This is Ephemeris for Friday, June 28th. Today the Sun will be up for 15 hours and 32 minutes, setting at 9:32, and it will rise tomorrow at 6:00. The Moon, at last quarter today, will rise at 1:37 tomorrow morning.
Tomorrow, Saturday, June 29th there will be solar viewing at the Sleeping Bear Dunes National Lakeshore, at the Dune Climb from 3 to 6 PM. Park Rangers will be joined by members of the Grand Traverse Astronomical Society with their specially filtered telescopes to view the Sun safely. This is a period of great solar activity. Remember the Aurora Borealis of a few weeks ago. Solar filtered telescopes will safely view the surface of the sun, called the photosphere and sunspots, while the society also has two special solar telescopes with which to view the layer of gas above the surface called the chromosphere and prominences which look like flames coming off the chromosphere. This is one of two solar observing opportunities this summer.
The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EDT, UT–4 hours). They may be different for your location.
Addendum
The white light Sun as of Thursday gives us a preview of what it will look like on Saturday. Most solar telescopes we use will give a mirror image. The sunspots will move and change from Thursday’s appearance, seen here. White light filters generally give the Sun an orange hue. It’s really white. Credit: NASA/Solar Dynamics Observatory.
The Sun in the light of hydrogen taken late Thursday our time (11:16 pm). The color is truly red in this photograph and in our hydrogen alpha solar telescopes. The alpha radiation of hydrogen is in the red part of the spectrum. What we are looking at is the chromosphere was a which is a layer of gas above the photosphere, which is the bright ball of the Sun that we see through white light telescopes. It gives us a very different view of the Sun which is much less smooth and with a lot of detail. The dark clouds over the photosphere are called filaments and if they were at the edge of the Sun we’d see them as bright features called prominences, though dimmer than the chromosphere which is why they appear dark when silhouetted over the chromosphere. The bright areas are called pledges and are magnetically active areas as are the sunspots. These are areas which may produce sunspots later. The chromosphere changes a lot more than the white light Sun and its sunspots. Credit: NISP / Learmouth, Australia.
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