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portrait flag Dr. Hans Stenbaek-Nielsen,
Geophysical Institute, University of Alaska Fairbanks

E-mail: hnielsen [at]

Brief Biographical Information:

Professor of Geophysics, University of Alaska.
Royal Technical University of Denmark '65, M.Sc.


Professor Nielsen has a research background in auroral and magnetospheric physics. At the institute, he has worked mainly in auroral research. During the last 10 years, he has been engaged in chemical release experiements, notably the barium shaped-charge program, and in sprite and auroral work. Professor Nielsen also is teaching graduate and undergraduate courses within the Department of Physics.

meteor at 1000 frames/s

Sequence of three images from a 1000 frames per second video taken of a -3 magnitude Leonid meteor in 2001. For the first time, an extended halo and a shock-like phenomenon was observed that could not be a blast wave. More information here.

Research on Leonid MAC:

First high-frame rate imaging of meteors using a digital, low-light-level, 1000 frame per second intensified CCD imager developed by the Geophysical Institute, University of Alaska Fairbanks. The digital images are 256x256 pixels at 8 bit (256 gray levels) and the field of view is 6.4x6.4 degrees. The instrument responds to light at wavelengths 500-900 nm with maximum sensitivity at 700 nm. Discovery of a halo and shock-like phenomenon.

Research on Hyperseed MAC:

High-framerate imaging to observe rapid light variations and phenomena in the wake of the sample return capsule in an experiment with Geoff Mcharg.