تقدير دوران الشمس التفاضلي باستخدام أرصاد البقع الشمسية التابعة لجامعة الملك عبد العزيز

Abstract EN

Here we describe in detail the way to estimate the differential solar rotation rate using sunspots observations.

Measurements of sunspots (position and area) have been started at King Abdulaziz University Solar Observatory (KAAUSO) since 1985.

We used signal spots which have lived for more than five days, so 300 single spots have been selected out of 950.

Based on these measurements the differential solar rotation rate for all sunspots for the whole interval, 19851999, have been determined to be Ω= 14.11 - 3.15 sin2 ø (deg/day), where f is the latitude on the solar surface.