Hargreaves, J. K., Birch, Martin John and Bromage, B. J. I. (2007) D- and E-region effects in the auroral zone during a moderately active 24-h period in July 2005. Annales Geophysicae, 25 (8). pp. 1837-1849. ISSN 0992-7689
Birch, Martin John, Hargreaves, J. K., Senior, A. and Bromage, B. J. I. (2007) Correlation of ring current indices with invariant latitude cutoff for three SEP events from 2001. In: National Astronomy Meeting (NAM) 2007, 16-20 April 2007, University of Central Lancashire, Preston, United Kingdom.
Birch, Martin John, Hargreaves, J. K., Bromage, B. J. I. and Senior, A. (2004) Three proton events in 2001. In: Conference on Sun-Earth Connections, 9 February 2004, Kona, Hawaii.
Birch, Martin John, Hargreaves, J. K., Senior, A. and Bromage, B. J. I. (2003) Variations of Cutoff Latitude for Selected Solar Energetic Proton Events. In: EGS-AGU-EUG Joint Assembly,, 6-11 April 2003, Nice, France.
Birch, Martin John and Bromage, B. J. I. (2002) The Solar Proton Events of Solar Cycle 23. In: UKSP/MIST Conference 2002, April 2002, University of Sheffield, United Kingdom.