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Voyager 2 plasma wave observations at saturn
Science (New York, N.Y.)
|January 29, 1982
Summary
Voyager 2 detected similar plasma wave signatures at Saturn
Area of Science:
- Planetary Science
- Plasma Physics
- Aerospace Engineering
Background:
- Voyager 2's mission to Saturn provided unprecedented in-situ measurements of the planet's magnetosphere and its interactions with the solar wind.
- Understanding plasma wave phenomena is crucial for characterizing planetary magnetospheres and their dynamic processes.
Purpose of the Study:
- To analyze and compare plasma wave signatures during Voyager 2's inbound and outbound crossings of Saturn's bow shock.
- To investigate the diverse plasma wave phenomena observed within Saturn's magnetosphere and near its rings.
- To interpret observed plasma wave data in the context of magnetospheric asymmetries and temporal variations.
Main Methods:
- Analysis of plasma wave data collected by the Voyager 2 spacecraft during its Saturn encounters.
- Comparison of wave signatures from inbound (near local noon) and outbound (near local dawn) bow shock crossings.
- Identification and characterization of various plasma wave emissions, including electron plasma oscillations, resonance emissions, and radio noise.
Main Results:
- Similar plasma wave signatures were observed during the first inbound and last outbound bow shock crossings.
- Significant differences in other plasma wave measurements between inbound and outbound passes suggest magnetospheric asymmetries or temporal changes.
- A variety of plasma wave emissions, including electron plasma oscillations, hiss, chorus, and Saturn radio noise, were detected within the magnetosphere.
- Intense impulses interpreted as ring particle impacts were observed during the ring plane crossing.
Conclusions:
- Saturn's magnetosphere exhibits complex dynamics, with notable north-south or noon-dawn asymmetries influencing plasma wave propagation.
- The detection of ring particle impacts provides direct evidence of their interaction with the spacecraft.
- Voyager 2's plasma wave measurements offer valuable insights into Saturn's space environment and magnetospheric processes.
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