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DXER Ham Radio DX News

The latest dx news/current propagation and more. Visit mike's Amateur Radio Page at

Saturday, July 29, 2017

Today’s Sun, seen through a filter of...

Today’s Sun, seen through a filter of ‘visible’ light (remember: NEVER look directly at the Sun!), as viewed by the Solar Dynamics Observatory (SDO), by the Helioseismic Magnetic Imager (HMI). This image is known as a 'continuum’ image; a continuum image is formed by filtering portions of the visible light part of the spectrum. The SDO HMI is designed to study oscillations and the magnetic field at the solar surface, or photosphere.

The continuum images allow us to track the evolution of sunspots. These images are important as they allow us to better understand the dynamic nature of the solar atmosphere.

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BOOK SALE: Space Weather and Sun Science - get these from Amazon, and help us stay online!

NOTICE: When you buy this (or any item after starting with this link), you are helping us keep our and other resources “on the air” (up and running!). In other words, you are helping the entire community. So, check out this book:

Here is the link to Amazon:

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Don’t forget: You can also get the space weather and radio propagation self-study course, today. Visit for the latest sale and for more information!

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