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Found 6 entries in the Bibliography.
Showing entries from 1 through 6
A statistical evaluation of ballistic backmapping for the slow solar wind: The interplay of solar wind acceleration and corotation
Mapping solar wind plasma back to its source is often achieved using the two-step ballistic backmapping method. Solar wind observations are mapped through the heliosphere to the edge of a PFSS model, by assuming a constant speed, radial, plasma flow. Tracing field lines through the model gives the source location at 1 R$_\ensuremath\odot$ The heliospheric mapping component hinges upon the argument that two known sources of error, stemming from solar wind acceleration and non-radial flow, effectively cancel. This assumption ...
Macneil, Allan; Owens, Mathew; Finley, Adam; Matt, Sean;
Published by: \mnras Published on: oct
YEAR: 2021   DOI: 10.1093/mnras/stab2965
Evolving solar wind flow properties of magnetic inversions observed by Helios
Macneil, Allan; Owens, Mathew; Wicks, Robert; Lockwood, Mike;
Published by: \mnras Published on: 03/2021
YEAR: 2021   DOI: 10.1093/mnras/staa3983
Sun: heliosphere; Sun: magnetic fields; Solar wind; Astrophysics - Solar and Stellar Astrophysics; Physics - Space Physics
Parker Solar Probe observations of suprathermal electron flux enhancements originating from Coronal Hole boundaries
Reconnection between pairs of solar magnetic flux elements, one open and the other a closed loop, is theorized to be a crucial process for both maintaining the structure of the corona and producing the solar wind. This interchange reconnection is expected to be particularly active at the open-closed boundaries of coronal holes (CHs). Previous analysis of solar wind data at 1 au indicated that peaks in the flux of suprathermal electrons at slow-fast stream interfaces may arise from magnetic connection to the CH boundary, ra ...
Macneil, Allan; Owens, Mathew; Bercic, Laura; Finley, Adam;
Published by: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY Published on: 11/2020
YEAR: 2020   DOI: 10.1093/mnras/staa2660
The evolution of inverted magnetic fields through the inner heliosphereABSTRACT
Local inversions are often observed in the heliospheric magnetic field (HMF), but their origins and evolution are not yet fully understood. Parker Solar Probe has recently observed rapid, Alfv\ enic, HMF inversions in the inner heliosphere, known as \textquoterightswitchbacks\textquoteright, which have been interpreted as the possible remnants of coronal jets. It has also been suggested that inverted HMF may be produced by near-Sun interchange reconnection; a key process in mechanisms proposed for slow solar wind release. ...
Macneil, Allan; Owens, Mathew; Wicks, Robert; Lockwood, Mike; Bentley, Sarah; Lang, Matthew;
Published by: Monthly Notices of the Royal Astronomical Society Published on: 04/2020
YEAR: 2020   DOI: 10.1093/mnras/staa951
Astrophysics - Solar and Stellar Astrophysics; magnetic fields; parker solar probe; Physics - Space Physics; plasmas; Solar Probe Plus; Solar wind; Sun: heliosphere
On the Origin of Ortho-Gardenhose Heliospheric Flux
Parker-spiral theory predicts that the heliospheric magnetic field (HMF) will have components of opposite polarity radially toward the Sun and tangentially antiparallel to the solar rotation direction (i.e., in Geocentric Solar Ecliptic (GSE) coordinates, with BX/BY<0). This theory explains the average orientation of the HMF very well indeed but does not predict the so-called ortho-gardenhose (hereafter OGH) flux with which is frequently observed. We here study the occurrence and structure of OGH flux, as seen in near-Earth ...
Lockwood, Mike; Owens, Mathew; Macneil, Allan;
Published by: SOLAR PHYSICS Published on: 06/2019
YEAR: 2019   DOI: 10.1007/s11207-019-1478-7
Generation of Inverted Heliospheric Magnetic Flux by Coronal Loop Opening and Slow Solar Wind Release
In situ spacecraft observations provide much-needed constraints on theories of solar wind formation and release, particularly the highly variable slow solar wind, which dominates near-Earth space. Previous studies have shown an association between local inversions in the heliospheric magnetic field (HMF) and solar wind released from the vicinity of magnetically closed coronal structures. We here show that in situ properties of inverted HMF are consistent with the same hot coronal source regions as the slow solar wind. We ...
Owens, Mathew; Lockwood, Mike; Barnard, Luke; Macneil, Allan;
Published by: The Astrophysical Journal Published on: 11/2018
YEAR: 2018   DOI: 10.3847/2041-8213/aaee82
parker solar probe; Solar Probe Plus; Solar wind; Sun: activity; Sun: corona; Sun: magnetic fields