Thursday, December 26, 2013
Back on November 8th huge sunspot area 1890 had rotated to the center of the Sun's disk. In spite of the cold morning and low altitude of the Sun, I decided to set up my telescope to capture the best sunspot in quite a while. It wasn't long before the train wreck started.
First, I had forgotten about the change from daylight savings time to standard time. I thought I was setting up with plenty of time before the Sun would be blocked by an obscuring tree. In fact, I was an hour late. When I was ready to get the first image, the Sun just started passing behind the tree! So I had to wait an hour and 20 minutes before the Sun emerged clear of the branches. I then managed to quickly capture four video clips before the next problem popped up: the communication link between the telescope and the computer broke. By the time I reestablished communication, the seeing conditions had deteriorated significantly. The Sun's surface was swimming around and tremendously blurred. I waited a while for the atmosphere to settle, but soon noticed clouds moving across the Sun. I looked up from the computer to see many clouds moving in from the west. At this point I had spent about 3.5 hours trying to image the Sun and obtained only four images for my efforts. It was time to give up.
When I later examined the four images, only one was reasonably sharp. Sunspot 1890 was really spectacular a few days earlier. I couldn't capture its full glory then because it was cloudy. Just my luck. Here's the one decent picture I captured of sunspot 1890 with a 2X Barlow. Click on the image for a larger view.
This sunspot had a complicated structure with many small sunspots trailing the largest one. The smaller spots showed up much better in ordinary white light than they did in the hydrogen-alpha image above.
Observing season has ended for the year. Next year I'll observe from a new improved location free from obscuring trees and buildings which have plagued me in the past.
Wednesday, December 18, 2013
Back in October it seemed like a long time since the Sun displayed significant features. More than a month had passed since my last solar observing session in September. When some cool clear weather finally arrived on October 20th, I was ready to image a variety of sunspots and filaments spread over the eastern half of the Sun.
The following 8-image mosaic, made with a 1.5X Barlow lens, shows features on the Sun's east side. Large sunspot 1877 is in the lower left, and smaller sunspot 1872 is on the lower right near the image edge. Sunspot 1875 is a pair below the two nearly parallel dark filaments. Sunspot 1873 is the white area near the center accompanied by a c-shaped structure. Click on the image for a larger view.
The biggest sunspot, 1877, with interesting activity to its left, is shown in more detail below.
The other sunspots, 1875 and 1873, are shown in the next image. 1875 has a double structure below center. 1873 is smaller and dispersed to the upper right accompanied by a c-shaped structure. I experimented with a new pale blue color in this image.
Filaments near sunspots 1875 and 1873 show nice "float" in the following inverted image.
Finally, I imaged two prominences. First, two dim, spike-like prominences are displayed below.
Another brighter prominence was also present.
Tuesday, December 10, 2013
In this final post about Iceland I'll return to my astronomical interests. On the morning and evening of October 4th I saw beautiful, dark, cloudless skies from our window at the Hotel Ranga. No auroras were in progress, but the dark sky was too inviting to ignore. I couldn't sleep during the predawn hours of the 4th, so I went out into the dark at about 4 am to try photographing constellations. To get outside I walked down this quiet deserted hallway in the rustic hotel.
On the way to the front exit I passed the enormous 10 foot high polar bear in the hotel lobby.
When my images are manipulated into the blog format the image quality seems to diminish. Full sized images look better than the compressed shrunken images appearing below. So, please click on each image below to get a better view. In the cold and dark before dawn I took this image of Aries, Triangulum, and Andromeda. The Andromeda Galaxy is barely visible slightly to the right of center.
Auriga, Perseus, and Cassiopeia are spread horizontally across the middle portion of the next image.
Next are Auriga, in the upper left, and the V-shape of Taurus, below center, including the star cluster called, The Pleiades, above and to the right of the "V".
By the time I swung around towards the south some clouds had begun to ruin the clear sky. The clouds have an orange glow in this picture of Orion and Taurus. Bright Jupiter appears on the extreme right edge of the image.
After a full day viewing waterfalls, a glacier, and a black sand beach on October 4th, the evening sky was dark and clear again. Once dinner ended I went out in front of the hotel to try capturing evening constellations. Our location at 64 degrees north latitude made Polaris, the North Star, 64 degrees above the horizon instead of 37.4 degrees above the horizon as it is at my home in Virginia. Here is a view looking north showing both dippers: Ursa Major, the Big Dipper, in the bottom center and Ursa Minor, the Little Dipper at top center. A dim companion of Polaris shows up in the image. Can you see it? Click on image for a larger view.
The dimmest stars in the image above are about magnitude 7.5. I expected to capture dimmer stars than that. The next image below shows Pegasus, the great square, on the right, and also Andromeda spread nearly horizontally across the center of the image. The Andromeda Galaxy is barely visible slightly above and slightly left of center.
All images above were captured with a tripod-mounted Nikon D40 camera with exposures of 30 seconds, ISO at 1600, and an 18 to 55 mm lens set at 18 mm.
We had a great time in Iceland!
Monday, December 2, 2013
We visited two impressive glaciers in Iceland and saw many more from a distance. I think the glacier below is the Myrdalsjokull Glacier, but I'm not completely certain. Hot springs beneath the glacier contribute to its melt water.
The end of the glacier displayed cave-like melting features like these.
The glacier produced a melt lake shown in the following wide angle mosaic. Click on the image below for a bigger picture.
We also visited the Eyjafjallajokull Glacier, shown in the next picture, during our trip to the Thorsmork Nature Reserve. The glacier descends from the Eyjafjallajokull volcano, the famous "unpronounceable" volcano, which severely disrupted air traffic when it erupted in 2010. The glacier is pronounced: AY-uh-fyat-luh-YOE-kuutl-uh. That helped, didn't it? Our guide easily pronounced it over and over during the tour. I gave up. I still can't get the hang of it.
The 2010 eruption caused the collapse and catastrophic draining of a large glacial melt lake, now seen as the empty gray foreground area in the picture below.
We also visited a beautiful black sand beach near the small village of Vik. The "sand" we walked on looked like this.
I was fascinated by the spectacular basalt column cave which I tried to capture in photos. The cave had a silvery interior glow not apparent in many of my photos. I found the basalt structures and cave so enthralling that I spent little time photographing the shoreline or the rock formations offshore. After a while foggy mist rolled in from the sea hiding the offshore rock formations. Birds soared overhead. Our guides said we had the best conditions they had ever seen - no strong winds, or huge dangerous waves at the time of our visit.
The first picture below, a wide angle mosaic, shows the basalt column complex surrounding the dark cave in the middle, but it doesn't show the glow within the cave. Click on the image for a larger view.
The next wide angle mosaic does a better job of depicting the illuminated cave. Click on the image for a larger view.
Here is a closer look at the basalt columns to the left of the cave.
And here are the columns to the right of the cave.
Looking above the view in the previous picture revealed a multitude of tilted columns.
Check out these strange formations near the base of the cliffs.
My last Iceland post will come next week.
People say I'm crazy doing what I'm doing
Well they give me all kinds of warnings to save me from ruin
When I say that I'm o.k. well they look at me kind of strange
Surely you're not happy now you no longer play the game
People say I'm lazy dreaming my life away
Well they give me all kinds of advice designed to enlighten me
When I tell them that I'm doing fine watching shadows on the wall
Don't you miss the big time boy you're no longer on the ball
I'm just sitting here watching the wheels go round and round
I really love to watch them roll
No longer riding on the merry-go-round
I just had to let it go