This page summarizes information about the selected resource and its origin based on SPASE metadata.
SPASE version 2.0.1
This data set includes the electric field and convection drift information from the CRRES spacecraft. The langmuir probe instrument data is at 30 s resolution. The files include the electric field vectors, elcetric field magnitude, and the convection drift vectors from both the spherical sensors and the cylindrical antennas.
NASA NSSDC CRRES Langmuir Probe Instrument
NASA; Department of Defense-Department of the Air Force (United States); AFRL; Prof. Forrest S. Mozer; Dr. E. Gary Mullen
| Role | Person | |
|---|---|---|
| 1. | Principal investigator | Prof. Forrest S. Mozer XML |
| 2. | Principal investigator | Dr. E. Gary Mullen XML |
| 3. | Metadata contact | James M. Weygand XML |
NASA; Department of Defense-Department of the Air Force (United States); AFRL; Prof. Forrest S. Mozer; Dr. E. Gary Mullen
Time format in data files is: Year-Month-Day Hour Minute Second (YYYY-MM-DDTHH:MM:SS.SSS)
Universal Time columns from left to right are: year month day hour minute sec in the format of yyyy mm dd hh mm ss.
Flag=9999-12-31T23:59:59Z
Universal Time expressed using a 6-column day, month, year, hour, minute, second representation
| Index | Name | Parameter key |
|---|---|---|
| 1 | Year | Year |
| 2 | Month | Month |
| 3 | Day | Day |
| 4 | Hour | Hour |
| 5 | Minute | Minute |
| 6 | Second | Second |
Langmuir probe instrument spherical antenna electric field vectors from CRRES. The coordinate system is a modified coordinate system with the x-axis pointing toward the sun, the y-axis pointing toward the dusk, and the z-axis pointing along the north ecliptic pole.
Flags=99999; The coordinate system is a modified coordinate system with the x-axis pointing toward the sun, the y-axis pointing toward the dusk, and the z-axis pointing along the north ecliptic pole.
| Index | Name | Parameter key |
|---|---|---|
| 1 | EX-MGSE | Ex |
| 2 | EY-MGSE | Ey |
| 3 | EZ-MGSE | Ez |
Langmuir probe instrument spherical antenna electric field magnitudes from CRRES.
Flags=99999
Langmuir probe instrument cylindrical antenna electric field vectors from CRRES. The coordinate system is a modified coordinate system with the x-axis pointing toward the sun, the y-axis pointing toward the dusk, and the z-axis pointing along the north ecliptic pole.
Flags=99999; The coordinate system is a modified coordinate system with the x-axis pointing toward the sun, the y-axis pointing toward the dusk, and the z-axis pointing along the north ecliptic pole.
| Index | Name | Parameter key |
|---|---|---|
| 1 | EX-MGSE | Ex |
| 2 | EY-MGSE | Ey |
| 3 | EZ-MGSE | Ez |
Langmuir probe instrument cylindrical antenna electric field magnitudes from CRRES.
Flags=99999
Langmuir probe instrument spherical antenna convection drift velocity vectors from CRRES. The coordinate system is a modified coordinate system with the x-axis pointing toward the sun, the y-axis pointing toward the dusk, and the z-axis pointing along the north ecliptic pole.
Flags=99999; The coordinate system is a modified coordinate system with the x-axis pointing toward the sun, the y-axis pointing toward the dusk, and the z-axis pointing along the north ecliptic pole.
| Index | Name | Parameter key |
|---|---|---|
| 1 | VX-MGSE | Vx |
| 2 | VY-MGSE | Vy |
| 3 | VZ-MGSE | Vz |
Langmuir probe instrument cylindrical antenna convection drift velocity vectors from CRRES.
Flags=99999
| Index | Name | Parameter key |
|---|---|---|
| 1 | VX-MGSE | Vx |
| 2 | VY-MGSE | Vy |
| 3 | VZ-MGSE | Vz |
CRRES angle between the magnetic field and the spin plane at 30 s resolution in untis of degrees.
Flags=99999
SPASE version 2.0.0
The Langmuir probe was designed to measure the temperature and density of cold electrons and the electric fields in the magnetosphere, as well as their spatial and temporal fluctuations. The purpose was to better understand the wave-particle interactions. The probe instrument consisted of two pairs of orthogonal booms with tip-to-tip separations of 100 m. They were located in the spin plane of the satellite. One pair of booms carried spherical sensors and the other cylindrical antennas. An onboard microprocessor controlled the operating mode. In the Langmuir probe mode the spherical sensors were biased at fixed potentials relative to the ambient plasma and the currents collected by the sensors provided the temperature and the density of the plasma electrons. In the electric field mode both pairs of sensors were current-biased and monitored the electric field. The energy range of the measured ambient plasma was up to 10 eV and the frequency range of the measured electric field was from dc to 1 kHz. This experiment was part of the SPACERAD project sponsored by AFGL.
Information about the Langmuir Probe Instrument experiment on the CRRES mission.
| Role | Person | |
|---|---|---|
| 1. | Principal investigator | Prof. Forrest S. Mozer XML |
| 2. | Principal investigator | Dr. E. Gary Mullen XML |
SPASE version 2.2.0
The Combined Release and Radiation Effects Satellite (CRRES) was launched into a geosynchronous transfer orbit (GTO) for a nominal three-year mission to investigate fields, plasmas, and energetic particles inside the Earth's magnetosphere. As part of the CRRES program the SPACERAD (Space Radiation Effects) project, managed by Air Force Geophysics Laboratory, investigated the radiation environment of the inner and outer radiation belts and measured radiation effects on state-of-the-art microelectronics devices. Other magnetospheric, ionospheric, and cosmic ray experiments were included onboard CRRES and supported by NASA or the Office of Naval Research. The chemical release project was managed by NASA/MSFC and utilized the release of chemicals from onboard cannisters at low altitudes near dawn and dusk perigee times and at high altitudes near local midnight. The chemical releases were monitored with optical and radar instrumentation by ground-based observers to measure the bulk properties and movement of the expanding clouds of photo-ionized plasma along field lines after the releases occurred. In order to study the magnetosphere at different local times during the mission, the satellite orbit was designed to precess with respect to the earth-sun line such that the local time at apogee decreased by 2.5 minutes/day from 08:00 (LT) just after launch and returned to this position in nineteen-month cycles. The CRRES spacecraft had the shape of an octagonal prism with solar arrays on the top side. The prism is 1 m high and 3 m between opposite faces. Four of the eight compartments were for the chemical canisters and the other four housed SPACERAD and other experiments. The spacecraft body was spun at 2.2 rpm about a spin axis in the ecliptic plane and kept pointed about 12 degrees ahead of the Sun's apparent motion in celestial coordinates. Pre-launch and in-flight operations were supported by the Space Test and Transportation Program Office of the U.S. Air Force Space Division. Contact with the CRRES spacecraft was lost on October 12, 1991 and was presumed to be due to onboard battery failure.
Information about the CRRES mission
| Role | Person | |
|---|---|---|
| 1. | Project scientist | Dr. Susan Gussenhoven-Shea XML |
| 2. | Project scientist | Dr. David L. Reasoner XML |
SPASE version 2.2.0
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SPASE version 2.0.1
The Virtual Magnetospheric Observatory Data Repository hosted by the Institute of Geophysics and Planetary Physics, University of California, Los Angeles.
The main web page for information concerning data holdings hosted by the Virtual Magnetospheric Observatory Data Repository.
If data downloaded from the VMO Data Repository are used in publication kindly acknowledge the Virtual Magnetospheric Observatory, Institute of Geophysics and Planetary Physics, University of California, Los Angeles for providing access to the data.
| Role | Person | |
|---|---|---|
| 1. | Principal investigator | Raymond J Walker XML |
| 2. | Metadata contact | Lee Frost Bargatze XML |