D. Malaspina
A5063706319- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Astro and Planetary Science
- Geomagnetism and Paleomagnetism Studies
- Earthquake Detection and Analysis
- Planetary Science and Exploration
- Stellar, planetary, and galactic studies
- Solar Radiation and Photovoltaics
- Magnetic confinement fusion research
- Geophysics and Gravity Measurements
- Space Satellite Systems and Control
- Spacecraft Design and Technology
- GNSS positioning and interference
- Atmospheric Ozone and Climate
- Plasma Diagnostics and Applications
- Transportation Safety and Impact Analysis
- Lightning and Electromagnetic Phenomena
- Astrophysics and Star Formation Studies
- Electromagnetic Compatibility and Measurements
- Seismic Waves and Analysis
- Laser-induced spectroscopy and plasma
- Space Science and Extraterrestrial Life
- Space exploration and regulation
- Gamma-ray bursts and supernovae
- Photovoltaic System Optimization Techniques
University of Colorado Boulder
2016-2025
Laboratory for Atmospheric and Space Physics
2016-2025
University of Colorado System
2014-2024
Planetary Science Institute
2022-2023
Los Alamos National Laboratory
2022-2023
University of Iowa
2023
Nagoya University
2023
Memorial University of Newfoundland
2023
Marshall Space Flight Center
2023
Goddard Space Flight Center
2023
The Axial Double Probe (ADP) instrument measures the DC to ∼100 kHz electric field along spin axis of Magnetospheric Multiscale (MMS) spacecraft (Burch et al., Space Sci. Rev., 2014, this issue), completing vector when combined with plane double probes (SDP) (Torbert issue, Lindqvist issue). Two cylindrical sensors are separated by over 30 m tip-to-tip, longest baseline on an axial ever attempted in space. ADP each consists two identical, 12.67 graphite coilable booms second, smaller 2.25...
The first two orbits of the Parker Solar Probe (PSP) spacecraft have enabled in situ measurements solar wind down to a heliocentric distance 0.17 au (or 36 Rs). Here, we present an analysis this data study turbulence at and its evolution out 1 au. While many features remain similar, key differences include: increased energy levels by more than order magnitude, magnetic field spectral index -3/2 matching that velocity both Elsasser fields, lower compressibility consistent with smaller...
One of the most striking observations made by Parker Solar Probe during its first solar encounter is omnipresence rapid polarity reversals in a magnetic field that otherwise mostly radial. These so-called switchbacks strongly affect dynamics field. We concentrate here on their macroscopic properties. First, we find these structures are self-similar, and have neither characteristic magnitude, nor duration. Their waiting time statistics shows evidence for aggregation. The associated long...
Abstract Launched on 12 Aug. 2018, NASA’s Parker Solar Probe had completed 13 of its scheduled 24 orbits around the Sun by Nov. 2022. The mission’s primary science goal is to determine structure and dynamics Sun’s coronal magnetic field, understand how solar corona wind are heated accelerated, what processes accelerate energetic particles. returned a treasure trove data that far exceeded quality, significance, quantity expectations, leading significant number discoveries reported in nearly...
Abstract The dual‐spacecraft Van Allen Probes mission has provided a new window into mega electron volt (MeV) particle dynamics in the Earth's radiation belts. Observations (up to E ~10 MeV) show clearly behavior of outer belt at different timescales: months‐long periods gradual inward radial diffusive transport and weak loss being punctuated by dramatic flux changes driven strong solar wind transient events. We present analysis multi‐MeV phase space density (PSD) during March 2013 context...
Heat transport in the solar corona and wind is still a major unsolved astrophysical problem. Because of key role played by electrons, electron density temperature(s) are important prerequisites for understanding these plasmas. We present such situ measurements along two first encounters Parker Solar Probe (PSP), between 0.5 0.17 AU from Sun, revealing different states emerging near activity minimum. These preliminary results obtained simplified analysis plasma quasi-thermal noise (QTN)...
The Solar Wind Electrons Alphas and Protons experiment on the Parker Probe (PSP) mission measures three-dimensional electron velocity distribution function. We derive parameters of core, halo, strahl populations utilizing a combination fitting to model distributions numerical integration for $\sim 100,000$ measured near Sun first two PSP orbits, which reached heliocentric distances as small 0.17$ AU. As expected, core density temperature increase with decreasing distance, while ratio thermal...
Abstract Measurements of the near-Sun solar wind by Parker Solar Probe have revealed presence large numbers discrete Alfvénic impulses with an anti-sunward sense propagation. These are similar to those previously observed near 1 au, in high speed streams over Sun’s poles and at 60 radii. At 35 radii, however, they typically shorter sharper than seen elsewhere. In addition, these spikes occur “patches” there also clear periods within same stream when do not occur; timescale patches might be...
Abstract Parker Solar Probe ( PSP ) observations during its first encounter at 35.7 R ⊙ have shown the presence of magnetic field lines that are strongly perturbed to point they produce local inversions radial field, known as switchbacks. Their counterparts in solar wind velocity enhancements speed, or jets, displaying (in all components) velocity–magnetic correlation typical large amplitude Alfvén waves propagating away from Sun. Switchbacks and jets previously been observed over a wide...
Abstract In this work, Van Allen Probes data are used to derive terrestrial plasmaspheric hiss wave power distributions organized by (1) distance away from the plasmapause and (2) Earth. This approach is in contrast traditional organization of L parameter geomagnetic activity. Plasmapause‐sorting reveals previously unreported highly repeatable features distribution, including a regular spatial distribution with respect plasmapause, standoff between peak frequency‐dependent localization hiss....
Abstract Spatial and high‐time‐resolution properties of the velocities, magnetic field, 3‐D electric field within plasma turbulence are examined observationally using data from Magnetospheric Multiscale mission. Observations a Kelvin‐Helmholtz instability (KHI) on Earth's magnetopause examined, which both provides series repeatable intervals to analyze, giving better statistics, first look at in KHI. For time direct observations high‐frequency ion electron velocity spectra showing differing...
Abstract Switchbacks (rotations of the magnetic field) are observed on Parker Solar Probe . Their evolution, content, and plasma effects studied in this paper. The solar wind does not receive a net acceleration from switchbacks that it encountered upstream observation point. typical switchback rotation angle increased with radial distance. Significant Poynting fluxes existed inside, but outside, switchbacks, dependence flux amplitude location is explained quantitatively as being proportional...
Understanding the physical processes in solar wind and corona which actively contribute to heating, acceleration, dissipation is a primary objective of NASA's Parker Solar Probe (PSP) mission. Observations coherent electromagnetic waves at ion scales suggests that linear cyclotron resonance non-linear are dynamically relevant inner heliosphere. A wavelet-based statistical study first perihelion encounter PSP demonstrates presence transverse resonant observed 30-50\% radial field intervals....
Magnetic reconnection in current sheets converts magnetic energy into particle energy. The process may play an important role the acceleration and heating of solar wind close to Sun. Observations from Parker Solar Probe provide a new opportunity study this problem, as it measures at unprecedented distances During 1st orbit, PSP encountered large number through perihelion 35.7 radii. We performed comprehensive survey these found evidence for 21 exhausts. These exhausts were observed...
We report observations from the Magnetospheric Multiscale (MMS) satellites of a large guide field magnetic reconnection event. The suggest that two four MMS spacecraft sampled electron diffusion region, whereas other detected exhaust jet amplitude is approximately 4 times reconnecting field. event accompanied by significant parallel electric (E_{∥}) larger than predicted simulations. high-speed (∼300 km/s) crossing region limited data set to one complete distribution inside which shows...
Abstract During Parker Solar Probe ’s first orbit, the solar wind plasma was observed in situ closer than ever before, perihelion on 2018 November 6 revealing a flow that is constantly permeated by large-amplitude Alfvénic fluctuations. These include radial magnetic field reversals, or switchbacks, seem to be persistent feature of young wind. The measurements also reveal very strong, unexpected, azimuthal velocity component. In this work, we numerically model corona during encounter, solving...
Abstract Parker Solar Probe (PSP), NASA’s latest and closest mission to the Sun, is on a journey investigate fundamental enigmas of inner heliosphere. This paper reports initial observations made by Analyzer for Ions (SPAN-I), one instruments in Wind Electrons Alphas Protons instrument suite. We address presence secondary proton beams concert with ion-scale waves observed FIELDS, electromagnetic fields show two events from PSP’s second orbit that demonstrate signatures consistent...
We consider 2D joint distributions of normalized residual energy, σr(s, t), and cross helicity, σc(s, during one day Parker Solar Probe's (PSP's) first encounter as a function wavelet scale s. The broad features the are similar to previous observations made by Helios in slow solar wind, namely well-correlated fairly Alfvénic except for population with negative helicity that is seen at shorter scales. show this due presence magnetic switchbacks, or brief periods where field polarity reverses....
Direct evidence of an inertial-range turbulent energy cascade has been provided by spacecraft observations in heliospheric plasmas. In the solar wind, average value derived heating rate near 1 au is $\sim 10^{3}\, \mathrm{J\,kg^{-1}\,s^{-1}}$, amount sufficient to account for observed departures from adiabatic expansion. Parker Solar Probe (PSP), even during its first encounter, offers opportunity compute, a similar fashion, fluid-scale decay rate, much closer corona than any prior in-situ...
We discuss the solar wind electron temperatures Te as measured in nascent by Parker Solar Probe during its first perihelion pass. The measurements have been obtained fitting high-frequency part of quasi-thermal noise spectra recorded Radio Frequency Spectrometer. In addition we compare these with those electrostatic analyzer discussed Halekas et al. These observations show an anticorrelation between and bulk speed V: this is most likely remnant well-known mapping observed at 1 au beyond fast...
Abstract The first radial alignment between Parker Solar Probe and Orbiter spacecraft is used to investigate the evolution of solar wind turbulence in inner heliosphere. Assuming ballistic propagation, two 1.5 hr intervals are tentatively identified as providing measurements same plasma parcels traveling from 0.1 1 au. Using magnetic field both spacecraft, properties assessed. Magnetic spectral density, flatness, high-order moment scaling laws calculated. Hilbert–Huang transform additionally...