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Dust measurements at high ecliptic latitudes.

M Baguhl, D P Hamilton, E Grün

    Science (New York, N.Y.)
    |May 19, 1995
    PubMed
    Summary
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    Ulysses spacecraft data revealed interstellar dust impacts and an additional flux of small particles at high southern latitudes. These smaller particles may be beta-meteoroids ejected from the inner solar system.

    Area of Science:

    • * Solar System Exploration
    • * Cosmic Dust Studies
    • * Interstellar Medium

    Background:

    • * The Ulysses spacecraft traversed regions from Jupiter to the south ecliptic pole.
    • * Understanding dust composition and origin is crucial for solar system and interstellar medium research.

    Purpose of the Study:

    • * To analyze dust impact data collected by the Ulysses spacecraft.
    • * To identify the origin and characteristics of detected dust particles.
    • * To investigate the nature of an unusual dust flux observed at high southern latitudes.

    Main Methods:

    • * Utilized onboard dust detector data from the Ulysses spacecraft.
    • * Analyzed dust impact rates and directional information.
    • * Correlated dust flux variations with spacecraft trajectory and solar system phenomena.

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    Main Results:

    • * Measured a slow variation in dust impact rate (0.2-0.5 impacts/day).
    • * Identified a dominant dust flux component originating from an interstellar direction (100° ecliptic latitude, 280° ecliptic longitude).
    • * Observed an additional flux of small particles south of -45° latitude, distinct from interstellar and zodiacal dust.

    Conclusions:

    • * The primary dust component detected has an interstellar origin.
    • * The additional flux of small particles may represent beta-meteoroids.
    • * Beta-meteoroids are potentially accelerated by solar radiation pressure and electromagnetic forces.