ISWI Newsletter - Vol.5 No.51
25 April 2013

Dear ISWI Participant:

There are two items today.

FIRST NASA's SDO (Solar Dynamics Observatory) has been observing the sun for three years. Now, with this video, you can view all of it in just three minutes. It is a really beautiful video.

Some explanatory text for the video is as follows:

SDO's Atmospheric Imaging Assembly (AIA) captures a shot of the sun every 12 seconds in 10 different wavelengths, but the images shown here are based on a wavelength of 171 Angstroms, which is in the extreme ultraviolet range. It shows solar material at around 600,000 Kelvin. In this wavelength it is easy to see the Sun's 25-day rotation as well as how solar activity has increased over three years as the Sun's solar cycle has ramped up towards the peak of activity in its 11-year cycle.

You'll also notice that during the course of the video, the Sun subtly increases and decreases in apparent size. This is because the distance between the SDO spacecraft and the Sun varies over time. The image is, however, remarkably consistent and stable despite the fact that SDO orbits the Earth at 6,876 miles per hour and the Earth orbits the sun at 67,062 miles per hour.

Read more:

Webmaster Notes: More ISWI related videos on our site (click here)
look in Publications

SECOND -- some reminders of upcoming dead lines

(a) International School for Young Astronomers: ISYA 2013. 26 August - 13 September 2013, in Indonesia. Dead line for applications is approaching. See ISWI Newsletter Vol.5, Num.40.

(b) The International CAWSES-II Symposium (November 18-22, 2013, Nagoya, Japan) Abstract dead line is 30 June 2013. See ISWI Newsletter Vol.5, Num.21.

(c) Sunanda and Santimay Basu Early Career Award; dead line = 15 May 2013. See ISWI Newsletter Vol.5, Num.47.

If you wish to remind newsletter subscribers of a dead line, please let me know. I will send it out.

George Maeda
Editor of ISWI Newsletter

If you want to read the original newsletter, click here.