تحليل التباين لنماذج تقدير قيم الترددات الحرجة لطبقة E الايونوسفيرية وتغيراتها باختلاف النشاط الشمسي لمينة بغداد

In this $ork an anall'sis for critical hourll frequcncies E lryer at Baghdad for thrccmorlcls hlvc bccn choscn, tlvo dfl)-s during yeur 2000 (high solar actiYit)) and hvo drystlrrring 1996 (lorv solirr rctilin). The three sanrples lthich had used arc, thc first is thenrcirsured local vxlucs b! Ionosond, lhc secon(l is D:lyies }Iodcl and thc third is IRI NIo(lcl.Conrp risons lrchreen the three sxmplcs hirve been done during these days. Res lts shorrthtlt the comnron populrltion estimites for the three sanlples n ls nearly thc same for da1'sof high solnr activitv but dcfer from erch othcr during days of lorv solar activity ryhere IltlNIodcl cstimatcs tends to bc rclativcly lorv.