My research focuses on making in situ measurements of the plasma environment
of the Earth's magnetosphere. Within the magnetosphere, my primary research
interest is auroral physics and magnetosphere-ionsphere coupling processes.
Much of my work has concentrated on measurements of the electrons and ions
in this region. These measurements are made both by satellites and small,
sub-orbital rockets known as sounding rockets. Several of these sounding
rocket flights have been over active aurora - a phenomena which is one
of my strongest research interests. I am quite interested in understanding
interactions between waves and particles to understand how energy exchanged
between electric and magnetic fields and the kinetic energy of particles.
I am also very interested in the wave-particle intersactions which take place in the Earth's Van Allen radiation belts. I am the Principal Investigator for the Electric and Magneitc Field Instrument Suite and Integrated Science (EMFISIS) on NASA's twin spacecraft Van Allen Probees (formerly RBSP) that was luanched August 30, 2012. Our investigation concentrates on the waves in the radiation belts such as chorus, plasmaspheric hiss, magnetosonic equatorial noise, and EMIC waves. Our suite also provided the DC magnetic field measurements for the mission. These measurements are proving to be some of the most highly resolved ever made in the radiation belts.
To further this understanding of wave-particle interactions, I have developed new techniques for measuring
wave-particle correlations. These interactions can occur an MHz frequencies
so this is a challenging experimental problem, but one for which there
are several possiblilities for improving on current instrumentation. We
had a rocket flight in the
Winter of 2002 that investigated these wave-particle correlations and we are
currently analyzing the data from the flight.
We flew another rocket
in the Winter of 2003 to investigate particles and
waves above the Langmuir frequency. We flew another wave-particle correlator on the CHARM-2 rocket in the Winter of 2010. We will also fly this correlator in the Earth's cusp region in 4th quarter 2014 on the CAPER sounding rocket mission.
Extending outward from the auroral zone, we have electron and ion data
from the Hydra instrument
on the Polar satellite
which was just launched in February of 1996. By analyzing the particle
data from these missions (along with electric and magnetic field data taken
at the same time) we can infer characteristics of the processes that create
the aurora. I have been examining particle data for times when the Polar
satellite is at high altitude in the northern auroral zone. The satellite
is at sufficiently high altitude that one can be certain that it is above
the region in which auroral electrons are accelerated. This allows us to
probe the source populations for the aurora with good resolution. Currently,
I am working on correlations studies to determine which (if any) solar
wind parameters are correlated with the characteristic energy and density
of the auroral source population.
I am also involved in an exciting new technique to measure electric
fields in space using electron beams. An experiment using this technique
was flown on a German-Swedish satellite called Freja
which was launched in October of 1992 from China. The focus of this mission
was also auroral physics and we were able to demonstrate that this new
technique works quite well. In particular the technique allows a full vector
determination of the electic field perpendicular to the background magnetic
field. This is not always possible with other techniques and thus this
new method provides a complement to existing techniques. Now that the method
is validated we are concentrating our efforts on using this data to better
understand auroral electrodynamics.
Another implementation of this technique that will flown on the Equator-S
satellite to be flown in the next year. Originally this experiment was
to be flown on the four Cluster spacecraft. Unfortunately these spacecraft
were destroyed when their launch vehicle (the Ariane 5) exploded shortly
after launch. Happily, both NASA and the European Space Agency decided
to rebuild all four spacecraft (called Cluster-II)
and they were successfully launched in the summer of 2000. This version
is substantially more complicated than the Freja version, but promises
to allow determination of the electric field in regions in which other
Alfven Waves and Acceleration of Electrons
- Chen, L., C. A. Kletzing, S. Hu, and S. R. Bounds, Auroral electron dispersion
below inverted-V energies: Resonant deceleration and acceleration
by Alfven waves, J. Geophys. Res., 110, A10S13, doi:10.1029/2005JA011168, 2005.
- C. A. Kletzing, S. R. Bounds, J. Martin-Hiner, W. Gekelman, and C. Mitchell,
Measurements of the shear Alfven wave dispersion for finite perpendicular
wave number, Phys. Rev. Lett, 10.1103/PhysRevLet.90.0350004, 2003.
- C. A. Kletzing and S. Hu, Alfven Wave Generated Electron Time Dispersion,
Res. Lett., 28, 693, 2001.
K. Stasiewicz, P. Bellan, C. Chaston, C. Kletzing, R. Lysak, J. Maggs,
O. Pokhotelov, C. Seyler, P. Shukla, L. Stenflo, A. Streltsov, and
J.M--E. Wahlund, Small Scale Alfvenic Structures, Space Sci. Rev., 92,
C. A., Electron Acceleration by Shear Alfven Waves in a Cylindrical Geometry,
poster presentation to IPELS '97 conference, July, 1997.
Kletzing, C. A., Sharp Boundaries and Dispersion of Inertial Alfven Waves,
suppl., 78, S269, 1997.
Kletzing, C. A., Electron Acceleration by Kinetic Alfven Waves, J.
Geophys. Res., 99 , 11095, 1994.
Electron Beam Electric Field Measurements
G. Paschmann, N. Sckopke, H. Vaith, J. M. Quinn, O. H. Bauer, W. Baumjohann,
W. Fillius, G. Haerendel, S. S. Kerr, C. A. Kletzing, K. Lynch, C. E. McIlwain,
R. B. Torbert, E. C. Whipple, EDI gyro time measurements on Equator-S,
Geophysicae, 17, 1513, 1999.
Kletzing, C. A., G. Paschmann, and M. Boehm, Electric Field Measurements
Using the Electron Beam Technique at Low Altitudes, in Measurement Techniques
in Space Plasmas, AGU Monograph Series, 103. 53, 1998
Kletzing, C. A., G. Paschmann, M. H. Boehm, G. Haerendel, N. Sckopke, W.
Baumjohann, R. B. Torbert, G. Marklund and P.-A. Lindqvist, Electric fields
derived from electron drift measurements, Geophys. Res. Lett., 21,
Plasma Sheet Physics from Polar
- C. A. Kletzing, J. D. Scudder, E. E. Dors, and C. Curto, The auroral source
region: plasma properties of the high altitude plasma sheet, J. Geophys.
J. Geophys. Res.,
108, 1360, doi:10.1029/2002JA009678, 2003.
- J. R.Wygant, A. Keiling, C. Cattell, R. L. Lysak, M.Temerin, F. S. Mozer,
Russell, and C. A. Kletzing, Correlation of Alfven wave Poynting flux
plasma sheet at 4-7 RE with ionospheric electron energy flux, J. Geophys.
Res., 107, 2002.
A. Keiling, J. R. Wygant, C. Cattell, M.Temerin, F. S. Mozer, C. A. Kletzing,
J. Scudder, C. T. Russell, Properties of large electric fields in the plasma
sheet at 4M--7 RE measured with Polar, Geophys. Res., in press,
A. Keiling, J. R. Wygant, C. Cattell, M.Temerin, F. S. Mozer, C. A. Kletzing,
J. Scudder, C. T. Russell, W. Lotko, and A. Streltsov, Large Alfven wave
power in the plasma sheet boundary layer during the expansion phase of
substorms , Geophys. Res. Lett., 27, 3169, 2000.
J. R. Wygant, A. Keiling, C. A. Cattell, M. Johnson, R. L. Lysak, M. Temerin,
F. S. Mozer, C. A. Kletzing, W. Peterson, C. T. Russell, G. Parks, M. Brittnacher,
Polar Spacecraft Based Comparisons of Intense Electric Fields and Poynting
Flux Near and Within the Plasma sheet - Tail Lobe Boundary to UVI Images:
An Energy Source for the Aurora, J. Geophys. Res., 8, 18675, 2000.
Kletzing, C. A., and J. D. Scudder, Auroral-Plasma Sheet Electron Anisotropy,
Res. Lett,, 26, 971, 1999.
Cattell, C. A., J. Dombeck, J. R. Wygant, M. K. Hudson, F. S. Mozer, M.
A. Termerin, W. K. Peterson, C. A. Kletzing, C. T. Russell, and R. F. Pfaff,
Comparisons of Polar satellite observations of solitary wave velocities
in the plasma sheet boundary and the high altitude cusp to those in the
auroral zone, Geophys. Res. Lett., 26, 425, 1999.
Other Polar Science
Toivanen, P. K. , Baker, D. N. , Peterson, W. K. , Singer, H. J. , Turner,
N. E. , Li, X. ; Kauristie, K. , Syrjasuo, M. ,Viljanen, A. , Pulkkinen,
T. I. , Keiling, A. , Wygant, J. R. , Kletzing, C. A. 2001Reconciliation
of the substorm onset determined on the ground and at the Polar spacecraft
Geophys. Res. Lett. 28, 107, 2001
- Kletzing, C. A. and L. Muschietti, Phase correlation waves, in ”Geospace Radiation
and Plasma Waves”, J. LaBelle and R. A. Treumann, eds., Springer-Verlag, 2006.
- C. A. Kletzing, S. R. Bounds, J. LaBelle, and M. Samara, Observation of the
reactive component of Langmuir wave phase-bunched electrons, Geophys.
Res. Lett., 32, L05106, doi:10.1029/2004GL021175, 2005.
- M. Samara, J. LaBelle, C. A. Kletzing, S. R. Bounds, Rocket observations of
structured upper hybid waves at fuh = 2fce, Geophys. Res. Lett.,31, doi:
- D.Schriver, M. Ashour-Abdalla,R. J. Strangeway,R. L.Richard, C. Kletzing,
Y. Dotan, J. Wygant, FAST/Polar conjunction study of field-aligned auroral
acceleration and corresponding magnetotail drivers, J. Geophys. Res.,108,
8020, 10.1029/2002JA009426, 2003
Dors, Eric E., and C.A. Kletzing, Effects of Suprathermal Tails on Auroral
Electrodynamics, J. Geophys. Res., 104, 6783, 1999..
Kletzing, C. A., F. S. Mozer, R. B.
Torbert, Electron Temperature and Density at High Latitude, J. Geophys.
Res., 103, 14837, 1998
Mozer, F. S. and C. A. Kletzing, Direct observation of large, quasi-static,
parallel electric fields in the auroral acceleration region, Geophys.
Res. Lett., 25, 1629, 1998.
Kletzing, C. A., G. Berg, M. C. Kelley, F. Primdahl, and R. B. Torbert,
The electrical and precipitation characteristics of morning sector S un-aligned
auroral arcs, J. Geophys. Res., 101, 17175, 1996
G. A. Berg, M. C. Kelley, M. Mendillo, R. Doe, J. Vickrey, C. Kletzing,
F. Primdahl, and K. B. Baker, Formation and eruption of Sun-aligned arcs
at the polar cap-auroral oval boundary, J. Geophys. Res., 99, 17577,
C. A. Kletzing and R. B. Torbert, Electron Time Dispersion, J. Geophys.
Res., 99 , 2159, 1994 .
J. C. Williamson, R. O. Torres-Isea, and C. A. Kletzing, Analyzing Linear
and Angular Momentum Conservation in Digital Movies of Puck Collisions,
J. Phys., 68, 841, 2000.