Evidence for Velocity Dispersion in Auroral Electrons

  title={Evidence for Velocity Dispersion in Auroral Electrons},
  author={Donald A. Bryant and Henry L. Collin and G. M. Courtier and Alan D. Johnstone},
THE intensities of 10 keV and 4 keV electrons have been measured from a sounding rocket launched into a post-breakup aurora. Pulsations in electron intensity were observed with a period of about 4 sec at both energies. The 10 keV pulsations occurred about half a second earlier than those at 4 keV. These results could have been caused by temporal changes in electron intensity and by a spatial structure in the path of the rocket because the causes are indistinguishable in the data. We treat the… 
Parallel electric fields inferred during a pulsating aurora
A sounding rocket, equipped to study pulsat- ing aurora launched from Poker Flat, Alaska on 13 March 1997 at 10:20:31 UT, measured electron precipitation over the range 10 eV to 500 keV covering
Correlation study of auroral luminosity and X rays
Simultaneous observations of λ5577 O I and X-ray bremsstrahlung reveal that postbreakup quasiperiodic 5- to 15-sec pulsations in these two phenomena are positively correlated. Cross-correlation
A 2.2-Hz modulation of auroral electrons imposed at the geomagnetic equator
The direct observation of high frequency ∼3 Hz modulation of electron intensities during pulsating aurora is comparatively recent although, from TV and photometric studies, modulation of the visual
Inverse electron energy dispersion from moving auroral forms
Numerous published examples of energy‐dispersed bursts show electron energies reaching as high as several keV and decaying to lower energies over a fraction of 1 s. This signature has been
Energy spectra and angular distributions of particles in the plasma sheet and their comparison with rocket measurements over the auroral zone
This paper presents examples of electron and proton differential energy spectra between ∼100 ev and 18 kev measured with hemispherical plate electrostatic analyzers on the Vela satellites at a
Electron time dispersion
Observations of electrons during a sounding rocket flight from Sondrestromfjord, Greenland, in 1985 showed numerous instances of electron time-of-flight dispersion, that is, a coherent structure in


Observations on pulsating auroras.
Observations on pulsating auroras occurring near the equatorward boundary of auroral displays during their postbreakup phase have been made with an image orthicon television system and with
Time sequences and spatial relations in auroral activity during magnetic bays at College, Alaska
At College (Fairbanks), Alaska, simple magnetic disturbances of negative bay type are closely related to a sequence of change in the type of auroral activity. General features of the relationship