Astrophotography – solar (Sun)

Sun 09/07/2018 – – – New facula

Yesterday, Spaceweather said:

“WHITE SUNSPOT: This weekend, observers of the sun have been waiting for something to emerge over the sun’s eastern limb. We knew it was there because of a farside solar flare on July 6th. Today it arrived, and it appears to be a white sunspot.

The correct name of this phenomenon is “faculae.” It is a cousin of sunspots.

Regular dark sunspots are magnetic islands on the surface of the sun. Magnetic fields in these areas are thousands of times stronger than Earth’s magnetic field. Sunspot magnetic fields are so strong, they block the flow of heat from the nuclear furnace below. They appear dark because they are relatively cool compared to their surroundings.

Faculae are also made of magnetic fields. However, the magnetism of faculae is concentrated in much smaller bundles than in sunspots. Instead of blocking heat from below, they essentially form corridors that allow us to see into sun’s hot interior, creating an apparent bright spot on the surface of the sun.

It is still possible that a dark core will follow these faculae over the limb in the hours ahead, establishing the region as a normal sunspot group. Stay tuned.” 

 

This is what it looked like this morning.

Nice prominences and “filaprom” too.

For some reason, I reckon this one looks better in colour.

Sun report 03/07/2018

Some filaments and nice prominences today.

As explained in a recent email dialogue,

The Lunt LS35 is tilt tuned and you can alter the emphasis twixt surface features and prominences by adjusting the (un-calibrated) tuning wheel. This is true for visual use at least. I seldom do this, and when imaging it isn’t that sensitive as you can compensate with processing, as I showed at RAG on friday night. I don’t change it between the surface and prominence images. I seem to get results generally very similar to those on GONG, which is my yardstick. Mind you, with published Ha images, you often see “hair” around spots, but you NEVER see this on GONG, nor do I get it.

Solar Pillar – Sunday 24th June 2018

Three jpegs straight out of the camera.

Nikon D7000 (APS-C/DX) Nikon 70-200 f/2.8 VRII + 1.4x TC

ISO 100, 1/160 sec, f/5, focal length 100mm (150mm in 35mm terms)

9.47pm

 

ISO 100, 1/100 sec, f/5, focal length 100mm (150mm in 35mm terms)

9.56pm

 

ISO 100, 1/50 sec, f/5, focal length 100mm (150mm in 35mm terms)

10.05pm

 

Damian