-85e6-43a5-b87b-1071dc9936b2 @default.
- 9c9a60bf-0ac1-4e54-92bd-b6a5284649da path_id 4f81c61c-f100-4bc4-9664-d9b70d2f162f @default.
- 9c9a60bf-0ac1-4e54-92bd-b6a5284649da path_id 6015ef7b-f3bd-49e1-9193-cc23db566b69 @default.
- 9c9a60bf-0ac1-4e54-92bd-b6a5284649da path_id 717ba2ad-1580-46d5-8540-f59e9ec0dd56 @default.
- 9c9a60bf-0ac1-4e54-92bd-b6a5284649da path_id b2140059-b3ca-415c-b0a7-3e142783ffe8 @default.
- 9c9a60bf-0ac1-4e54-92bd-b6a5284649da path_label "Earth Remote Sensing Instruments" @default.
- 9c9a60bf-0ac1-4e54-92bd-b6a5284649da path_label "Instruments" @default.
- 9c9a60bf-0ac1-4e54-92bd-b6a5284649da path_label "Magnetic Field/Electric Field Instruments" @default.
- 9c9a60bf-0ac1-4e54-92bd-b6a5284649da path_label "Passive Remote Sensing" @default.
- 9c9a60bf-0ac1-4e54-92bd-b6a5284649da path_label "Spectrometers" @default.
- 9c9a60bf-0ac1-4e54-92bd-b6a5284649da prefLabel "MMS EIS" @default.
- 9c9a60bf-0ac1-4e54-92bd-b6a5284649da reference "" @default.
- 9c9a60bf-0ac1-4e54-92bd-b6a5284649da tag "Instruments" @default.