5k citations · 6.1k across the 29 of their papers we have counts for
30 papers
Slow Solar Wind Connection Science during Solar Orbiter's First Close Perihelion Passage
Stephanie L. Yardley, Christopher J. Owen, David M. Long +76
The Slow Solar Wind Connection Solar Orbiter Observing Plan (Slow Wind SOOP) was developed to utilise the extensive suite of remote sensing and in situ instruments on board the ESA…
The SunPy Project: An Interoperable Ecosystem for Solar Data Analysis
The SunPy Community, Will Barnes, Steven Christe +7
The SunPy Project is a community of scientists and software developers creating an ecosystem of Python packages for solar physics. The project includes the sunpy core package as we…
Understanding the Relationship between Solar Coronal Abundances and F10.7 cm Radio Emission
Andy S. H. To, Alexander W. James, T. S. Bastian +7
Sun-as-a-star coronal plasma composition, derived from full-Sun spectra, and the F10.7 radio flux (2.8 GHz) have been shown to be highly correlated (r = 0.88) during solar cycle 24…
The magnetic field environment of active region 12673 that produced the energetic particle events of September 2017
Stephanie L. Yardley, Lucie M. Green, Alexander W. James +2
Forecasting solar energetic particles (SEPs), and identifying flare/CMEs from active regions (ARs) that will produce SEP events in advance is extremely challenging. We investigate…
The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package
The Astropy Collaboration, Adrian M. Price-Whelan, Pey Lian Lim +133
The Astropy Project supports and fosters the development of open-source and openly-developed Python packages that provide commonly needed functionality to the astronomical communit…
Radial evolution of thermal and suprathermal electron populations in the slow solar wind from 0.13 to 0.5 au : Parker Solar Probe Observations
Joel B. Abraham, Christopher J Owen, Daniel Verscharen +8
We develop and apply a bespoke fitting routine to a large volume of solar wind electron distribution data measured by Parker Solar Probe (PSP) over its first five orbits, covering…
The Stability of the Electron Strahl against the Oblique Fast-magnetosonic/Whistler Instability in the Inner Heliosphere
Seong-Yeop Jeong, Joel B. Abraham, Daniel Verscharen +8
We analyze the micro-kinetic stability of the electron strahl in the solar wind depending on heliocentric distance. The oblique fast-magnetosonic/whistler (FM/W) instability has em…
Test Problems for Potential Field Source Surface Extrapolations of Solar and Stellar Magnetic Fields
David Stansby, Daniel Verscharen
The potential field source surface (PFSS) equations are commonly used to model the coronal magnetic field of the Sun and other stars. As with any computational model, solving equat…
The Kinetic Expansion of Solar-Wind Electrons: Transport Theory and Predictions for the very Inner Heliosphere
Seong-Yeop Jeong, Daniel Verscharen, Christian Vocks +9
We propose a transport theory for the kinetic evolution of solar-wind electrons in the heliosphere. We derive a gyro-averaged kinetic transport equation that accounts for the spher…
Disambiguation of Vector Magnetograms by Stereoscopic Observations from the Solar Orbiter/Polarimetric and Helioseismic Imager (PHI) and the Solar Dynamic Observatory (SDO)/Helioseismic and Magnetic Imager (HMI)
Gherardo Valori, Philipp Löschel, David Stansby +3
Spectropolarimetric reconstructions of the photospheric vector magnetic field are intrinsically limited by the so-called 180 ambiguity in the orientation of the transverse…
Magnetic reconnection as a mechanism to produce multiple protonpopulations and beams locally in the solar wind
B. Lavraud, R. Kieokaew, N. Fargette +37
Context. Spacecraft observations early revealed frequent multiple proton populations in the solar wind. Decades of research on their origin have focused on processes such as magnet…
The solar-wind angular-momentum flux observed during Solar Orbiter's first orbit
Daniel Verscharen, David Stansby, Adam J. Finley +19
Aims: We present the first measurements of the solar-wind angular-momentum (AM) flux recorded by the Solar Orbiter spacecraft. Our aim is the validation of these measurements to su…
Active region contributions to the solar wind over multiple solar cycles
D. Stansby, L. M. Green, L. van Driel-Gesztelyi +1
Both coronal holes and active regions are source regions of the solar wind. The distribution of these coronal structures across both space and time is well known, but it is unclear…
Alfvenic Perturbations in a Sunspot Chromosphere Linked to Fractionated Plasma in the Corona
D. Baker, M. Stangalini, G. Valori +7
In this study, we investigate the spatial distribution of highly varying plasma composition around one of the largest sunspots of solar cycle 24. Observations of the photosphere, c…
Enhanced proton parallel temperature inside patches of switchbacks in the inner heliosphere
L. D. Woodham, T. S. Horbury, L. Matteini +16
Switchbacks are discrete angular deflections in the solar wind magnetic field that have been observed throughout the heliosphere. Recent observations by Parker Solar Probe (PSP) ha…
The Solar Orbiter Science Activity Plan: translating solar and heliospheric physics questions into action
I. Zouganelis, A. De Groof, A. P. Walsh +182
Solar Orbiter is the first space mission observing the solar plasma both in situ and remotely, from a close distance, in and out of the ecliptic. The ultimate goal is to understand…
Prediction of the in situ coronal mass ejection rate for solar cycle 25: Implications for Parker Solar Probe in situ observations
Christian Möstl, Andreas J. Weiss, Rachel L. Bailey +7
The Parker Solar Probe (PSP) and Solar Orbiter missions are designed to make groundbreaking observations of the Sun and interplanetary space within this decade. We show that a part…
Directly comparing coronal and solar wind elemental fractionation
D. Stansby, D. Baker, D. H. Brooks +1
As the solar wind propagates through the heliosphere, dynamical processes irreversibly erase the signatures of the near-Sun heating and acceleration processes. The elemental fracti…
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…
Linear Stability in the Inner Heliosphere: Helios Reëvaluated
Kristopher G. Klein, Mihailo Martinovic, David Stansby +1
Wave-particle instabilities driven by departures from local thermodynamic equilibrium have been conjectured to play a role in governing solar wind dynamics. We calculate the statis…
The rotation angle distribution underlying magnetic field fluctuations in the 1/f range of solar wind turbulent spectra
L. Matteini, D. Stansby, T. S. Horbury +1
We discuss properties of large amplitude magnetic field fluctuations during fast Alfvenic solar wind streams, focussing on the statistics of the rotation angle between consecutive…
The origin of slow Alfvénic solar wind at solar minimum
D. Stansby, L. Matteini, T. S. Horbury +3
Although the origins of slow solar wind are unclear, there is increasing evidence that at least some of it is released in a steady state on over-expanded coronal hole magnetic fiel…
Snakes on a Spaceship - An Overview of Python in Heliophysics
A. G. Burrell, A. Halford, J. Klenzing +7
Computational analysis has become ubiquitous within the heliophysics community. However, community standards for peer-review of codes and analysis have lagged behind these developm…
On the 1/f spectrum in the solar wind and its connection with magnetic compressibility
Lorenzo Matteini, David Stansby, Timothy Horbury +1
We discuss properties of Alfvénic fluctuations with large amplitude in plasmas characterised by low magnetic field compression. We note that in such systems power laws can not deve…