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New Observations of Solar Wind 1/f Turbulence Spectrum from Parker Solar Probe
Zesen Huang, Nikos Sioulas, Chen Shi +22
The trace magnetic power spectrum in the solar wind is known to be characterized by a double power law at scales much larger than the proton gyro-radius, with flatter spectral expo…
Magnetic field spectral evolution in the inner heliosphere
Nikos Sioulas, Zesen Huang, Chen Shi +23
Parker Solar Probe and Solar Orbiter data are used to investigate the radial evolution of magnetic turbulence between au. The spectrum is studied as…
Patches of magnetic switchbacks and their origins
Chen Shi, Olga Panasenco, Marco Velli +18
Parker Solar Probe (PSP) has shown that the solar wind in the inner heliosphere is characterized by the quasi omni-presence of magnetic switchbacks ("switchback" hereinafter), loca…
Exploring the Solar Wind from its Source on the Corona into the Inner Heliosphere during the First Solar Orbiter - Parker Solar Probe Quadrature
Daniele Telloni, Vincenzo Andretta, Ester Antonucci +68
This Letter addresses the first Solar Orbiter (SO) -- Parker Solar Probe (PSP) quadrature, occurring on January 18, 2021, to investigate the evolution of solar wind from the extend…
Ambipolar electric field and potential in the solar wind estimated from electron velocity distribution functions
Laura Bercic, Milan Maksimovic, Jasper S. Halekas +17
The solar wind escapes from the solar corona and is accelerated, over a short distance, to its terminal velocity. The energy balance associated with this acceleration remains poorl…
Solar wind energy flux observations in the inner heliosphere: First results from Parker Solar Probe
M. Liu, K. Issautier, N. Meyer-Vernet +15
We investigate the solar wind energy flux in the inner heliosphere using 12-day observations around each perihelion of Encounter One (E01), Two (E02), Four (E04), and Five (E05) of…
The Contribution of Alpha Particles to the Solar Wind Angular Momentum Flux in the Inner Heliosphere
Adam J. Finley, Michael D. McManus, Sean P. Matt +14
An accurate assessment of the Sun's angular momentum (AM) loss rate is an independent constraint for models that describe the rotation evolution of Sun-like stars. In-situ measurem…
Detection of small magnetic flux ropes from the third and fourth Parker Solar Probe encounters
L. -L. Zhao, G. P. Zank, Q. Hu +22
We systematically search for magnetic flux rope structures in the solar wind to within the closest distance to the Sun of 0.13 AU, using data from the third and fourth orbits of th…
Measurement of the Open Magnetic Flux in the Inner Heliosphere down to 0.13AU
Samuel T. Badman, Stuart D. Bale, Alexis P. Rouillard +7
(Abridged) Aim: We attempt to determine robust estimates of the heliospheric magnetic flux () using Parker Solar Probe (PSP) data, analyze how susceptible this is to overestim…
Coronal Electron Temperature inferred from the Strahl Electrons in the Inner Heliosphere: Parker Solar Probe and Helios observations
Laura Bercic, Davin Larson, Phyllis Whittlesey +17
The shape of the electron velocity distribution function plays an important role in the dynamics of the solar wind acceleration. Electrons are normally modelled with three componen…
Sunward propagating whistler waves collocated with localized magnetic field holes in the solar wind: Parker Solar Probe observations at 35.7 Sun radii
O. V. Agapitov, T. Dudok de Wit, F. S. Mozer +21
Observations by the Parker Solar Probe mission of the solar wind at about 35.7 solar radii reveal the existence of whistler wave packets with frequencies below 0.1 f/fce (20-80 Hz…
Parker Solar Probe In-Situ Observations of Magnetic Reconnection Exhausts During Encounter 1
T. D. Phan, S. D. Bale, J. P. Eastwood +23
Magnetic reconnection in current sheets converts magnetic energy into particle energy. The process may play an important role in the acceleration and heating of the solar wind clos…
Inner-Heliosphere Signatures of Ion-Scale Dissipation and Nonlinear Interaction
Trevor A. Bowen, Alfred Mallet, Stuart D. Bale +19
We perform a statistical study of the turbulent power spectrum at inertial and kinetic scales observed during the first perihelion encounter of Parker Solar Probe. We find that oft…
Density Fluctuations in the Solar Wind Based on Type III Radio Bursts Observed by Parker Solar Probe
Vratislav Krupar, Adam Szabo, Milan Maksimovic +20
Radio waves are strongly scattered in the solar wind, so that their apparent sources seem to be considerably larger and shifted than the actual ones. Since the scattering depends o…
Relating streamer flows to density and magnetic structures at the Parker Solar Probe
Alexis P. Rouillard, Athanasios Kouloumvakos, Angelos Vourlidas +34
The physical mechanisms that produce the slow solar wind are still highly debated. Parker Solar Probe's (PSP's) second solar encounter provided a new opportunity to relate in situ…
Statistics and Polarization of Type III Radio Bursts Observed in the Inner Heliosphere
Marc Pulupa, Stuart D. Bale, Samuel T. Badman +20
We present initial results from the Radio Frequency Spectrometer (RFS), the high frequency component of the FIELDS experiment on the Parker Solar Probe (PSP). During the first PSP…
Seed Population Pre-Conditioning and Acceleration Observed by Parker Solar Probe
N. A. Schwadron, S. Bale, J. Bonnell +42
A series of solar energetic particle (SEP) events were observed at Parker Solar Probe (PSP) by the Integrated Science Investigation of the Sun (\ISOIS) during the period from April…
Switchbacks in the near-Sun magnetic field: long memory and impact on the turbulence cascade
Thierry Dudok de Wit, Vladimir V. Krasnoselskikh, Stuart D. Bale +14
One of the most striking observations made by Parker Solar Probe during its first solar encounter is the omnipresence of rapid polarity reversals in a magnetic field that is otherw…
The Enhancement of Proton Stochastic Heating in the near-Sun Solar Wind
Mihailo M. Martinović, Kristopher G. Klein, Justin C. Kasper +18
Stochastic heating is a non-linear heating mechanism driven by the violation of magnetic moment invariance due to large-amplitude turbulent fluctuations producing diffusion of ions…
First in-situ Measurements of Electron Density and Temperature from Quasi-Thermal Noise Spectroscopy with Parker Solar Probe/FIELDS
Michel Moncuquet, Nicole Meyer-Vernet, Karine Issautier +10
Heat transport in the solar corona and wind is still a major unsolved astrophysical problem. Because of the key role played by electrons, the electron density and temperature(s) ar…
Ion Scale Electromagnetic Waves in the Inner Heliosphere
Trevor Bowen, Alfred Mallet, Jia Huang +22
Understanding the physical processes in the solar wind and corona which actively contribute to heating, acceleration, and dissipation is a primary objective of NASA's Parker Solar…
The Evolution and Role of Solar Wind Turbulence in the Inner Heliosphere
C. H. K. Chen, S. D. Bale, J. W. Bonnell +21
The first two orbits of the Parker Solar Probe (PSP) spacecraft have enabled the first in situ measurements of the solar wind down to a heliocentric distance of 0.17 au (or 36 Rs).…
Magnetic connectivity of the ecliptic plane within 0.5 AU : PFSS modeling of the first PSP encounter
Samuel T. Badman, Stuart D. Bale, Juan C. Martinez Oliveros +19
We compare magnetic field measurements taken by the FIELDS instrument on Parker Solar Probe (PSP) during its first solar encounter to predictions obtained by Potential Field Source…
Electrons in the Young Solar Wind: First Results from the Parker Solar Probe
J. S. Halekas, P. Whittlesey, D. E. Larson +14
The Solar Wind Electrons Alphas and Protons experiment on the Parker Solar Probe (PSP) mission measures the three-dimensional electron velocity distribution function. We derive the…