Abstract
Geomagnetic micropulsations in the 0.005- to 1-cps frequency range were recorded at Kiruna, Sweden, in 1964 and 1965. At the same time, measurements of auroral X rays were performed by balloon-borne detectors from several stations in northern Scandinavia. A comparison of the micropulsation recordings with X-ray measurements showed a rather close connection between peaks of the X-ray intensity and the occurrence of irregular micropulsations from 1800 to 0600 LT but only a loose connection during the other half of the day. Several geomagnetic pulsation events of the Pc 1 type were also observed at times of enhanced X-ray flux. In two cases, variations of the X-ray energy spectrums were accompanied by frequency shifts of the Pc 1 micropulsations. Further, a special type of micropulsations occurring on slightly magnetically disturbed days was found. This type is characterized by sliding frequencies. Usually the frequency decreased from 0.05 to 0.01 cps in about 1 hour during the course of such events. This frequency shift is tentatively interpreted as being caused by a moving source of perturbations in the magnetopause.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
