16 years of Ulysses Interstellar Dust Measurements in the Solar System: II. Fluctuations in the Dust Flow from the Data

Abstract

The Ulysses spacecraft provided the first opportunity to identify and study Interstellar Dust (ISD) in-situ in the Solar System between 1992 and 2007. Here we present the first comprehensive analysis of the ISD component in the entire Ulysses dust data set. We analysed several parameters of the ISD flow in a time-resolved fashion: flux, flow direction, mass index, and flow width. The general picture is in agreement with a time-dependent focussing/defocussing of the charged dust particles due to long-term variations of the solar magnetic field throughout a solar magnetic cycle of 22 years. In addition, we confirm a shift in dust direction of $50^{\circ }\pm 7^{\circ }$ in 2005, along with a steep, size-dependent increase in flux by a factor of 4 within 8 months. To date, this is difficult to interpret and has to be examined in more detail by new dynamical simulations. This work is part of a series of three papers. This paper concentrates on the time-dependent flux and direction of the ISD. In a companion paper (Krüger et al., 2015) we analyse the overall mass distribution of the ISD measured by Ulysses, and a third paper discusses the results of modelling the flow of the ISD as seen by Ulysses (Sterken et al., 2015).

41 pages, 10 figures, 5 tables

References in corpus (4)

• The Boundary Conditions of the Heliosphere: Photoionization Models Constrained by Interstellar and In Situ Data
• Revisiting Ulysses Observations of Interstellar Helium
• Interstellar Dust in the Solar System
• 16 Years of Ulysses Interstellar Dust Measurements in the Solar System: I. Mass Distribution and Gas-to-Dust Mass Ratio

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• 16 Years of Ulysses Interstellar Dust Measurements in the Solar System: I. Mass Distribution and Gas-to-Dust Mass Ratio
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• The Dawn of Dust Astronomy
• Interstellar Extinction
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• Effects of dispersion of the dust velocity in the LISM on the interstellar dust distribution inside the heliosphere
• Dynamical charging of interstellar dust particles in the heliosphere
• Synergies between interstellar dust and heliospheric science with an Interstellar Probe
• A solar rotation signature in cosmic dust: frequency analysis of dust particle impacts on the Wind spacecraft
• What is the amount of baryonic dark matter in galaxies?