A5002838272- Solar and Space Plasma Dynamics
- Astro and Planetary Science
- Planetary Science and Exploration
- Ionosphere and magnetosphere dynamics
- Astrophysics and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Space Science and Extraterrestrial Life
- Geophysics and Gravity Measurements
- Spacecraft Design and Technology
- Earthquake Detection and Analysis
- Atmospheric aerosols and clouds
- Space exploration and regulation
- Space Satellite Systems and Control
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Geomagnetism and Paleomagnetism Studies
- Geology and Paleoclimatology Research
- Gamma-ray bursts and supernovae
University of California, Berkeley
2020-2025
Abstract Parker Solar Probe ’s ( PSP ’s) FIELDS instrument provides a measure of the dust impact rate on spacecraft with full-coverage summary voltages recorded by spacecraft’s antennas. From consecutively sampled periods throughout orbit, stores maximum amplitude measured each active antenna. The occurrence during given period can be identified these amplitudes exceeding few tens millivolts, and grain’s location approximated using differential between locations indicated in data are...
Abstract This work examines the variation of interplanetary dust count rates and directionality during first three solar encounters made by Parker Solar Probe spacecraft, covering distances between 0.65 au (∼140 radii, R S ) 0.16 (∼35 ). Dust detections are FIELDS instrument via plasma clouds, produced impact ionization grains on spacecraft surfaces resultant potential perturbations. inferred densities found to vary ∼50% (∼5 months per orbit), with most concentrated below 0.23 (∼50...
The Parker Solar Probe (PSP) spacecraft has flown into the most dense and previously unexplored region of our solar system's zodiacal cloud. While PSP does not have a dedicated dust detector, multiple instruments onboard are sensitive to effects meteoroid bombardment. Here, we discuss measurements taken during PSP's first two orbits compare them models cloud's distribution. Comparing radial impact rate trends timing location an energetic particle find impactor population be consistent with...
Abstract While not specifically designed as a planetary mission, NASA's Parker Solar Probe (PSP) mission uses series of Venus gravity assists (VGAs) in order to reduce its perihelion distance. These orbital maneuvers provide the opportunity for direct measurements plasma environment at high cadence. We present first observations kinetic scale turbulence magnetosheath from two VGAs. In VGA1, PSP observed quasi‐parallel shock, β ∼ 1 plasma, and range scaling k −2.9 . VGA2 was characterized by...
Abstract Parker Solar Probe is the first mission to probe in situ innermost heliosphere, revealing an exceptionally dynamic and structured outer solar corona. Its payload includes a search‐coil magnetometer (SCM) that measures up three components of fluctuating magnetic field between 3 Hz 1 MHz. After more than years operation, SCM has revealed multitude different wave phenomena wind. Here we present overview some discoveries made so far. These include oblique sunward propagating whistler...
Abstract We use observations from the Magnetospheric Multiscale spacecraft to identify a free energy source for high-frequency whistler waves in Earth’s quasi-perpendicular bow shock. In considered measurements, whistlers propagate both parallel and antiparallel background magnetic field B 0 with frequencies around 100 Hz (0.15 f ce , where is electron cyclotron frequency) amplitudes between 0.1 1 nT. Their growth can be attributed localized pitch angle anisotropy velocity distribution...
Context. The opacity of the ionosphere prevents comprehensive Earth-based surveys low frequency ν ≲ 10 MHz astrophysical radio emissions. limited available data in this regime show a downturn mean sky brightness at 3 divergence from synchrotron emission power-law that is observed higher frequencies. turning over spectrum coincides with shift region maximum Galactic plane to poles. This implicates free-free absorption by interstellar ionized gas, whose concentration causes radiation...
We present a Bayesian analysis of data from the FIELDS instrument on board Parker Solar Probe (PSP) spacecraft with aim constraining low frequency ($\lesssim$ 6 MHz) sky in preparation for several upcoming lunar-based experiments. utilize recorded during PSP's ``coning roll'' maneuvers, which axis is pointed 45$^{\circ}$ off Sun. The then rotates about line between Sun and period 24 minutes. reduce into two formats: roll-averaged, spectra are averaged over roll, phase-binned, binned...
When a fast dust particle hits spacecraft, it generates cloud of plasma some which escapes into space and the momentary charge imbalance perturbs spacecraft voltage with respect to plasma. Electrons race ahead ions, however both respond DC electric field spacecraft. If potential is positive plasma, should attract electrons repel vice versa. Here we use measurements impulsive signals from impacts on Parker Solar Probe (PSP) show that peak amplitude clearly related floating potential,...
Earth and Space Science Open Archive This preprint has been submitted to is under consideration at Geophysical Research Letters. ESSOAr a venue for early communication or feedback before peer review. Data may be preliminary.Learn more about preprints preprintOpen AccessYou are viewing the latest version by default [v1]Kinetic-Scale Turbulence in Venusian MagnetosheathAuthorsTrevor ABoweniDStuart D.BaleRiddhiBandyopadhyayiDJohn W.BonnelliDAnthony...
<p>The zodiacal cloud in the inner solar system undergoes continual evolution, as its dust grains are collisionally ground and sublimated into smaller sizes. Sufficiently small (~<500 nm) known beta-meteoroids ejected from on hyperbolic orbits under influence of radiation pressure. These can reach significantly larger speeds than those nominal impact surfaces airless bodies. Since discovery Moon's asymmetric ejecta cloud, origin sunward-canted density enhancement has not...
Earth and Space Science Open Archive This preprint has been submitted to is under consideration at Geophysical Research Letters. ESSOAr a venue for early communication or feedback before peer review. Data may be preliminary.Learn more about preprints preprintOpen AccessYou are viewing the latest version by default [v1]Whistler Waves Venus's Quasi-Parallel Bow ShockAuthorsBrentPageiDTrevor ABoweniDStuart D.BaleJohn W.BonnellAnthony WilliamCaseiDThierryDudok de WitiDKeithGoetziDKatherine...