Dynamics Explorer: Difference between revisions

Revision as of 02:12, 24 November 2021

Revision as of 04:31, 30 November 2021

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{{REMOVE THIS TEMPLATE WHEN CLOSING THIS AfD|Dynamics Explorer}}

{{Short description|NASA satellite of the ExplorerExplorers programProgram}}

{{Use American English|date=November 2021}}

{{Use dmy dates|date=November 2021}}

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| instruments = Energetic Ion Composition Spectrometer (EICS)<br/>High Altitude Plasma Instrument (HAPI)<br/>Magnetic Field Observations Triaxial Fluxgate Magnetometer (MAG-A)<br/>Plasma Wave Instrument (PWI)<br/>Retarding Ion Mass Spectrometer (RIMS)<br/>Spin-scan Auroral Imager (SAI)

| programme = '''ExplorerExplorers programProgram'''

| previous_mission = [[Explorer 61|Explorer 61 (Magsat)]]

| next_mission = [[Explorer 63]] ([[Dynamics Explorer 2]])

}}

{{Short description|NASA satellite of the ExplorerExplorers programProgram}}

{{Use American English|date=November 2021}}

{{Use dmy dates|date=November 2021}}

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| instruments = Fabry–Pérot interferometer (FPI)<br/>Ion Drift Meter<br/>Langmuir probe<br/>Low-altitude Plasma Instrument<br/>Magnetometer<br/>Neutral Atmosphere Composition Spectrometer<br/>Retarding Potential Analyzer<br/>Vector Electric Field Instrument<br/>Wind and Temperature Spectrometer (WATS)

| programme = '''ExplorerExplorers programProgram'''

| previous_mission = [[Explorer 62]] ([[Dynamics Explorer 1]])

| next_mission = [[Solar Mesosphere Explorer|Explorer 64 (Solar Mesophere Explorer)]]

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== Spacecraft ==

The spacecraft approximated a short polygon {{cvt|137|cm}} in diameter and {{cvt|115|cm}} high. The antennas in the X-Y plane measured {{cvt|200|cm}} tip-to-tip, and on the Z-axis are {{cvt|9|m}} tip-to-tip. Two {{cvt|6|m}} booms are provided for remote measurements. Power is supplied by a solar cell array, mounted on the side and end panels. The spacecraft is [[Spin-stabilisation|spin-stabilized]], with the spin axis normal to the orbital plane, and the spin rate at 10 ± 0.1 [[Revolutions per minute|rpm]]. A [[pulse-code modulation]] (PCM) [[Telemetry|telemetry data system]] is used that operates in real time or in a [[tape recorder]] mode. Data have been acquired on a science-problem-oriented basis, with closely coordinated operations of the various instruments, both satellites, and supportive experiments. Data acquired from the instruments are temporarily stored on tape recorders before transmission at an 8:1 playback-to-record ratio. Additional operational flexibility allows a playback-to-record ratio of 4:1. The primary data rate is 16,384 [[Bit rate|bits per second]]. Since commands are stored in a command memory unit, spacecraft operations are not real time, except for the transmission of the wideband analog data from the Plasma Wave Instrument (1981-070A-02). On 22 October 1990, the science operations were terminated. On 28 February 1991, Dynamics Explorer 1 operations were officially terminated.<ref name="Display"/>

[[tape recorder]] mode. Data have been acquired on a science-problem-oriented basis, with closely coordinated operations of the various instruments, both satellites, and supportive experiments. Data acquired from the instruments are temporarily stored on tape recorders before transmission at an 8:1 playback-to-record ratio. Additional operational flexibility allows a playback-to-record ratio of 4:1. The primary data rate is 16,384 [[Bit rate|bits per second]]. Since commands are stored in a command memory unit, spacecraft operations are not real time, except for the transmission of the wideband analog data from the Plasma Wave Instrument (1981-070A-02). On 22 October 1990, the science operations were terminated. On 28 February 1991, Dynamics Explorer 1 operations were offically terminated.<ref name="Display"/>

=== Dynamics Explorer 1 Instrumentationinstrumentation ===

Dynamics Explorer 1 carried the following instruments:<ref name="Display"/>

* Energetic Ion Composition Spectrometer (EICS)

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[[Ionosphere]], [[magnetosphere]], [[Plasmasphere|plasmapause]], [[plasmasphere]], and trapped particle belts.

=== Dynamics Explorer 2 Instrumentationinstrumentation ===

The Dynamics Explorer 2 carried the following instruments for data collection:

* [[Fabry–Pérot interferometer]] (FPI), which measured the meridional component of the neutral winds.<ref name=Spencer1982/> (The meridional wind component is the component in the direction of lines of longitude - i.e. North–South.)

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== See also ==

{{Portal|Spaceflight}}

* [[ExplorerExplorers programProgram]]

== References ==

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* [http://www-pi.physics.uiowa.edu/sai/gallery/ Dynamics Explorer image gallery]

{{ExplorerExplorers programProgram}}

[[Category:NASA satellites orbiting Earth]]