Conjugate observation of electron microburst groups by bremsstrahlung X ray and riometer techniques

Details Conjugate observation of electron microburst groups by bremsstrahlung X ray and riometer techniques Conjugate observation of electron microburst groups by bremsstrahlung X ray and riometer techniques

Dec 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85.6760s&link_type=abstract

Journal of Geophysical Research, vol. 85, Dec. 1, 1980, p. 6760-6768. Research supported by the University of Maryland

Physics

1

Bremsstrahlung, Electron Precipitation, Polar Substorms, X Ray Analysis, Antarctic Regions, Arctic Regions, Correlation, Electromagnetic Absorption, Riometers

Scientific paper

The first evidence is reported of simultaneous conjugate electron microburst group precipitation. Groups of bremsstrahlung X-ray microbursts (energy greater than 25 keV) were observed during a substorm recovery phase by a balloon-borne scintillation counter over Roberval, Quebec, Canada. The microburst groups were accompanied one-to-one by time-delayed and broadened pulses of ionospheric absorption measured by a high sensitivity 30-MHz riometer at Siple Station, Antarctica (L approximately 4.1). For the interval of highest correlation, the absolute lag between the two data sets was 4 + or - 1 sec to the limit of the relative timing accuracy. Approximately 2 sec of the observed lag had been introduced by a low-pass filter in the riometer data acquisition unit. The remainder was due to the ionospheric recombination process which evidently had a response time (approximately 5 sec) during this event much shorter than that ordinarily associated with the D region of the ionosphere. Model calculations of the ionospheric response to time-varying precipitation, derived from the profile of the measured X-ray flux, provide a consistent picture of simultaneous microburst group precipitation at conjugate points, absolute absorption and the electron spectrum derived from X rays, the degree of variation in absorption and X-ray fluxes, and the characteristic ionospheric time constant at the altitude of maximum energy deposition.

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