Effect of the solar eclipse of 22 July 1990 at mid-latitude path of HF propagation

✍ Scribed by V.A. Ivanova; N.V. Ryabova; V.V. Shumaev; V.P. Uryadov; V.E. Nosov; I.G. Brinko; N.S. Mozerov

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 207 KB
• Volume: 60
• Category: Article
• ISSN: 1364-6826
• DOI: 10.1016/s1364-6826(98)00043-1

✦ Synopsis

Observational results obtained during the solar eclipse of 11 July 0889 using the oblique sounding method for a mid! latitude\ Irkutsk to Nizhny Novgorod path are presented[ A chirp sounder with high time delay and frequency resolution was used in the measurements[ The electron density pro_le for the mid!point of the path was restored using the reduction method[ It is shown that\ during the solar eclipse with maximum obscuration ½69)\ the electron density in the F! region decreased by 5Ð7) compared with control day values[ Travelling ionospheric disturbances caused by the eclipse! generated acoustic gravity waves were detected[ Strong variations in the di}erence group delays "Dt# between the high! angle and low!angle rays with a period ½39 minutes associated with the start and end of the eclipse\ were found[ The vertical component of the disturbance speed determined from the time delay oscillation\ Dt\ relative to the eclipse start for the ozone layer "near an altitude of 34 km# of the sub!ionospheric point for the 0F1 mode re~ection reaches a value ½129 m:s[ Þ 0887 Elsevier Science Ltd[ All rights reserved[