Items where NERC Author is "Watkins, Nicholas"

2013

Stainforth, David A.; Chapman, Sandra C.; Watkins, Nicholas W.. 2013 Mapping climate change in European temperature distributions. Environmental Research Letters, 8 (3). 9, pp. https://doi.org/10.1088/1748-9326/8/3/034031

Capparelli, V.; Franzke, C.; Vecchio, A.; Freeman, M.P. ORCID: https://orcid.org/0000-0002-8653-8279; Watkins, N.W.; Carbone, V.. 2013 A spatiotemporal analysis of U.S. station temperature trends over the last century. Journal of Geophysical Research: Atmospheres, 118 (14). 7427-7434. https://doi.org/10.1002/jgrd.50551

Chapman, S.C.; Stainforth, D.A.; Watkins, N.W.. 2013 On estimating local climate sensitivity. Philosophical Transactions of the Royal Society of London, A, 371 (1991), 20120287. 17, pp. https://doi.org/10.1098/rsta.2012.0287

Watkins, N.W.. 2013 Bunched black (and grouped grey) swans: Dissipative and non-dissipative models of correlated extreme fluctuations in complex geosystems. Geophysical Research Letters, 40 (2). 402-410. https://doi.org/10.1002/grl.50103

2012

Vértes, Petra E.; Nicol, Ruth M.; Chapman, Sandra C.; Watkins, Nicholas W.; Robertson, Duncan A.; Bullmore, Edward T.. 2012 Topological isomorphisms of human brain and financial market networks. Frontiers in Systems Neuroscience, 5, 75. 12, pp. https://doi.org/10.3389/fnsys.2011.00075

Sharma, A. Surjalal; Baker, Daniel N.; Bhattacharyya, Archana; Bunde, Armin; Dimri, Vijay P.; Gupta, Harsh K.; Gupta, Vijay K.; Lovejoy, Shaun; Main, Ian G.; Schertzer, Daniel; von Storch, Hans; Watkins, Nicholas W.. 2012 Complexity and extreme events in geosciences: an overview. In: Sharma, A. Surjal; Bunde, Armin; Dimri, V.P.; Baker, Dan, (eds.) Extreme events and natural hazards: the complexity perspective. Washington, American Geophysical Union, 16pp. (Geophysical Monograph Series, 196).

Watkins, N.W.; Hnat, B.; Chapman, S.C.. 2012 On self-similar and multifractal models for the scaling of extreme bursty fluctuations in space plasmas. In: Sharma, A. Surjalal; Bunde, Armin; Dimri, Vijay P; Baker, Daniel N., (eds.) Extreme Events and Natural Hazards: The Complexity Perpective. Washington, American Geophysical Union, 299-313. (Geophysical Monograph Series, 196).

Watkins, Nicholas. 2012 Review of 'The physics of foraging: an introduction to random searches and biological encounters', G.M. Viswanathan, M.G.E. da Luz, E.M. Raposo and H.E. Stanley, Cambridge University Press, 2011, pp. 164. Physics Today, 65 (1). 44.

Franzke, Christian; Graves, Timothy; Watkins, Nicholas; Gramacy, Robert B.; Hughes, Cecilia. 2012 Robustness of estimators of long-range dependence and self-similarity under non-Gaussianity. Philosophical Transactions of the Royal Society of London, A, 370 (1962). 1250-1267. https://doi.org/10.1098/rsta.2011.0349

2010

Freeman, Mervyn P. ORCID: https://orcid.org/0000-0002-8653-8279; Watkins, Nicholas W.; Yoneki, Eiko; Crowcroft, Jon. 2010 Rhythm and randomness in human contact. 2010 International Conference on Advances in Social Networks Analysis and Mining. 184-191. https://doi.org/10.1109/ASONAM.2010.57

2009

Chapman, S.C.; Watkins, Nicholas W.. 2009 Avalanching systems under intermediate driving rate. Plasma Physics and Controlled Fusion, 51 (12), 124006. 9, pp. https://doi.org/10.1088/0741-3335/51/12/124006

Watkins, Nicholas W.; Chapman, S.C.; Rosenberg, Samuel J.. 2009 Comment on "Coexistence of self-organized criticality and intermittent turbulence in the solar corona". Physical Review Letters, 103 (3), 039501. 1, pp. https://doi.org/10.1103/PhysRevLett.103.039501

Watkins, Nicholas; Credgington, Daniel; Sanchez, Raul; Rosenberg, Samuel; Chapman, Sandra. 2009 Kinetic equation of linear fractional stable motion and applications to modeling the scaling of intermittent bursts. Physical Review E, 79, 041124. 9, pp. https://doi.org/10.1103/PhysRevE.79.041124

Chapman, S. C.; Rowlands, G.; Watkins, N.W.. 2009 Macroscopic control parameter for avalanche models of bursty transport. Physics of Plasmas, 16, 012303. 7, pp. https://doi.org/10.1063/1.3057392

Kiyani, K.H.; Chapman, S.C.; Watkins, N.W.. 2009 Pseudononstationarity in the scaling exponents of finite-interval time series. Physical Review E, 79, 036109. 11, pp. https://doi.org/10.1103/PhysRevE.79.036109

2008

Watkins, Nicholas W.; Freeman, Mervyn P. ORCID: https://orcid.org/0000-0002-8653-8279. 2008 Natural complexity. Science, 320 (5874). 323-324. https://doi.org/10.1126/science.1151611

2007

Abel, G.A.; Freeman, M.P. ORCID: https://orcid.org/0000-0002-8653-8279; Chisham, G. ORCID: https://orcid.org/0000-0003-1151-5934; Watkins, N.W.. 2007 Investigating turbulent structure of ionospheric plasma velocity using the Halley SuperDARN radar. Nonlinear Processes in Geophysics, 14 (6). 799-809. https://doi.org/10.5194/npg-14-799-2007

Abel, Gary A.; Freeman, Mervyn P. ORCID: https://orcid.org/0000-0002-8653-8279; Chisham, Gareth ORCID: https://orcid.org/0000-0003-1151-5934; Watkins, Nicholas W.. 2007 Investigating the turbulent structure of ionospheric plasma velocities on open and closed magnetic field lines. In: Shaikh, Dastgeer; Zank, Gary P., (eds.) Turbulence and nonlinear processes in astrophysical plasmas. Melville, New York, American Institute of Physics, 307-312. (AIP conference proceedings, 932).

Hnat, B.; Chapman, S.C.; Kiyani, K.; Rowlands, G.; Watkins, Nicholas W.. 2007 On the fractal nature of the magnetic field energy density in the solar wind. Geophysical Research Letters, 34 (15), L15108. 4, pp. https://doi.org/10.1029/2007GL029531

Edwards, Andrew M.; Phillips, Richard A.; Watkins, Nicholas W.; Freeman, Mervyn P. ORCID: https://orcid.org/0000-0002-8653-8279; Murphy, Eugene J, ORCID: https://orcid.org/0000-0002-7369-9196; Afanasyev, Vsevolod; Buldyrev, Sergey V.; da Luz, M. G. E.; Raposo, E. P.; Stanley, H. Eugene; Viswanathan, Gandhimohan M.. 2007 Revisiting Lévy flight search patterns of wandering albatrosses, bumblebees and deer. Nature, 449 (7165). 1044-1048. https://doi.org/10.1038/nature06199

2005

Chapman, S.C.; Rowlands, G.; Watkins, N.W.. 2005 Scaling and commonality in anomalous fluctuation statistics in models for turbulence and ferromagnetism. Journal of Physics A: Mathematical and General, 38 (10). 2289-2297. https://doi.org/10.1088/0305-4470/38/10/016

Chapman, S.C.; Hnat, B.; Rowlands, G.; Watkins, N.W.. 2005 Scaling collapse and structure functions: identifying self-affinity in finite length time series. Nonlinear Processes in Geophysics, 12 (6). 767-774. https://doi.org/10.5194/npg-12-767-2005

Watkins, Nicholas W.; Credgington, Daniel; Hnat, Bogdan; Chapman, Sandra C.; Freeman, Mervyn P. ORCID: https://orcid.org/0000-0002-8653-8279; Greenhough, John. 2005 Towards synthesis of solar wind and geomagnetic scaling exponents: a fractional Levy motion model. Space Science Reviews, 121 (1-4). 271-284. https://doi.org/10.1007/s11214-006-4578-2

2004

Watkins, Nick. 2004 Citation rates. [Letter commenting on the article "Citation measures and impact within astronomy" by F.R. Pearce, published in Astronomy and Geophysics, 45, No. 2, 15-17]. Astronomy and Geophysics, 45 (5). 5.9-5.9.

Chapman, S.C.; Denby, R.O.; Watkins, N.W.. 2004 Robustness and scaling: key observables in the complex dynamic magnetosphere. Plasma Physics and Controlled Fusion, 42 (12B). B157-B166. https://doi.org/10.1088/0741-3335/46/12B/014

2003

Clarke, Richard W.; Freeman, Mervyn P. ORCID: https://orcid.org/0000-0002-8653-8279; Watkins, Nicholas W.. 2003 Application of computational mechanics to the analysis of natural data: an example in geomagnetism. Physical Review E, 67 (1-2), 016203. 15, pp. https://doi.org/10.1103/PhysRevE.67.016203

Hnat, B.; Chapman, S.C.; Rowlands, G.; Watkins, N.W.; Freeman, M.P.. 2003 Scaling in long term data sets of geomagnetic indices and solar wind epsilon as seen by WIND spacecraft. Geophysical Research Letters, 30 (22), 2174. 4. https://doi.org/10.1029/2003GL018209

2002

Hnat, B.; Chapman, S.C.; Rowlands, G.; Watkins, N.W.; Farrell, W.M.. 2002 Finite size scaling in the solar wind magnetic field energy density as seen by WIND. Geophysical Research Letters, 29 (10), 1446. 86-1-86-4. https://doi.org/10.1029/2001GL014587

Watkins, N.W.; Chapman, S.C.; Rowlands, G.. 2002 Comment on 'Universal fluctuations in correlated systems'. Physical Review Letters, 89 (20). 208901.

Chapman, S.C.; Rowlands, G.; Watkins, Nicholas W.. 2002 Extremum statistics: a framework for data analysis. Nonlinear Processes in Geophysics, 9 (5-6). 409-418.

Watkins, N.W.. 2002 Scaling in the space climatology of auroral indices: is SOC the only possible description? Nonlinear Processes in Geophysics, 9 (5-6). 389-397.

Hnat, B.; Chapman, S.C.; Rowlands, G.; Watkins, N.W.; Freeman, M.P. ORCID: https://orcid.org/0000-0002-8653-8279. 2002 Scaling of solar wind epsilon and the AU, AL and AE indices by WIND. Geophysical Research Letters, 29 (22), 2078. 4, pp. https://doi.org/10.1029/2002GL016054

Chapman, S.C.; Watkins, Nicholas W.. 2002 Self-organized criticality and turbulence in the solar system and beyond. In: Murdin, P., (ed.) Encylopedia of astronomy and astrophysics. Basingstoke, Nature Publishing, 3pp.

Freeman, Mervyn P. ORCID: https://orcid.org/0000-0002-8653-8279; Watkins, Nicholas W.. 2002 The heavens in a pile of sand. Science, 298 (5595). 979-980. https://doi.org/10.1126/science.1075555

2001

Watkins, N.W.; Freeman, M.P. ORCID: https://orcid.org/0000-0002-8653-8279; Rhodes, C.S.; Rowlands, G.. 2001 Ambiguities in determination of self-affinity in the AE-index time series. Fractals, 9 (4). 471-479. https://doi.org/10.1142/S0218348X01001123

Chapman, Sandra; Watkins, Nicholas. 2001 Avalanching and self organised criticality, a paradigm for geomagnetic activity? Space Science Reviews, 95 (1-2). 293-307. https://doi.org/10.1023/A:1005236717469

Watkins, N.W.; Bharmal, N.A.; Clilverd, M.A. ORCID: https://orcid.org/0000-0002-7388-1529; Smith, A.J.. 2001 Comparison of VLF sferics intensities at Halley, Antarctica, with tropical lightning and temperature. Radio Science, 36 (5). 1053-1064. https://doi.org/10.1029/2000RS002367

Watkins, N.W.; Clilverd, M.A. ORCID: https://orcid.org/0000-0002-7388-1529; Smith, A.J; Rodger, C.J.; Bharmal, N.A.; Yearby, K.H.. 2001 Lightning atmospherics count rates observed at Halley, Antarctica. Journal of Atmospheric and Solar-Terrestrial Physics, 63 (10). 993-1003. https://doi.org/10.1016/S1364-6826(01)00009-8

Chapman, S.C.; Watkins, N.W.; Rowlands, G.. 2001 Signatures of dual scaling regimes in a simple avalanche model for magnetospheric activity. Journal of Atmospheric and Solar-Terrestrial Physics, 63 (13). 1361-1370. https://doi.org/10.1016/S1364-6826(00)00237-6

Watkins, N.W.; Freeman, M.P. ORCID: https://orcid.org/0000-0002-8653-8279; Chapman, S.C; Dendy, R.O. 2001 Testing the SOC hypothesis for the magnetosphere. Journal of Atmospheric and Solar-Terrestrial Physics, 63 (13). 1435-1445. https://doi.org/10.1016/S1364-6826(00)00245-5

Watkins, N.W.; Oughton, S.; Freeman, M.P. ORCID: https://orcid.org/0000-0002-8653-8279. 2001 What can we infer about the underlying physics from burst distributions observed in an RMHD simulation? Planetary and Space Science, 49 (12). 1233-1237. https://doi.org/10.1016/S0032-0633(01)00064-2

2000

Tam, Sunny W. Y.; Chang, Tom; Chapman, S. C.; Watkins, N. W.. 2000 Analytical determination of power-law index for the Chapman et al. sandpile (FSOC) analog for magnetospheric activity - a renormalization-group analysis. Geophysical Research Letters, 27 (9). 1367-1370. https://doi.org/10.1029/2000GL000030

Chapman, S.C.; Rowlands, G.; Watkins, N.W.; Dendy, R.O.. 2000 Avalanche models and geomagnetic activity. In: Biernat, H.K.; Farrugia, C.J.; Vogl, D.F., (eds.) The solar wind-magnetosphere system 3. Proceedings of the international workshop, Graz, September 1998. Vienna, Verlag der Osterreichischen Akademie der Wissenschaften, 309-317.

Freeman, M.P. ORCID: https://orcid.org/0000-0002-8653-8279; Watkins, N.W.; Riley, D.J.. 2000 Evidence for a solar wind origin of the power law burst lifetime distribution of the AE indices. Geophysical Research Letters, 27 (8). 1087-1090. https://doi.org/10.1029/1999GL010742

Freeman, M.P. ORCID: https://orcid.org/0000-0002-8653-8279; Watkins, N.W.; Riley, D.J.. 2000 Power law distributions of burst duration and interburst interval in the solar wind: Turbulence or dissipative self-organized criticality? Physical Review E, 62 (6). 8794-8797. https://doi.org/10.1103/PhysRevE.62.8794

Tam, Sunny W. Y.; Chang, Tom; Chapman, S.C.; Watkins, N.W.. 2000 Renormalization-group study of a sandpile (FSOC)analog for magnetospheric activity. In: Wilson, Andrew, (ed.) Proceedings of the Fifth International Conference on Substorms, St. Petersburg, Russia, May 2000. ESA, 205-208. (ESA Special Publication, 443).

1999

Helander, P.; Chapman, S.C.; Dendy, R.O.; Rowlands, G.; Watkins, N.W.. 1999 Exactly solvable sandpile with fractal avalanching. Physical Review E., 59 (6). 6356-6360. https://doi.org/10.1103/PhysRevE.59.6356

Clilverd, Mark A. ORCID: https://orcid.org/0000-0002-7388-1529; Watkins, Nicholas W.; Smith, Andy J.; Yearby, Keith H.. 1999 Diurnal and annual variations in 10-kHz radio noise. Radio Science, 34 (4). 933-938. https://doi.org/10.1029/1999RS900009

Watkins, N. W.; Chapman, S. C.; Dendy, R. O.; Rowlands, G.. 1999 Robustness of collective behaviour in strongly driven avalanche models: Magnetospheric implications. Geophysical Research Letters, 26 (16). 2617-2620. https://doi.org/10.1029/1999GL900586

1998

Watkins, Nicholas W.; Clilverd, Mark A. ORCID: https://orcid.org/0000-0002-7388-1529; Smith, Andy J.; Yearby, Keith H.. 1998 A 25-year record of 10 kHz sferics noise in Antarctica: Implications for tropical lightning levels. Geophysical Research Letters, 25 (23). 4353-4356. https://doi.org/10.1029/1998GL900146

Chapman, S.C.; Watkins, N.W.; Dendy, R.O.; Rowlands, G.. 1998 Avalanche models and auroral indices. In: Kokubun, S.; Kamide, Y., (eds.) Substorms-4: International Conference on Substorms-4, Lake Hamana, Japan, March 1998. Dordrecht, Kluwer, 323-326. (Astrophysics and Space Science Library, 238).

Chapman, S. C.; Watkins, N. W.; Dendy, R. O.; Helander, P.; Rowlands, G.. 1998 A simple avalanche model as an analogue for magnetospheric activity. Geophysical Research Letters, 25 (13). 2397-2400. https://doi.org/10.1029/98GL51700