Plasma wave observations at comet giacobini-zinner.

Area of Science:

• Space Physics
• Cometary Science
• Plasma Physics

Background:

• The International Cometary Explorer (ICE) spacecraft investigated comet Giacobini-Zinner.
• Understanding plasma wave phenomena and particle interactions near comets is crucial for deciphering cometary environments.

Purpose of the Study:

• To analyze plasma wave data collected by the ICE spacecraft near comet Giacobini-Zinner.
• To investigate wave-particle interactions, electron heating, and dust distribution in the comet's vicinity.

Main Methods:

• Utilized the plasma wave instrument on the ICE spacecraft.
• Analyzed electromagnetic and electrostatic wave data, electron heating phenomena, and dust impact data.

Main Results:

• Detected strong ion acoustic waves, electromagnetic whistlers, and electron plasma oscillations within 2 million kilometers of the nucleus.
• Observed significant increases in wave levels near the bow shock, correlated with electron heating.
• Recorded broadband waves possibly responsible for electron heating and strong wave-particle interactions.
• Measured broadband electrostatic noise and electron plasma oscillations, yielding a density profile of the plasma tail.
• Detected nonuniform dust impacts, providing a preliminary dust distribution profile.

Conclusions:

• The observed plasma waves and interactions provide insights into heavy ion pickup and electron heating processes.
• Findings contribute to understanding ionization mechanisms within cometary comas.
• Preliminary dust distribution data offers insights into cometary particle environments.