Dr Iain G. Hannah

Office Phone: +44 141 330 5182
Office Address: Rm 617, School of Physics & Astronomy, Kelvin Building, University of Glasgow, Glasgow, G12 8QQ, UK
Email:

I am a Senior Lecturer (and former Royal Society University Research Fellow) working in the Astronomy & Astrophysics Group at the School of Physics & Astronomy of the University of Glasgow. A brief c.v. is at the bottom of this page and my university profile is here.

My research is focused on the physical processes behind the emission we observe in solar flares (or explosive bursts) in the Sun's atmosphere. I study this primarily through multi-wavelength observations combined with theory and numerical simulations. I am particularly interested in small active region flares (microflares and smaller) and also quiet sun emission. I have studied these with the solar X-ray telescope RHESSI, and now with the astrophysics X-ray telescope NuSTAR probing the emission from these weak events (pr/news: first observations, full-sun mosaic, quiet Sun observation). My overview of these solar NuSTAR observations is available on GitHub Pages.

Publications:
NASA/ADS || arXiv || enlighten || Researcher ID/Publons || ORCID || Google Scholar Citations
See the expandable lists below: refereed publications || other/conference publications || thesis

I engage in a variety of public outreach activities, especially giving talks (to local astronomy groups, science centres, cafe scientifique, skeptics etc) and I also organised the Glasgow event for the 2015 eclipse. For more info see the A&A group outreach pages.

My code can be found on GitHub, lecture notes on moodle or find me @sciigh.


  1. The high-energy Sun - probing the origins of particle acceleration on our nearest star
    S. A Matthews, H. A. S. Reid, D. Baker, D. S. Bloomfield, P. K. Browning, A. Calcines, G. Del Zanna, R. Erdelyi, L. Fletcher, I. G. Hannah, N. Jeffrey, L. Klein, S. Krucker, E. Kontar, D. M. Long, A. MacKinnon, G. Mann, M. Mathioudakis, R. Milligan, V. M. Nakariakov, M. Pesce-Rollins, A. Y. Shih, D. Smith, A. Veronig & N. Vilmer
    Exp Astron (2021)

  2. NuSTAR observations of a repeatedly microflaring active region
    K. Cooper, I. G. Hannah, B. W. Grefenstette, L. Glesener, S. Krucker, H. S. Hudson, S. M. White, D. M. Smith and J. Duncan
    MNRAS 507 3 (2021) [arXiv link]

  3. NuSTAR Observation of Energy Release in Eleven Solar Microflares
    J. Duncan, L. Glesener, B. W. Grefenstette, J. Vievering, I. G. Hannah, D. M. Smith, S. Krucker, S. M. White, H. S. Hudson
    ApJ 908 29 (2021) [arXiv link]

  4. Hot X-ray Onsets of Solar Flares
    H. S. Hudson, P. J. A. Simoes, L. Fletcher, L. A. Hayes, I. G. Hannah
    MNRAS 501 1 (2021) [arXiv link]

  5. Lyman-alpha Variability During Solar Flares Over Solar Cycle 24 Using GOES-15/EUVS-E
    R. O. Milligan, H. S. Hudson, P. C. Chamberlin, I. G. Hannah, L. A. Hayes
    Space Weather 18 7 (2020) [arXiv link]

  6. NuSTAR Observation of a Minuscule Microflare in a Solar Active Region
    K. Cooper, I. G. Hannah, B. W. Grefenstette, L. Glesener, S. Krucker, H. Hudson, S. White, D. Smith,
    ApJL 893 2 (2020) [arXiv link]

  7. Accelerated electrons observed down to <7 keV in a NuSTAR solar microflare
    L. Glesener, S. Krucker, J. Duncan, I. G. Hannah, B. W. Grefenstette, B. Chen, D. M. Smith, S. M. White, H. Hudson
    ApJL 891 2 (2020) [arXiv link]

  8. Joint X-ray, EUV and UV Observations of a Small Microflare
    I. G. Hannah, L. Kleint, S. Krucker, B. W. Grefenstette, L. Glesener, H. S. Hudson, S. M. White, D. M. Smith,
    ApJ 881 2 (2019) [arXiv link]

  9. The association of the Hale Sector Boundary with RHESSI solar flares & active longitudes
    K. Loumou, I. G. Hannah, H. S. Hudson,
    A&A 12 A9 (2018) [arXiv link]

  10. Hard X-Ray Constraints on Small-Scale Coronal Heating Events
    A. J. Marsh, D. M. Smith, L. Glesener, J. A. Klimchuk, S. J. Bradshaw, J. Vievering, I. G. Hannah, S. Christe, S. Ishikawa, S. Krucker,
    ApJ 864 1 (2018) [arXiv link]

  11. NuSTAR detection of X-ray heating events in the quiet Sun
    M. Kuhar, S. Krucker, L. Glesener, I. G. Hannah, B. W. Grefenstette, D. M. Smith, H. S. Hudson, S. White
    ApJ 856 L32 (2018) [arXiv link]

  12. Determination of Differential Emission Measure from Solar Extreme Ultraviolet Images
    Y. Su, A. Veronig, I. G. Hannah, M. C. Cheung, B. R. Dennis, G. D. Holman, W. Gan, Y. Li
    ApJ 856 L17 (2018)

  13. First NuSTAR Limits on quiet Sun Hard X-ray transient events
    A. Marsh, D. Smith, L. Glesener, I. G. Hannah, B. W. Grefenstette, A. Caspi, S. Krucker, H. S. Hudson, K. K. Madsen, S. White, M. Kuhar, P. J. Wright, S. E. Boggs, F. E. Christensen, W. W. Craig, K. Forster, C. J. Hailey, F. A. Harrison, H. Miyasaka, D. Stern, W. W. Zhang
    ApJ 849 131 (2017) [arXiv link]

  14. Observations of Reconnection Flows in a Flare on the Solar Disk
    J. Wang, P. J. A. Simoes, N. L. S. Jeffrey, L. Fletcher, P. J. Wright, I. G. Hannah
    ApJL 847 1 (2017) [arXiv link]

  15. NuSTAR hard X-ray observation of a sub-A class solar flare
    L. Glesener, S. Krucker, I. G. Hannah, H. S. Hudson, B. W. Grefenstette, S. M. White, D. M. Smith, A. J. Marsh
    ApJ 845 2 (2017) [arXiv link]

  16. Microflare Heating of a Solar Active Region Observed with NuSTAR, Hinode/XRT, and SDO/AIA
    P. J. Wright, I. G. Hannah, B. W. Grefenstette, L. Glesener, S. Krucker, H. S. Hudson, D. M. Smith, A. J. Marsh, S. M. White, M. Kuhar
    ApJ 844 2 (2017) [arXiv link]

  17. Evidence of significant energy input in the late phase of a solar flare from NuSTAR X-ray observations
    M. Kuhar, S. Krucker, I. G. Hannah, L. Glesener, P. Saint-Hilare, B. W. Grefenstette, H. S. Hudson, S. White, D. M. Smith, A. J. Marsh, P. J. Wright, S. E. Boggs, F. E. Christensen, W. W. Craig, C. J. Hailey, F. A. Harrison, D. Stern, W. W. Zhang
    ApJ 835 6 (2017) [arXiv link]

  18. Arcade implosion caused by a filament eruption in a flare
    J. Wang, P. J. A. Simoes, L. Fletcher, J. K. Thalmann, H. S. Hudson, I. G. Hannah
    ApJ 833 2 (2016) [arXiv link]

  19. The first focused hard X-ray images of the sun with NuSTAR
    B. W. Grefenstette, L. Glesener, S. Krucker, H. S. Hudson, I. G. Hannah, D. M. Smith, J. K. Vogel, S. White, K. K. Madsen, A. J. Marsh, A. Caspi, B. Chen, A. Shih, M. Kuhar, S. E. Boggs, F. E. Christensen, W. W. Craig, K. Forster, C. J. Hailey, F. A. Harrison, H. Miyasaka, D. Stern, W. W. Zhang
    ApJ 826 1 (2016) [arXiv link]

  20. Simulation of Quiet-Sun Hard X-rays Related to Solar Wind Superhalo Electrons
    W. Wang, L. Wang, S. Krucker, I. G. Hannah
    Solar Physics 291 1357 (2016) [arXiv link]

  21. The first X-ray imaging spectroscopy of quiescent solar active regions with NuSTAR
    I. G. Hannah, B. W. Grefenstette, D. M. Smith, L. Glesener, S. Krucker, H. S. Hudson, K. K. Madsen, A. Marsh, S. M. White, A. Caspi, A. Y. Shih, F. A. Harrison, D. Stern, S. E. Boggs, F. E. Christensen, W. W. Craig, C. J. Hailey, W. W. Zhang
    ApJL 820 L14 (2016) [arXiv link]

  22. Coronal response to an EUV wave from DEM analysis
    K. Vanninathan, A. M. Veronig, K. Dissauer, M. S. Madjarska, I. G. Hannah & E. P. Kontar
    ApJ 812 2 (2015) [arXiv link]

  23. Solar Sector Structure
    H. S. Hudson, L. Svalgaard and I. G. Hannah
    Space Sciences Reviews 186 1-4, 17-34 (2014) [arXiv link]

  24. Hot Spine Loops and the Nature of a Late-Phase Solar Flare
    X. Sun, J. T. Hoeksema, Y. Liu, G. Aulanier, Y. Su, I. G. Hannah and R. A. Hock
    ApJ 778 139 (2013) [arXiv link]

  25. Multi-thermal dynamics and energetics of a coronal mass ejection in the low solar atmosphere
    I. G. Hannah and E. P. Kontar
    A&A 553 A10 (2013) [arXiv link] [software webpage]

  26. Flare ribbon energetics in the early phase of an SDO flare
    L. Fletcher, I. G. Hannah, H.S. Hudson and D.E. Innes
    ApJ 771 104 (2013) [arXiv link]

  27. The emission measure distribution of impulsive phase flare footpoints
    D. R. Graham, I. G. Hannah, L. Fletcher and R. O. Milligan
    ApJ 767 83 (2013) [arXiv link]

  28. Effect of turbulent density fluctuations on wave-particle interactions and solar flare Xray spectra
    I. G. Hannah, E. P. Kontar and H. A. S. Reid
    A&A 550 A51 (2013) [arXiv link]

  29. Kelvin-Helmholtz Instability of the CME Reconnection Outflow Layer in the Low Corona
    C. Foullon, E. Verwichte, K. Nykyri, M. J. Aschwanden and I. G. Hannah
    ApJ 767 170 (2013)

  30. Differential Emission Measures from the Regularized Inversion of SDO and Hinode data
    I. G. Hannah and E. P. Kontar
    A&A 539 A146 (2012) [arXiv link][software webpage]

  31. Solar Particle Acceleration, Radiation and Kinetics (SPARK): a mission to understand the nature of particle acceleration
    S. Matthews, D. Williams, K. Klein, E. Kontar, D. Smith, S. Krucker, A. Lagg, G. Hurford, N. Vilmer, A. MacKinnon, V. Zharkova, L. Fletcher, I. G. Hannah, P. Browning, D. Innes, G. Trottet, C. Foullon, V. Nakariakov, L. Green, H. Lamoureux, C. Forsyth, D. Walton, M. Mathioudakis, A. Gandorfer, V. Martinez -Pillet, O. Limousin, E. Verwichte, S. Dalla, G. Mann, H. Aurass, T. Neukirch
    Experimental Astronomy 33 2-3 237-269 (2012)

  32. Microflares and the Statistics of X-ray Flares
    I. G. Hannah, H. S. Hudson, M. Battaglia, S. Christe, J. Kasparova, M. Kundu, S. Krucker, A. Veronig
    Space Sciences Reviews 159 1-4 233-300 (2011) [arXiv link]

  33. Hinode/EIS density diagnostics in the flaring solar chromosphere
    D. R. Graham, L. Fletcher, I. G. Hannah
    A&A 532 A27 (2011)

  34. Estimates of Densities and Filling Factors from a Cooling Time Analysis of Solar Microflares Observed with RHESSI
    R. N. Baylor, P. A. Cassak, S. Christe, I. G. Hannah, S. Krucker, D. J. Mullan, M. A. Shay, H. S. Hudson, and R. P. Lin
    ApJ 736 75 (2011) [arXiv link]

  35. Flaring Solar Hale Sector Boundaries
    L. Svalgaard, I. G. Hannah, H. S. Hudson
    ApJ 733 49 (2011) [arXiv link]

  36. The spectral difference between solar flare HXR coronal and footpoint sources due to wave-particle interactions.
    I. G. Hannah and E. P. Kontar
    A&A 529 A109 (2011) [arXiv link]

  37. Acceleration, magnetic fluctuations and cross-field transport of energetic electrons in a solar flare loop
    E. P. Kontar , I. G. Hannah, N. H. Bian
    ApJ 730 L22 (2011) [arXiv link]

  38. The influence of albedo on the size of hard X-ray flare sources
    M. Battaglia, E. P. Kontar and I. G. Hannah
    A&A 526, A3 (2011) [arXiv link]

  39. Constraining the hard X-ray properties of the quiet Sun with new RHESSI observations
    I. G. Hannah, H. S. Hudson, G. J. Hurford and R. P. Lin.
    ApJ 724 487-492 (2010) [arXiv link]

  40. From large-scale loops to the sites of dense flaring loops: preferential conditions for long-period pulsations in solar flares
    C. Foullon, L. Fletcher, I. G. Hannah, E. Verwichte, B. Cecconi, V. M. Nakariakov, K. J. H. Phillips, B. L. Tan
    ApJ 719, 151-165 (2010)

  41. The Sub-Arcsecond Structure of Solar Flare Hard X-ray Footpoints
    E. P. Kontar, I. G. Hannah, N. L. Jeffery, M. Battaglia
    ApJ 717, 250-256 (2010) [arXiv link]

  42. The effect of wave-particle interactions on low energy cutoffs in solar flare electron spectra
    I. G. Hannah, E. P. Kontar, O. K. Sirenko
    ApJ 707, L45-L50 (2009) [arXiv link]

  43. Magnetic flux cancellation associated with a recurring solar jet observed Hinode, RHESSI and STEREO/EUVI
    C. Chifor, H. Isobe, H. E. Mason, I. G. Hannah, P. R. Young, G. Del Zanna, S. Krucker, K. Ichimoto, Y. Katsukawa and T. Yokoyama
    A&A 491, 279-288 (2008) [pdf preprint]

  44. Chromospheric magnetic field & density structure measurements using hard X-rays in a flaring coronal loop
    E. P. Kontar, I. G. Hannah and A. L. MacKinnon
    A&A 489, L57-L60 (2008) [arXiv link]

  45. RHESSI Microflare Statistics II: X-ray Imaging, Spectroscopy & Energy Distributions
    I. G. Hannah, S. Christe, S. Krucker, G. J. Hurford, H. S. Hudson and R. P. Lin
    ApJ 677, 704-718 (2008) [arXiv link]

  46. RHESSI Microflare Statistics I: Flare-finding & Frequency Distributions
    S. Christe, I. G. Hannah,S. Krucker, J. McTiernan and R. P. Lin
    ApJ 677 1385-1394 (2008) [pdf pre-print]

  47. An Intriguing Solar Microflare Observed with RHESSI, Hinode and TRACE
    I. G. Hannah, S. Krucker, H. S. Hudson, S. Christe and R. P. Lin
    A&A 481 L45-L48 (2008) [arXiv link]

  48. Coronal Jet Observed by Hinode as the source of a 3He-rich SEP Event
    N. V. Nitta, G. M. Mason, M. E. Wiedenbeck, C. M. S. Cohen, S. Krucker, I. G. Hannah, M. Shimojo, and K. Shibata
    ApJL 675 L125 (2008) [pdf pre-print]

  49. RHESSI and Hinode X-Ray Observations of a Partially Occulted Solar Flare
    S. Krucker, I. G. Hannah, R. P. Lin
    ApJL 671 L193 (2007)

  50. First limits on the 3-200 keV X-ray spectrum of the quiet Sun using RHESSI
    I. G. Hannah, G. J. Hurford, H. S. Hudson, R. P. Lin and K. van Bibber
    ApJL 659, L77 (2007) [arXiv link]

  51. A TRACE White Light and RHESSI Hard X-Ray Study of Flare Energetics
    L. Fletcher, I. G. Hannah, H. S. Hudson and T. R. Metcalf
    ApJ 656, 1187-1196 (2007)

  52. A new method of observing weak extended X-ray sources with RHESSI
    I. G. Hannah, G. J. Hurford, H. S. Hudson and R. P. Lin
    Review of Scientific Instruments 78, 024501 (2007) [arXiv link]

  53. Comparison of the Energy Spectra and Number Fluxes from a Simple Flare Model to Observations.
    I. G. Hannah and L. Fletcher
    Solar Physics, 236, 59-74 (2006) [post-print link]


  1. Solar Particle Acceleration, Radiation & Kinetics (SPARK)
    Matthews, Baker, Bloomfield, Browning, Calcines, Del Zanna, Erdelyi, Fletcher, Hannah, Jeffrey, Klein, Krucker, Kontar, Long, MacKinnon, Mann, Mathioudakis, Milligan, Pesce-Rollins, Reid, Shih, Smith, Veronig, Vilmer,
    ESA Voyage 2050 White Paper (2019)

  2. Exploring impulsive solar magnetic energy release and particle acceleration with focused hard X-ray imaging spectroscopy
    S. D. Christe et al., I. G. Hannah,
    Next Generation Solar Physics Mission (2017)

  3. X-ray Searches for Solar Axions
    H. S. Hudson, L. W. Acton, E DeLuca, I. G. Hannah, K. Reardon, and K. van Bibber
    4th Hinode Science Meeting (2012)

  4. Microflares with RHESSI and Hinode/XRT
    I. G. Hannah, S. Krucker, S. Christe, H. S. Hudson and R. P. Lin
    1st Hinode Results Meeting, Dublin, Ireland, ASPC 397 (2008)

  5. Active Region Microflares From Hinode and RHESSI
    C. Chifor, I. G. Hannah, H. E. Mason, H. Isobe, T. Yokoyama, P. R. Young, and D. Tripathi
    1st Hinode Results Meeting, Dublin, Ireland, ASPC 397 (2008)

  6. Physical Conditions in Coronal Structures About to Flare
    H. S. Hudson, I. G. Hannah, E. E. DeLuca, and M. Weber
    1st Hinode Results Meeting, Dublin, Ireland, ASPC 397 (2008)

  7. Energy Deposition in White Light Flares with TRACE and RHESSI
    L. Fletcher, I. G. Hannah, H. S. Hudson, T. R. Metcalf
    The Physics of Chromospheric Plasmas (2007), Coimbra, Portugal

  8. RHESSI Microflare Statistics
    I. G. Hannah, S. Christe, S. Krucker, H. S. Hudson, L. Fletcher and M. A. Hendry.
    SOHO 15 Meeting (2004), St. Andrews, Scotland, UK

  9. Chaotic dynamics and collisionless reconnection at an X-type neutral point
    I. G. Hannah, L. Fletcher & M. A. Hendry
    European Solar Physics Meeting: SPM10 (2002), Prague, Czech Republic


- Sarah Paterson (1st Supervisor, 2019-)
- Dr Alasdair Wilson (2019-2021)
- Kristopher Cooper (1st Supervisor, 2018-)
- Konstantina Loumou (1st Supervisor, 2015-2019)
- Paul Wright (1st Supervisor, 2014-2019)
- Juntao Wang (2nd Supervisor, 2014-2018)


- International Astronomical Union (IAU): Member;
- Institute of Physics (IoP): Member (MInstP);
- Royal Astronomical Society (RAS): Fellow (FRAS);
- Solar Physics Division/American Astronomical Society (SPD/AAS): Member;
- American Geophysical Union (AGU): Member;
- European Physical Society (EPS), Solar Physics Division: Member;
- UK Solar Physics (UKSP) Deputy Chair (2016) & Council Member (2009-2012, 2013).


Aug 2021 to presentSenior Lecturer, University of Glasgow

Nov 2018 to July 2021 Lecturer (Proleptic), University of Glasgow

Oct 2013 to Sep 2021 Royal Society University Research Fellow, University of Glasgow

Oct 2013 to Sep 2018 LKAS Leadership Fellowship, University of Glasgow

May 2008 to Sep 2013 Research Associate, University of Glasgow

May 2005 to May 2008 Post-Doctoral Researcher, UC Berkeley, USA

Oct 2001 to May 2005 PhD in Solar Physics, University of Glasgow

Oct 1997 to Jun 2001 MSci (Hons) in Physics and Astronomy, University of Glasgow

Last Updated: 17 Feb 2022