Reader TTS

ABSTRACT A UNIQUELY intense pulsation of auroral-associated X rays, followed a solar cosmic flare in September 1966 and was detected by scintillation counters on a balloon platform at an

altitude of about 32 km (ref. 1). The X rays were strongly modulated with a period of 4–6 s. Figures 1 and 2 show a portion of the amplitude-modulated intensity, the ratio of intensities in

two neighbouring energy channels, the power spectrum for the X-ray intensity ratio, and the spectrum of intensity variations in the lower energy channel. It can be seen that the X-ray

spectrum hardens as the pulsations grow and then softens with the subsequent decay, and that there are two peaks in the X-ray power spectrum. Access through your institution Buy or subscribe

This is a preview of subscription content, access via your institution ACCESS OPTIONS Access through your institution Subscribe to this journal Receive 51 print issues and online access

$199.00 per year only $3.90 per issue Learn more Buy this article * Purchase on SpringerLink * Instant access to full article PDF Buy now Prices may be subject to local taxes which are

calculated during checkout ADDITIONAL ACCESS OPTIONS: * Log in * Learn about institutional subscriptions * Read our FAQs * Contact customer support SIMILAR CONTENT BEING VIEWED BY OTHERS

DETECTION OF LONG-LASTING AURORA-LIKE RADIO EMISSION ABOVE A SUNSPOT Article 13 November 2023 FINE STRUCTURE OF TYPE III SOLAR RADIO BURSTS FROM LANGMUIR WAVE MOTION IN TURBULENT PLASMA

Article 31 May 2021 OBSERVATION OF RAYLEIGH-LAMB WAVES GENERATED BY THE 2022 HUNGA-TONGA VOLCANIC ERUPTION WITH THE POLA DETECTORS AT NY-ÅLESUND Article Open access 20 November 2022

REFERENCES * Brown, R. R., and Weir, R. A. J., _geophys, Res._, 72, 5531–5536 (1967); J. atmos. terr. Phys., 29, 1611–1618 (1967). Article  ADS  Google Scholar  * Pfeffer, R. L. and

Zarichny, J., _Geofis. pura appl._, 55, 175–199 (1963). Article  ADS  Google Scholar  * Tolstoy, I., _J. acoust. Soc. Am._, 28, 1182–1192 (1956). Article  ADS  Google Scholar  * _Beta- and

gamma-ray spectroscopy_, (edit. by Siegbahn, K.), (Interscience, New York, 1955). * Procunier, R. W., _Geophys. J. R. astr. Soc._, 26, 183–189 (1971). Article  ADS  Google Scholar  * _ESSA

Technical Report WB_ 9, (US Dept Commerce, January 1969). * Baker, D. M., and Davies, K., J. _geophys. Res._, 73, 448–451 (1968). Article  ADS  Google Scholar  * Dobson, G. M. B., _Proc.

phys. Soc. Lon._, 43, 324 (1931). Article  ADS  CAS  Google Scholar  * Hering, W. S., and Morden, R., Jr., _US Air Force Cambridge Research Papers_, No. 162, (1965). Google Scholar  *

Bojkov, R. D. J., _Geophys._, 72, 5585–5593 (1967). Article  CAS  Google Scholar  * Mitra, D. K., _The upper atmosphere_, second ed. (The Asiatic Society, Calcutta, ). Download references

AUTHOR INFORMATION AUTHORS AND AFFILIATIONS * Stanford Research Institute, Menlo Park, California, 94025 A. F. WICKERSHAM JUN. Authors * A. F. WICKERSHAM JUN. View author publications You

can also search for this author inPubMed Google Scholar RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE WICKERSHAM, A. Sound wave modulation of auroral X

rays. _Nature_ 249, 538–540 (1974). https://doi.org/10.1038/249538a0 Download citation * Received: 31 December 1973 * Issue Date: 07 June 1974 * DOI: https://doi.org/10.1038/249538a0 SHARE

THIS ARTICLE Anyone you share the following link with will be able to read this content: Get shareable link Sorry, a shareable link is not currently available for this article. Copy to

clipboard Provided by the Springer Nature SharedIt content-sharing initiative