128 citations · 517 across the 18 of their papers we have counts for
18 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…
SIR-HUXt -- a particle filter data assimilation scheme for assimilating CME time-elongation profiles
Luke Barnard, Mathew Owens, Chris Scott +2
We present the development of SIR-HUXt, the integration of a sequential importance resampling (SIR) data assimilation scheme with the HUXt solar wind model. SIR-HUXt is designed to…
Solar Energetic Particle Ground-Level Enhancements and the Solar Cycle
Mathew Owens, Luke Barnard, Benjamin Pope +3
Severe geomagnetic storms appear to be ordered by the solar cycle in a number of ways. They occur more frequently close to solar maximum and declining phase, are more common in lar…
Evolving Solar Wind Flow Properties of Magnetic Inversions Observed by Helios
Allan R Macneil, Mathew J Owens, Robert T Wicks +1
In its first encounter at solar distances as close as r = 0.16AU, Parker Solar Probe (PSP) observed numerous local reversals, or inversions, in the heliospheric magnetic field (HMF…
Semi-annual, annual and Universal Time variations in the magnetosphere and in geomagnetic activity: 4. Polar Cap motions and origins of the Universal Time effect
Mike Lockwood, Carl Haines, Luke A. Barnard +4
We use the am, an, as and the a-sigma geomagnetic indices to the explore a previously overlooked factor in magnetospheric electrodynamics, namely the inductive effect of diurnal mo…
The Solar Corona during the Total Eclipse on 16 June 1806: Graphical Evidence of the Coronal Structure during the Dalton Minimum
Hisashi Hayakawa, Mathew J. Owens, Michael Lockwood +1
Visible coronal structure, in particular the spatial evolution of coronal streamers, provides indirect information about solar magnetic activity and the underlying solar dynamo. Th…
The Evolution of Inverted Magnetic Fields Through the Inner Heliosphere
Allan Macneil, Mathew Owens, Robert Wicks +3
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…
On the Origin of Otho-Gardenhose Heliospheric Flux
Mike Lockwood, Mat Owens, Allan Macneil
Parker spiral theory predicts the heliospheric magnetic field (HMF) will have components of opposite polarity radially toward the Sun and tangentially antiparallel to the solar rot…
A homogeneous aa index: 2. hemispheric asymmetries and the equinoctial variation
Mike Lockwood, Ivan D. Finch, Aude Chambodut +3
Paper 1 [Lockwood et al., 2018] generated annual means of a new version of the geomagnetic activity index which includes corrections for secular drift in the geographic coordi…
A homogeneous aa index: 1. Secular variation
Mike Lockwood, Aude Chambodut, Luke A. Barnard +3
Originally complied for 1868-1967 and subsequently continued so that it now covers 150 years, the index has become a vital resource for studying space climate change. However,…
Space climate and space weather over the past 400 years: 2. Proxy indicators of geomagnetic storm and substorm
Mike Lockwood, Mathew J. Owens, Luke A. Barnard +3
Using the reconstruction of power input to the magnetosphere given in Paper 1 (arXiv:1708.04904), we reconstruct annual means of geomagnetic indices over the past 400 years to with…
Space Climate and Space Weather over the past 400 years: 1. The Power input to the Magnetosphere
Mike Lockwood, Mathew J. Owens, Luke A. Barnard +2
Using information on geomagnetic activity, sunspot numbers and cosmogenic isotopes, supported by historic eclipse images and in conjunction with models, it has been possible to rec…
Tests of sunspot number sequences: 4. Discontinuities around 1946 in various sunspot number and sunspot group number reconstructions
Mike Lockwood, Mathew J. Owens, Luke A. Barnard
We use 5 test data series to quantify putative discontinuities around 1946 in 5 annual-mean sunspot number or group number sequences. The series tested are: the original and new ve…
Tests of Sunspot Number Sequences: 2. Using Geomagnetic and Auroral Data
Mike Lockwood, Mathew J. Owens, Luke A Barnard +3
We compare four sunspot-number data sequences against geomagnetic and terrestrial auroral observations. The comparisons are made for the original SIDC composite of Wolf-Zurich-Inte…
An Assessment of Sunspot Number Data Composites over 1845-2014
Mike Lockwood, Mathew J. Owens, Luke A. Barnard +1
New sunspot data composites, some of which are radically different in the character of their long-term variation, are evaluated over the interval 1845-2014. The method commonly use…
Tests of Sunspot Number Sequences: 1. Using Ionosonde Data
M. Lockwood, C. J. Scott, M. J. Owens +2
More than 70 years ago it was recognised that ionospheric F2-layer critical frequencies had a strong relationship to sunspot number. Using historic datasets from the Slough…
A New Calibrated Sunspot Group Series Since 1749: Statistics of Active Day Fractions
I. G. Usoskin, G. A. Kovaltsov, M. Lockwood +3
Although the sunspot-number series have existed since the mid-19th century, they are still the subject of intense debate, with the largest uncertainty being related to the "calibra…
The 22-Year Hale Cycle in Cosmic Ray Flux - Evidence for Direct Heliospheric Modulation
Simon R Thomas, Mathew J Owens, Mike Lockwood
The ability to predict times of greater galactic cosmic ray (GCR) fluxes is important for reducing the hazards caused by these particles to satellite communications, aviation, or a…