Collision frequencies in the D-region

✍ Scribed by R. Vuthaluru; R.A. Vincent; D.A. Holdsworth; I.M. Reid

• Book ID: 104407436
• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 335 KB
• Volume: 64
• Category: Article
• ISSN: 1364-6826
• DOI: 10.1016/s1364-6826(02)00220-1

✦ Synopsis

Partial re ection di erential absorption and di erential phase observations have been used to systematically study collision frequencies ( ) in D-region of the lower ionosphere. The observations made with the large MF radar located at Buckland Park (35 • S; 138 • E) near Adelaide in the period September 1996 -December 2000 show values larger than predicted by previously used models. The new estimates are compared with values calculated using new collision frequency momentum cross-sections for N2( ) measured in the laboratory. The two types of measurements are found to be in good agreement, with a moderate seasonal variation of at a constant height. No change due to solar cycle variations is found.