Correction to paper by Pierre Kaufmann and Aracy M. Mendes, ‘Relative changes on lower ionosphere conductivity gradients during SID events’

Kaufmann, P.; Mendes, Aracy M.

doi:10.1029/ja073i019p06404

Cited by 3 publications

(1 citation statement)

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“…The results were plotted in Figures 1, 2 and 3. The good agreement found is rather remarkable, if we consider that inaccuracies are present in the X-ray satellite measurements (Acton et al, 1963), as well as in the SPA effects measurements, specially when the Sun is at very large zenith distances (Chilton, Steele and Norton, 1963;Kaufmann and Mendes, 1969).…”

Section: Correlation Between X-ray Intensities and Spa At Vlfmentioning

confidence: 57%

Some relationships between solar X-ray bursts and SPA's produced on VLF propagation in the lower ionosphere

Kaufmann

Barros

1969

Sol Phys

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Abstract. This paper discusses SPA's measured at long VLF propagation paths in the lower ionosphere and their association with soIar X-ray bursts observed by USNRL satellites in the 0-3 A, 0-8 A_ and 8-20 ~ bands. Excellent correlations were found between the SPA importances (in degrees per Mm) and the logarithm of the X-ray burst peak intensities. A hardening of the X-ray burst spectra is evident for increasing importance of SPA's; the threshold energy required for the occurrence of such anomalies was estimated, it is 4.3 × 10 -5 ergs cm -2 sec -1 in the main ionizing band of 0-3 A.. It was also possible to derive the effective recombination coefficient at the normal D-region height of 70 kin, this being c~r ~ 6 x 10 -6 cm 3 sec-1; furthermore ion production rates were estimated during SPA's at heights below the reference level.

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Section: Correlation Between X-ray Intensities and Spa At Vlfmentioning

confidence: 57%