This study explores the relationship between the sunspot number (SSN) and the ionospheric foF2. It is of interest to locate the SSN value at which the foF2 values are saturated. A regression model is built based on the data of the strictly rise period of the 21st solar cycle recorded by eight ionosonde stations scattering roughly between 40°N and 40°S geomagnetic latitude. Results show that clear saturation features appear around the equatorial anomaly crest region. (C) 2000 Elsevier Science Ltd. All rights reserved.
|頁（從 - 到）||359-362|
|期刊||Physics and Chemistry of the Earth, Part C: Solar, Terrestrial and Planetary Science|
|出版狀態||已出版 - 2000|