Measuring the filaments.

Today's Sol image revealed a beautiful snake like filament. 

It got me thinking... How long is that filament?

With the help of the laptop software, I decided to have a go at making a rough guess.

By placing a grid over today's Sol image I was able to "very" roughly figure out the filament length.

As the Sun is around 865,000 miles in diameter, and the grid took sixteen squares to cross the Sun's diameter I figured that each square was roughly 54,000 miles wide.  

865,000/16 = 54,062 miles.

The filament in question, down near the 5.00 clock position on the image easily stretched some two squares.

By my "very rough" reckoning today's filament was around 108,000 miles from end to end!

If you ever decided to walk the length of that filament, at a speed of five mile per hour, without stopping, it would take you just under two and a half years to reach the other end!

How long would it take to walk from one end of the Sun to the other end ? How long would it take to walk from the Sun to my back  garden? 

I think I'll leave these questions for another time.

........

After some photoshop tweaking of today's image I found a new way (for me) to display the solar detail. 

It needs further work to be of any use, though for now I am pleased with the results.

That snaking filament shows up much better in this new image format.

Summer Solstice Sun

HAPPY SUMMER SOLSTICE EVERYONE

Much cloud in evidence today, though a few gaps did occasionally appear.

The final image wasn't that brilliant, though it did allow for a few pictures with hints of plages and filaments.

Below is probably the best of the lot.

The view through the eyepiece was much better than the photographic image, filaments clearly showed better with the naked eye. 

Maybe I should try sketching some of those camera shy filament features...  I'll have a go soon.

Below is a sketch I made of a sunspot group, roughly ten years ago! I have the date somewhere, now lost in the labyrinth of my external hard drive.

The observation was made with my old 110mm reflector, mylar filter and a 12mm eyepiece.

It goes to show solar observing doesn't require huge apertures to be fun.

Where are the Noctilucent clouds?

So far this month I haven't spotted a single Noctilucent Cloud.

Looks like ten years ago I was saying the same thing. 

Here's one of my old blog posts from "ten" years ago today!

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Tuesday, 18th June 2013

Night time Daylight - NO NLC

Saturn has finally disappeared behind some rather large ash trees at the end of my neighbour's garden..

Not much astro activity at the moment, these past few evenings have been spent spying the waxing moon and glimpsing the odd double star through my powerful 40mm refractor. 

It's such a small scope, but it's fascinating to see how much of the night sky it can reveal. 

Here's an afocal image of the Moon from a few nights ago.. taken with the tiny 40mm refractor.

afocal image: 40mm "Leviathan" refractor.

Still no Noctilucent cloud sightings. 

It helps that the street lights to the North of our property now switch off after midnight. 

The picture below was taken a couple of evenings ago, at about 11.30pm. 

You could easily be fooled into thinking it was 11.30 am. 

Thanks to the county wide streetlight switch off, I now stand a better chance of seeing those beautiful ethereal Noctilucent Clouds "NLC".

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https://earthsky.org/earth/night-shining-clouds-noctilucent-clouds-how-they-form-how-to-see-them