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Electron Phase-Space Holes and PWI

This study explores Electron Phase-Space Holes (EPSH) using data from Plasma Wave Instrument (PWI) antennas. We measure the velocity and length of EPSH, focusing on their velocity, length, and width distributions. Early attempts at waveform interpretation and cross-correlation analysis highlight the time lag and velocity characteristics of EPSH. Observations reveal a possible link between electron beams and EPSH in various environments, including the magnetotail and plasma sheets. We aim to uncover the origins of small amplitude EPSH and their distribution across different cosmic phenomena.

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Electron Phase-Space Holes and PWI

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  1. Electron Phase-Space Holesand PWI Paul Kintner Cornell University

  2. Outline • PWI antennas and wave form data • Measurement of velocity and length • Characteristics of individual (or at least small numbers) of electron phase-space holes (EPSH) • Statistics of EPSH; velocity, length, width

  3. PWI Antennas

  4. Waveform information

  5. Interpretation

  6. CrossCorrelationyieldstimelag

  7. Time lag yields velocity

  8. Example of Counter Propagation Opposite polarity

  9. Early Attempt at Wavelet Analysis

  10. Organization by Ve,th and lDe

  11. Organization in Space

  12. Distribution of Length

  13. Distribution of Velocity

  14. Width to Length Ratio

  15. CUSP

  16. Plasma Sheet

  17. Known and Unknown- A • EPSH are known to produced by electron beams from lab expt’s and FAST • Magnetotail results suggest an electron beam • Unable to find electron beams on Polar • Are small amplitude EPSH produced locally by electron beams or are they propagating from distant sources?

  18. Known and Unknown- BBroadband Electrostatic Noise

  19. Conclusions • EPSH are found nearly anywhere a broad band plasma wave receiver has flown • Plasma sheet and cusp • Bow shock • Solar wind • Jupiter • Saturn?

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