Picture of Jean-Pierre St. Maurice

Jean-Pierre St. Maurice Ph D 1975, Yale University

Office
Physics Rm 259

Research Area(s)

  • The study of the evolution of structures and, ultimately, turbulence
  • The study of ion velocity distributions, which can be very different from the Maxwellian (Gaussian) shape associated with thermal equilibrium
  • Theoretical tools like kinetic and plasma theory to study small scale processes, numerical and theoretical tools to study the neutral wind circulation, Joule heating, and the generation of internal gravity waves in the atmosphere
  • Experimental tools like radar and satellite data to study large scale processes and plasma turbulence in the radar case
  • AMISR incoherent scatter radar at Resolute Bay and an international PI on the SuperDARN radar network, which currently comprises of the order of 20 radars used to study the plasma circulation on a global scale

About me

Scientific Program Chair for the International COSPAR general assembly held in Montreal in the summer of 2008.

Recent Chair of the Science Advisory Committee on Solar-Terrestrial Relations for the Canadian Space Agency

Member of the Senior Space Science Advisory committee to the Canadian Space Agency.

Publications

Some of the more important publications of the past few years:

St.-Maurice, J.-P. and A. M. Hamza (2009) Small scale irregularities at high latitudes. In "Characterising the Ionosphere", ed. G. Wyman; Technical Report RTO-TR-IST-051, Chapter 1, p. 70. Neuilly-sur-Seine, France: RTO. Available from: http://www.rto.nato.int/abstracts.aspx

Ponomarenko, P.V.,  J.-P. St-Maurice, C. L. Waters, R. G. Gillies, and A. V. Koustov,  Refractive index effects on the scatter volume location and Doppler velocity estimates of ionospheric HF backscatter echoes,  Ann. Geophys.,  27, 4207–4219, 2009.

Perron, P.J., J.-M. Noel, and J.-P. St.-Maurice, Velocity shear and current driven instability in a collisional F-region, Annales Geophysicae, 27, 381-394, 2009.

Ma, J.Z. G., and J.-P. St.-Maurice (2008), Ion distribution functions in cylindrically symmetric electric fields in the auroral ionosphere: the collision-free case in a uniformly charged configuration, J. Geophys. Res., J. Geophys. Res., 113, A05312, doi:10.1029/2007JA012815, 13 pages.

Kissack, R. S., L. M. Kagan, and J.-P. St.-Maurice (2008), Thermal effects on Farley-Buneman waves at nonzero aspect and flow angles, I: Dispersion relation, Physics of Plasmas, 15- 2, pp. 022901-022901-14.

St.-Maurice, J.-P. and R.K. Choudhary (2007), The influence of non-isothermal electrons and neutral wind structures on the Doppler properties of vertical m-size field-aligned irregularities in the low latitude E region,  Revista Brasileira de Geof´ýsica, 25(Supl. 2): 95-103.

 St.-Maurice, J.-P., and R.K. Choudhary, Local ionospheric electrodynamics associated with neutral wind fields at low latitudes: Kelvin-Helmholtz billows, Ann. Geo., 24, 1367-1374, 2006.

Choudhary, R.K., J.-P. St.-Maurice, W. Eklund, and R. T. Tsunoda, (2006) East-west and vertical spectral asymmetry associated with equatorial type-I waves during strong electrojet conditions: I. Pohnpei radar observations, J. Geophys. Res., Vol. 111, No. A11, A11302,.doi.org/10.1029/2006JA011842, 12 pages.

St-Maurice, J.-P. and R. K. Choudhary (2006), East-west and vertical spectral asymmetry associated with equatorial type-I waves during strong electrojet conditions: II. Theory, J. Geophys. Res., Vol. 111, No. A11, A11303, doi.org/10.1029/2006JA011843. 11 pages.

St.-Maurice, J.-P., J.-M. Noel, and P. J. Perron (2006) An assessment of how a combination of shears, field-aligned currents and collisions affect F-region ionospheric instabilities, J. Plasma Phys., 72, part 4, 1-20.

 

 Noel, J.-M., St.-Maurice, J.-P., and P.-L. Blelly (2005)   The effect of E-region wave heating on electrodynamical structures, Annales Geophysicae, 23, 6, 2081-2094.

Schlegel, K.,  H. Lühr, J.-P. St.-Maurice, G. Crowley (2005)   Thermospheric Density Structures over the Polar Regions observed with CHAMP, Annales Geophysicae, 23, 5, 1659-1672. Drexler, J., and J.-P. St.-Maurice (2005) A possible origin for large aspect angle “HAIR" echoes seen by SuperDARN radars in the E region,  Annales Geophysicae, 23, 767-772.

Drexler, J., and J.-P. St.-Maurice (2005) A possible origin for large aspect angle “HAIR" echoes seen by SuperDARN radars in the E region,  Annales Geophysicae, 23, 767-772. 

Kagan, L. M., and J.‑P. St.‑Maurice (2005) Origin of type‑2 thermal‑ion upflows in the auroral ionosphere, Ann. Geophys., Ann. Geophys., 23: 13–24.

Sheehan, C. H. and St.‑Maurice, J.‑P. (2004) The dissociative recombination of N2+, O2+, and NO+: rate coefficients for ground state and vibrationnally excited ions, J. Geophys. Res., J. Geophys. Res., 109, A03302, doi:10.1029/ 2003JA010132 (21 pages).

Drexler, J., J.-P. St.-Maurice, Chen, Donglei and D.R. Moorcroft (2002) New insights from a non-local generalization of the Farley-Buneman instability problem at high latitudes.  Ann. Geophys., 20, 2003‑2025.

Sedgemore-Schelthess, F. and St.-Maurice, J.-P. (2001) Naturally enhanced ion-acoustic spectra and their interpretation.  Surveys in Geophysics 22: 55-92.

St.-Maurice, J.-P. and A.M. Hamza (2001) A new nonlinear approach to the theory of E region irregularities. J. Geophys. Res. 106(A2): 1751-1759.

 

Research

Atmospheric & Space Physics atmosphere gravity ionosphere plasma radar turbulence

The focal point of the research undertaken by Professor St-Maurice and his collaborators is the ionosphere. In the grand scheme of things, this region is the interface where the neutral atmosphere meets the upper ionized regions called magnetosphere and plasmasphere. The ionospheric region is rich with electrical currents triggered either by neutral winds and atmospheric tides generators at lower altitudes and latitudes or by the interaction of the solar wind with the magnetosphere at much higher altitudes and latitudes. In the latter case the electrical currents trigger the spectacular aurora borealis. Some of the research is devoted to the small scale processes responsible for the redistribution of energy and momentum inside a particular constituent like the plasma itself. Or they can involve the exchange of energy and momentum between constituents like the plasma and the background neutral gas. These studies involve the study of the evolution of structures and, ultimately, turbulence. They also involve the study of ion velocity distributions, which can be very different from the Maxwellian (Gaussian) shape associated with thermal equilibrium. The exchange of momentum and energy between species also triggers larger scale phenomena, for instance, large scale winds and internal gravity waves in the neutral atmosphere. Finally, on larger scales still, the solar wind deposits a lot of its energy and momentum to the magnetosphere and ionosphere, creating a large scale circulation pattern that covers the polar cap and the auroral regions, and sometimes extends to equatorial regions! The research group is particularly interested nowadays in the circulation that takes place over the polar cap itself, outside the auroral regions proper. Prof St-Maurice uses theoretical tools like kinetic and plasma theory to study small scale processes, numerical and theoretical tools to study the neutral wind circulation, Joule heating, and the generation of internal gravity waves in the atmosphere, and experimental tools like radar and satellite data to study large scale processes and plasma turbulence in the radar case, and to study more local kinetic processes in the satellite case. He is currently a co-PI on the US funded AMISR incoherent scatter radar at Resolute Bay and an international PI on the SuperDARN radar network, which currently comprises of the order of 20 radars used to study the plasma circulation on a global scale.

For short vignettes on Prof. St-Maurice's research interests, click here (for u of S production) or here (for Nortel production where you'll need Real Player 8 or higher)

For more details go to Prof. St-Maurice's personnal web page.