Search Results - "Johnstone, A D"

The relativistic electron response in the outer radiation belt during magnetic storms by Iles, R. H. A., Fazakerley, A. N., Johnstone, A. D., Meredith, N. P., Bühler, P.

“…The relativistic electron response in the outer radiation belt during magnetic storms has been studied in relation to solar wind and geomagnetic parameters…”
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Statistical distributions of field-aligned electron events in the near-equatorial magnetosphere observed by the Low Energy Plasma Analyzer on CRRES by Abel, G. A., Fazakerley, A. N., Johnstone, A. D.

“…Low energy (≤100 eV–10 keV) field‐aligned electrons are often observed by the Low Energy Plasma Analyzer (LEPA) on the CRRES satellite. These electrons usually…”
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Simultaneous acceleration and pitch angle scattering of field-aligned electrons observed by the LEPA on CRRES by Abel, G. A., Fazakerley, A. N., Johnstone, A. D.

“…Using data from the Low Energy Plasma Analyzer we present detailed pitch angle versus energy electron distributions at the time of field‐aligned electron…”
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The turbulent state of cometary ion pickup generated fluctuations near comet P/Halley by Krauklis, I., Johnstone, A. D.

“…One of the principal effects of an outgassing comet is to introduce additional mass into the solar wind flow. This mass‐loading process results in the…”
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Acceleration of ionospheric O+ ions on open field lines in the low-latitude boundary layer and the cusp region by Krauklis, I., Johnstone, A. D., Peterson, W. K.

“…A common observation made by the toroidal imaging mass‐angle spectrograph on the polar orbiting Polar Spacecraft is the acceleration of ionospheric O+ and H+…”
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The effect of Poisson statistics on studies of turbulence in the solar wind by Johnstone, A. D., Krauklis, I. C.

“…Studies of Alfvén turbulence in the solar wind require the use of magnetic field and particle data. However, particle data is subject to a source of noise not…”
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PEACE: A PLASMA ELECTRON AND CURRENT EXPERIMENT by Johnstone, AD, Alsop, C, Burge, S, Carter, P J, Coates, A J, Coker, A J, Fazakerley, AN, Grande, M, Gowen, R A, Gurgiolo, C, Hancock, B K, Narheim, B, Preece, A, Sheather, PH, Winningham, J D, Woodliffe, R D

“…An electron analyser to measure the three-dimensional velocity distribution of electrons in the energy range from 0.59 eV to 26.4 keV on the four spacecraft of…”
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Cometary ion pickup processes: Halley and Grigg-Skjellerup compared by Johnstone, A.D.

“…After Giotto's encounters with two comets of quite different gas production rates we attempt to compare the results to see:- 1. a) to what extent theories…”
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Overlapping ion populations in the cusp: polar/TIMAS results by Trattner, K. J., Coates, A. J., Fazakerley, A. N., Johnstone, A. D., Balsiger, H., Burch, J. L., Fuselier, S. A., Peterson, W. K., Rosenbauer, H., Shelley, E. G.

“…The 90 degree inclined orbit of the Polar satellite crosses the cusp at intermediate altitudes (4RE–6RE). The Toroidal Imaging Mass‐Angle Spectrograph (TIMAS)…”
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Pulsating aurora by Johnstone, A. D

“…Pulsating aurora is a natural example of an important class of plasma phenomena--the loss of particles from confinement in a magnetic mirror. The loss process…”
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Low energy plasma analyzer by Hardy, D.A., Walton, D.M., Johnstone, A.D., Smith, M.F., Gough, M.P., Huber, A., Pantazis, J., Burkhardt, R.

“…The low energy plasma analyzer (LEPA) that operates in a direct wave-particle mode in which waves (below 30 kHz), measured by separate onboard electric field…”
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An investigation into the roles of ECH and whistler mode waves in the formation of “pancake” electron distributions using data from the CRRES satellite by Meredith, N.P., Johnstone, A.D., Szita, S., Horne, R.B., Anderson, R.R.

“…Electron pitch angle distributions sharply peaked at 90° pitch angle were first recorded in the energy range 50 eV < E < 500 eV by the GEOS-1 and GEOS-2…”
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An annular respirometer for measuring aerobic metabolic rates of large, schooling fishes by LUCAS, M. C, JOHNSTONE, A. D. F, TANG, J

“…Aerobic metabolic rates of fish at controlled levels of activity are usually measured with individual fish isolated in a flume-type respirometer, in which the…”
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Upstream migration of adult Atlantic salmon past a fish counter weir in the Aberdeenshire Dee, Scotland by Smith, I. P., Johnstone, A. D. F., Smith, G. W.

“…During their upstream migration through the lower reaches of the Aberdeenshire Dee, Scotland, radio‐tagged adult Atlantic salmon passed a Crump weir‐based fish…”
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Influence of geostationary spacecraft charging on measurements of low energy (0.05–20 keV) electron spectra by Popov, G.V, Degtjarev, V.I, Sheshukov, S.S, Johnstone, A.D

“…We find that the electron distributions measured from the Meteosat spacecraft in geosynchronous orbit have some characteristic spectral shapes associated with…”
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"Pancake" electron distributions in the outer radiation belts by Meredith, Nigel P., Johnstone, Alan D., Szita, Sarah, Horne, Richard B., Anderson, Roger R.

“…Electron pitch angle distributions sharply peaked at 90° pitch angle were first recorded in the energy range 50 eV < E < 500 eV by the GEOSl and GEOS2…”
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The February 1986 solar activity - A comparison of Giotto, Vega-1, and IMP-8 solar wind measurements with MHD simulations by Dryer, M., Smith, Z. K., Coates, A. J., Johnstone, A. D.

“…Large disturbances in the interplanetary medium were observed by several spacecraft during a period of enhanced solar activity in early February 1986. The…”
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UKS plasma measurements near the AMPTE artificial comet by Rodgers, D. J, Coates, A. J, Johnstone, A. D, Smith, M. F, Bryant, D. A, Hall, D. S, Chaloner, C. P

“…UKS observations of the ionized barium and disturbed natural plasmas 170 km from the center of the artificial comet release of Dec. 27, 1984, lasted over four…”
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The AMPTE UKS Three-Dimensional Ion Experiment by Coates, A. J., Bowles, J. A., Gowen, R. A., Hancock, B. K., Johnstone, A. D., Kellock, S. J.

“…This instrument measures the three-dimensional (3-D) distribution function of positive ions at the UKS. Novel electrostatic analyzers using 2600 turning angle…”
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Some auditory discrimination experiments on marine fish by Chapman, C J, Johnstone, A D

“…The ability of cod, Gadus morhua (L.), and haddock, Melanogrammus aeglefinus (L.), to discriminate changes in sound direction and amplitude was studied using a…”
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