THE TROUGH SEEN IN HIGH LATITUDE OBSERVATIONS OF THE IONOSPHERIC ELECTRON CONTENT

• Main Author: Liszka,Ludwik
• Other Authors: KIRUNA GEOPHYSICAL OBSERVATORY (SWEDEN)
• Format: Text
• Language: English
• Published: 1967
• Subjects: Atmospheric Physics; (*IONOSPHERE; *ELECTRON DENSITY); POLAR REGIONS; ATMOSPHERIC SOUNDING; RADIO BEACONS; SCIENTIFIC SATELLITES; PERIODIC VARIATIONS; DIURNAL VARIATIONS; THICKNESS; GEOMAGNETISM; PHOTOELECTRONS; HEATING; SWEDEN; Kiruna
• Online Access: http://www.dtic.mil/docs/citations/AD0650623; http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0650623

Results of 15 months observations of the ionospheric electron content made at Kiruna, Sweden are presented. Observations were made using the 40 and 41 MHz beacon of the S-66 satellite. Most of the night-time observations, except for the summer period, show a distinct trough in the electron content. Seasonal and diurnal variations of the trough and of the electron content are studied. Also the corresponding equivalent slab thickness obtained using foF2 data from 6 Scandinavian ionosondes and geomagnetic control of the trough are investigated. Some features of the diurnal variation of electron content during the summer agree with the hypothesis of ionospheric heating by photoelectrons from the sunlit magnetic conjugate ionosphere. (Author)