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  Collisional Evolution of the Inner Zodiacal Cloud

Szalay, J. R., Pokorný, P., Malaspina, D. M., Pusack, A., Bale, S. D., Battams, K., et al. (2021). Collisional Evolution of the Inner Zodiacal Cloud. The Planetary Science Journal, 2(5): 185. doi:10.3847/PSJ/abf928.

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 Urheber:
Szalay, J. R., Autor
Pokorný, P., Autor
Malaspina, D. M., Autor
Pusack, A., Autor
Bale, S. D., Autor
Battams, K., Autor
Gasque, L. C., Autor
Goetz, K., Autor
Krüger, Harald1, Autor           
McComas, D. J., Autor
Schwadron, N. A., Autor
Strub, Peter1, Autor           
Affiliations:
1Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

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Schlagwörter: Circumstellar dust; Interplanetary dust; Debris disks; Meteoroids; Meteor streams
 Zusammenfassung: The zodiacal cloud is one of the largest structures in the solar system and strongly governed by meteoroid collisions near the Sun. Collisional erosion occurs throughout the zodiacal cloud, yet it is historically difficult to directly measure and has never been observed for discrete meteoroid streams. After six orbits with Parker Solar Probe (PSP), its dust impact rates are consistent with at least three distinct populations: bound zodiacal dust grains on elliptic orbits (α-meteoroids), unbound β-meteoroids on hyperbolic orbits, and a third population of impactors that may be either direct observations of discrete meteoroid streams or their collisional by-products ("β-streams"). The β-stream from the Geminids meteoroid stream is a favorable candidate for the third impactor population. β-streams of varying intensities are expected to be produced by all meteoroid streams, particularly in the inner solar system, and are a universal phenomenon in all exozodiacal disks. We find the majority of collisional erosion of the zodiacal cloud occurs in the range of 10–20 solar radii and expect this region to also produce the majority of pickup ions due to dust in the inner solar system. A zodiacal erosion rate of at least ∼100 kg s−1 and flux of β-meteoroids at 1 au of (0.4–0.8) × 10−4 m−2 s−1 are found to be consistent with the observed impact rates. The β-meteoroids investigated here are not found to be primarily responsible for the inner source of pickup ions, suggesting nanograins susceptible to electromagnetic forces with radii below ∼50 nm are the inner source of pickup ions. We expect the peak deposited energy flux to PSP due to dust to increase in subsequent orbits, up to 7 times that experienced during its sixth orbit.

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Sprache(n): eng - English
 Datum: 2021
 Publikationsstatus: Online veröffentlicht
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.3847/PSJ/abf928
 Art des Abschluß: -

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Titel: The Planetary Science Journal
  Andere : Planet. Sci. J.
Genre der Quelle: Zeitschrift
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Affiliations:
Ort, Verlag, Ausgabe: IOP Publishing
Seiten: - Band / Heft: 2 (5) Artikelnummer: 185 Start- / Endseite: - Identifikator: ISSN: 2632-3338
CoNE: https://pure.mpg.de/cone/journals/resource/2632-3338