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norskBlar i forfatter "Nouzak, Libor"
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A comparison of contact charging and impact ionization in low-velocity impacts: implications for dust detection in space
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-06-15)We investigate the generation of charge due to collision between projectiles with sizes below ∼1 µm and metal surfaces at speeds ∼0.1 to 10 km s−1. This corresponds to speeds above the elastic limit and well below speeds where volume ionization can occur. Impact charge production at these low to intermediate speeds has traditionally been described by invoking the theory of shock wave ionization. By ... -
Dust observations with antenna measurements and its prospects for observations with Parker Solar Probe and Solar Orbiter
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019-12-10)The electric and magnetic field instrument suite FIELDS on board the NASA Parker Solar Probe and the radio and plasma waves instrument RPW on the ESA Solar Orbiter mission that explore the inner heliosphere are sensitive to signals generated by dust impacts. Dust impacts have been observed using electric field antennas on spacecraft since the 1980s and the method was recently used with a number of ... -
Ion Cloud Expansion after Hypervelocity Dust Impacts Detected by the MMS Electric Probes in the Dipole Configuration
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-11-08)Dust impact detection by electric field instruments is a well-established technique. On the other hand, not all aspects of signal generation by dust impacts are completely understood. We present a study of events related to dust impacts on the spacecraft body detected by electric field probes operating simultaneously in the monopole (probe-to-spacecraft potential measurement) and dipole (probe-to-probe ... -
Machine Learning Detection of Dust Impact Signals Observed by The Solar Orbiter
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-08-11)This article present results from automatic detection of dust impact signals observed by the Solar Orbiter – Radio and Plasma Waves instrument.<p> <p>A sharp and characteristic electric field signal is observed by the Radio and Plasma Waves instrument when a dust particle impact the spacecraft at high velocity. In this way, ∼5–20 dust impacts are daily detected as the Solar Orbiter travels through ... -
One-Year Analysis of Dust Impact-Like Events Onto the MMS Spacecraft
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019-10-16)We present an analysis of 1‐year data of dust impacts observed on two of the Earth‐orbiting Magnetospheric Multiscale mission (MMS) spacecraft. The dust impact signals were identified in observations of the electric field probes and were registered simultaneously by monopole and dipole configurations of the instrument. This unique setup allows us to reliably identify changes in the spacecraft potential ... -
Understanding Cassini RPWS Antenna Signals Triggered by Dust Impacts
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019-09-04)Electric field antennas are capable of detecting dust impacts in different space environment. We analyze the dust impact signals detected by the Cassini Radio and Plasma Wave Science instrument at different locations around Saturn and compare them with dust impact signals simulated in laboratory conditions and numerically. The spacecraft potential, the size, and capacitance of the impacted element ... -
Understanding Cassini RPWS Antenna Signals Triggered by Dust Impacts
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019-09-04)Electric field antennas are capable of detecting dust impacts in different space environment. We analyze the dust impact signals detected by the Cassini Radio and Plasma Wave Science instrument at different locations around Saturn and compare them with dust impact signals simulated in laboratory conditions and numerically. The spacecraft potential, the size, and capacitance of the impacted element ...
