Download or read book Variations in Frequency of Occurrence of Sporadic E, 1949-1959 written by W. B. Chadwick and published by . This book was released on 1961 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: The question of the dependence of sporadic E on the sunspot cycle has largely been unresolved, with many investigators obtaining conflicting answers. In this report results are given covering daily-hourly values of fEs for eleven years at three ionosphere sounding stations, College, Washington, and Huancayo, chosen as representative of the three main sporadic-E zones. These stations experienced a minimum equipment changes and changes of location during this period. Scaling procedures were monitored over the eleven years by a data quality-control group at the National Bureau of Standards. The period included the highest average sunspot number for over 200 years.