72 citations · 521 across the 25 of their papers we have counts for
4 papers · 1 filter
Critical frequencies of the ionospheric and layers during the last four solar cycles: sunspot group type dependencies
Erdal Yiğit, Ali Kilcik, Ana Georgina Elias +4
The long term solar activity dependencies of ionospheric F and F regions' critical frequencies ( and ) are analyzed for the last four solar cycles (1976--20…
The ratio between the number of sunspot and the number of sunspot groups
K. Georgieva, A. Kilcik, Yu. Nagovitsyn +1
Data from three solar observatories, Learmonth, Holloman, and San Vito, are used to study the variations in the average number of sunspots per sunspot group. It is found that the d…
Temporal and Periodic Variations of Sunspot Counts in Flaring and Non-flaring Active Regions
A. Kilcik, V. Yurchyshyn, B. Donmez +3
We analyzed temporal and periodic behavior of sunspot counts (SSCs) in flaring (C, M, or X class flares), and non-flaring active regions (ARs) for the almost two solar cycles (1996…
About the recalibration of the sunspot record
Katya Georgieva, Ali Kilcik, Yury Nagovitsyn +1
In 2015 the calculation of the International (Zurich) sunspot number was cancelled, and it was replaced by a new "recalibrated" series. A new data series was proposed also for the…