Measurement of E-Layer Effective Recombination Coefficient During Solar Flares
Article first published online: 7 DEC 2012
Copyright 1972 by the American Geophysical Union.
Volume 7, Issue 4, pages 469–480, April 1972
How to Cite
1972), Measurement of E-Layer Effective Recombination Coefficient During Solar Flares, Radio Sci., 7(4), 469–480, doi:10.1029/RS007i004p00469., and (
- Issue published online: 7 DEC 2012
- Article first published online: 7 DEC 2012
- Manuscript Received: 9 SEP 1971
Simultaneous measurements of flare-enhanced electron density in the E layer and of flare-enhanced solar X-ray flux were used to evaluate the ionospheric relaxation time constant at E-layer heights. The method is an extension of Appleton's ionospheric “filter” idea to the case in which radiation flux and electron density fluctuations are simultaneously measured. Electron density measurements were made using the Thomson scatter technique at the National Astronomy and Ionosphere Center, Arecibo, Puerto Rico. X-ray flux data in the 2- to 12-Å band were obtained from instruments aboard the Explorer 33 satellite. Measured values of time constant were converted to an effective recombination coefficient using the familiar Appleton formula and known values of the ambient electron density. Values for the effective recombination coefficient of the order 10−7 cm3/sec were obtained at E-layer heights.