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Chloe Pugh

Position: PhD Student

Supervisors: Prof Valery Nakariakov, Dr Anne-Marie Broomhall

Topic: Quasi-Periodic Pulsations in Solar and Stellar Flares

Funding: ERC

Background: Master of Physics (MPhys), University of Warwick, 2014

Publications

Properties of quasi-periodic pulsations in solar flares from a single active region
Pugh, C. E., Nakariakov, V. M., Broomhall, A.-M., Bogomolov, A. V., Myagkova, I. N. 2017, Astronomy & Astrophysics, [accepted September 2017]

Significance testing for quasi-periodic pulsations in solar and stellar flares

Pugh, C. E., Broomhall, A.-M., Nakariakov, V. M. 2017, Astronomy & Astrophysics, 602, A47

Statistical Properties of Quasi-Periodic Pulsations in White-Light Flares Observed With Kepler

Pugh, C. E., Armstrong, D. J., Nakariakov, V. M., Broomhall, A.-M. 2016, MNRAS, 459, 3659

The Host Stars of Kepler's Habitable Exoplanets: Superflares, Rotation and Activity

Armstrong, D. J., Pugh, C. E., Broomhall, A.-M., Brown, D. J. A., Lund, M. N., Osborn, H. P., Pollacco, D. L. 2016, MNRAS, 455, 3110

A Multi-Period Oscillation in a Stellar Superflare

Pugh, C. E., Nakariakov, V. M., Broomhall, A.-M. 2015, The Astrophysical Journal Letters, 813, L5

Solar cycle variations in the powers and damping rates of low-degree solar acoustic oscillations
Broomhall, A.-M., Pugh, C. E., Nakariakov, V. M. 2015, Advances in Space Research, 56, 2706

Oscillations in Stellar Superflares
Balona, L. A, Broomhall, A.-M., Kosovichev, A. Nakariakov, V. M., Pugh, C. E., Van Doorsselaere, T. 2015, MNRAS, 450, 956

About my research

Many stars not dissimilar from the Sun have been observed to produce flares several orders of magnitude greater than any solar flare on record. Due to the potential for substantial damage in the near-Earth environment associated with powerful flares, it is important to work towards determining whether a superflare could ever occur on the Sun.

One way to help with this is the study of quasi-periodic pulsations (QPPs), which are time variations in the intensity of light emitted by a flare. Several possible mechanisms that could be responsible for the QPPs have been proposed, which fall into two categories: magnetohydrodynamic (MHD) oscillations, or self-oscillatory regimes of spontaneous magnetic reconnection. QPPs in solar flares have been widely observed, and can be used as a coronal plasma diagnostics tool. More recently, QPPs have been observed in flares on other stars, although these observations are more rare.

I am currently using data from NASA's Kepler mission to expand the sample size of known stellar QPPs, identify their periods of oscillation, and ultimately work towards modelling the flares and deducing the physical parameters of the flaring regions.

With a large sample of QPPs in stellar flares, it might be possible to infer whether the underlying physics of stellar superflares is similar to that of solar flares, and thus provide evidence as to whether a superflare could occur on the Sun.

Total solar eclipse

Photo taken during the total solar eclipse on 21st August 2017 in Tennessee. The pink/purple glow is from the solar chromosphere.

photo

Contact Details

Email:

c dot e dot pugh at warwick dot ac dot uk

Office:

PS1.07