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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 (\ensuremath\alpha-meteoroids), unbound \ensuremath\be ...
Published by: \psj Published on: oct
YEAR: 2021   DOI: 10.3847/PSJ/abf928
Circumstellar dust; Interplanetary dust; Debris disks; Parker Data Used; Meteoroids; Meteor streams; 236; 821; 363; 1040; 1035; Astrophysics - Earth and Planetary Astrophysics; Physics - Space Physics
Nonlinear ion-acoustic waves, ion holes, and electron holes have been observed on the Parker Solar Probe at a heliocentric distance of 35 solar radii. These time domain structures contain millisecond duration electric field spikes of several mV m-1. They are observed inside or at boundaries of switchbacks in the background magnetic field. Their presence in switchbacks indicates that both electron- and ion-streaming electrostatic instabilities occur there to thermalize electron and ion beams.
Published by: The Astrophysical Journal Published on: 04/2021
YEAR: 2021   DOI: 10.3847/1538-4357/abed52