Here are today’s solar images taken from Al Sadeem Observatory, May 18, 2021.
The sky was clear with moderate breeze which provided good transparency but average seeing at the time these images were taken.
A new huge unipolar sunspot group AR2824 (Modified Zurich/Mcintosh sunspot configuration: Hsx/alpha) has rotated into Earth-view from the NE limb and has been producing a couple of minor C-class solar flares over the past 24 hours. Meanwhile, the smaller bipolar sunspot group AR2823 (Hsx/alpha) remained quiet and stable. The latest sunspot number (based on visual count and Wolf number calculation) is 24.
Nothing much significant going on with the Sun lately aside from enhanced plages associated with the upper-mentioned sunspot groups and a few small quiescent and moderately huge prominences, particularly an eruptive loop one at the SW limb as distinctively captured in H-alpha imagery.
Space weather agencies* forecast solar activity to be at very low levels with chances of solar flares of B-class to C-class intensity, from these active regions in the next few days. Close monitoring is being conducted by numerous space weather agencies for any significant development.
Equipment used are Skywatcher 120mm refractor telescope with Baader filter and unmodified Canon EOS 1D Mark IV DSLR camera for visible imagery. For H-alpha imagery, the equipment used are Lunt 60mm H-alpha solar telescope, and QHYCCD 290III mono camera; all mounted on Skywatcher EQ6 pro mount Pre-processing of visible solar images was performed in PIPP, stacking in Autostakkert, slight wavelet adjustments in Registax 6, and post-processing in Adobe Photoshop CC.
*TECHNICAL REPORTS COURTESY OF SOLAR INFLUENCE DATA CENTER (SIDC), NOAA-SPACE WEATHER PREDICTION CENTER (NOAA-SWPC)
Weather Data (5:10 PM – 5:35 PM, May 18, 2021, from NCM Al Wathba Station):
Average Temperature: 41.3°C
Average Humidity: 16.0%
Average Wind Speed and Direction: 25.75 kph from NNW
Average Cloud Cover: 0%
Average Air Pressure: 991.75 hPa
Average Solar Radiation: 216.5 W/m^2