Outputs (76)

Estimating the Rate of Field Line Braiding in the Solar Corona by Photospheric Flows (2018)
Journal Article
Candelaresi, S., Pontin, D., Yeates, A., Bushby, P., & Hornig, G. (2018). Estimating the Rate of Field Line Braiding in the Solar Corona by Photospheric Flows. Astrophysical Journal, 864(2), Article 157. https://doi.org/10.3847/1538-4357/aad8bc

In this paper, we seek to understand the timescale in which the photospheric motions on the Sun braid coronal magnetic field lines. This is a crucial ingredient for determining the viability of the braiding mechanism for explaining the high temperatu... Read More about Estimating the Rate of Field Line Braiding in the Solar Corona by Photospheric Flows.

Global Non-Potential Magnetic Models of the Solar Corona During the March 2015 Eclipse (2018)
Journal Article
Yeates, A., Amari, T., Contopoulos, I., Feng, X., Mackay, D., Mikic, Z., …Torok, T. (2018). Global Non-Potential Magnetic Models of the Solar Corona During the March 2015 Eclipse. Space Science Reviews, 214, Article 99. https://doi.org/10.1007/s11214-018-0534-1

Seven different models are applied to the same problem of simulating the Sun’s coronal magnetic field during the solar eclipse on 2015 March 20. All of the models are non-potential, allowing for free magnetic energy, but the associated electric curre... Read More about Global Non-Potential Magnetic Models of the Solar Corona During the March 2015 Eclipse.

Quantifying reconnective activity in braided vector fields (2018)
Journal Article
Prior, C., & Yeates, A. (2018). Quantifying reconnective activity in braided vector fields. Physical Review E, 98(1), Article 013204. https://doi.org/10.1103/physreve.98.013204

We introduce a technique for evaluating the changing connectivity of a vector field whose integral curves (field lines) form tangled tubular bundles. Applications of such fields include magnetic flux ropes, relativistic plasma jets, stirred two-dimen... Read More about Quantifying reconnective activity in braided vector fields.

A new technique for observationally derived boundary conditions for space weather (2018)
Journal Article
Pagano, P., Mackay, D. H., & Yeates, A. R. (2018). A new technique for observationally derived boundary conditions for space weather. Journal of Space Weather and Space Climate, 8, Article A26. https://doi.org/10.1051/swsc/2018012

Context. In recent years, space weather research has focused on developing modelling techniques to predict the arrival time and properties of coronal mass ejections (CMEs) at the Earth. The aim of this paper is to propose a new modelling technique su... Read More about A new technique for observationally derived boundary conditions for space weather.

The Large-scale Coronal Structure of the 2017 August 21 Great American Eclipse: An Assessment of Solar Surface Flux Transport Model Enabled Predictions and Observations (2018)
Journal Article
Nandy, D., Bhowmik, P., Yeates, A. R., Panda, S., Tarafder, R., & Dash, S. (2018). The Large-scale Coronal Structure of the 2017 August 21 Great American Eclipse: An Assessment of Solar Surface Flux Transport Model Enabled Predictions and Observations. Astrophysical Journal, 853(1), Article 72. https://doi.org/10.3847/1538-4357/aaa1eb

On 2017 August 21, a total solar eclipse swept across the contiguous United States, providing excellent opportunities for diagnostics of the Sun's corona. The Sun's coronal structure is notoriously difficult to observe except during solar eclipses; t... Read More about The Large-scale Coronal Structure of the 2017 August 21 Great American Eclipse: An Assessment of Solar Surface Flux Transport Model Enabled Predictions and Observations.

Parameter optimization for surface flux transport models (2017)
Journal Article
Whitbread, T., Yeates, A., Muñoz-Jaramillo, A., & Petrie, G. (2017). Parameter optimization for surface flux transport models. Astronomy & Astrophysics, 607, Article A76. https://doi.org/10.1051/0004-6361/201730689

Accurate prediction of solar activity calls for precise calibration of solar cycle models. Consequently we aim to find optimal parameters for models which describe the physical processes on the solar surface, which in turn act as proxies for what occ... Read More about Parameter optimization for surface flux transport models.

The Open Flux Problem (2017)
Journal Article
Linker, J., Caplan, R., Downs, C., Riley, P., Mikic, Z., Lionello, R., …Owens, M. (2017). The Open Flux Problem. Astrophysical Journal, 848(1), Article 70. https://doi.org/10.3847/1538-4357/aa8a70

The heliospheric magnetic field is of pivotal importance in solar and space physics. The field is rooted in the Sun's photosphere, where it has been observed for many years. Global maps of the solar magnetic field based on full-disk magnetograms are... Read More about The Open Flux Problem.

Magnetic Flux Rope Identification and Characterization from Observationally Driven Solar Coronal Models (2017)
Journal Article
Lowder, C., & Yeates, A. (2017). Magnetic Flux Rope Identification and Characterization from Observationally Driven Solar Coronal Models. Astrophysical Journal, 846(2), Article 106. https://doi.org/10.3847/1538-4357/aa86b1

Formed through magnetic field shearing and reconnection in the solar corona, magnetic flux ropes are structures of twisted magnetic field, threaded along an axis. Their evolution and potential eruption are of great importance for space weather. Here... Read More about Magnetic Flux Rope Identification and Characterization from Observationally Driven Solar Coronal Models.

Reconstructing solar magnetic fields from historical observations (2017)
Journal Article
Virtanen, I., Virtanen, I., Pevtsov, A., Yeates, A., & Mursula, K. (2017). Reconstructing solar magnetic fields from historical observations. Astronomy & Astrophysics, 604, Article A8. https://doi.org/10.1051/0004-6361/201730415

Aims. We aim to use the surface flux transport model to simulate the long-term evolution of the photospheric magnetic field from historical observations. In this work we study the accuracy of the model and its sensitivity to uncertainties in its main... Read More about Reconstructing solar magnetic fields from historical observations.

Sparse reconstruction of electric fields from radial magnetic data (2017)
Journal Article
Yeates, A. (2017). Sparse reconstruction of electric fields from radial magnetic data. Astrophysical Journal, 836(1), Article 131. https://doi.org/10.3847/1538-4357/aa5c84

Accurate estimates of the horizontal electric field on the Sun's visible surface are important not only for estimating the Poynting flux of magnetic energy into the corona but also for driving time-dependent magnetohydrodynamic models of the corona.... Read More about Sparse reconstruction of electric fields from radial magnetic data.