Here are today’s solar images taken from Al Sadeem Observatory, April 16, 2019.
The sky was clear with light air turbulence making the seeing and transparency good at the time these images were taken.
The lone visible sunspot group AR2738 (Modified Zurich/Mcintosh sunspot configuration: Hhx/alpha) exhibited little to no change in sunspot structure, retaining its large leader spot, and was relatively inactive over the past 24 hours. It only produced a single minor B3-class solar flare, based on space weather agency records. No active sunspot regions currently exist on the Sun’s visible disk. The latest sunspot number (based on visual count and Wolf number calculation) is 11. Some huge eruptive and quiescent prominences, the scattered decaying plage associated with AR2738 were distinctively captured in H-alpha imagery.
Space weather agencies* forecast solar activity to remain at very low levels with chances of weak X-ray fluxes or flares ranging up to B-class (possibly up to isolated C-class) intensity, mainly from AR2738. The extent of the frequency and intensity of the Sun’s activity will highly depend on the magnetic flux fluctuations happening in the visible ARs in the coming 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 and Lunt H-alpha solar telescope and ZWO120MM CMOS camera for H-alpha imagery, mounted on Skywatcher EQ6 Pro. 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 (4:50 PM – 5:15 PM, April 15, 2019):
Average Temperature: 32.4°C
Average Humidity: 19%
Average Wind Speed and Direction: 22.93 kph from N
Average Cloud Cover: 0%
Average Air Pressure: 1000.33 hpa
Average Solar Radiation: 200.07 W/m^2
Average UV Radiation: 393 µW/m^2 (low)