کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1764820 | 1020073 | 2013 | 17 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Variations in statistical parameters of the NmF2 equinoctial asymmetry with latitude and solar activity near noon Variations in statistical parameters of the NmF2 equinoctial asymmetry with latitude and solar activity near noon](/preview/png/1764820.png)
Hourly values of the F2-layer peak density, NmF2, measured by 95 ionosondes near noon from 1957 to 2011 at low and middle geomagnetic latitudes of the northern and southern geographic hemispheres are used in a statistical study of the NmF2 equinoctial asymmetry. The ratios, R, of NmF2 measured during 61 days around the March equinox to NmF2 measured during 61 days around the September equinox at the same UT near noon during geomagnetically quiet daytime conditions for approximately the same solar activity conditions over the same ionosonde are analyzed. The conditional probability of the occurrence of R in an interval of R, the most probable value of R, and the mean expected value of R are calculated for the first time for the low, moderate, and high solar activity levels to study variations in these statistical parameters with latitude and solar activity. These statistical parameters are averaged over 5° geomagnetic latitude interval in the northern and southern geographic hemispheres to calculate and to study for the first time trends in latitude and solar activity of these averaged NmF2 equinoctial asymmetry statistical characteristics.
Journal: Advances in Space Research - Volume 51, Issue 11, 1 June 2013, Pages 2018–2034