Category Archives: SDO

Eclipse Season is Here

I remember my big (satellite) dish, a couple times a year the sun would line up perfectly with the dish and everything would be lost. The signals were still there of course but the sun overpowered them, the loss of signal was about a half hour I think (it’s a guess at this point, I have not looked it up).

You could hardly miss the Supermoon of the last couple of nights. I could read a newspaper by moon light. My pictures however, well a great white spot, lol.

NASA: The SDO spacecraft is in another eclipse season as of Feb. 6, 2019. This begins a several week period when the Earth briefly blocks SDO’s view of the Sun each day. In fact, because SDO orbits above the Mountain Time zone, the Earth passes between SDO and the Sun at about 7:20 UT (12:20 am MT) each orbit. Eclipses are due to SDO’s circular geosynchronous orbit some 22,000 miles above Earth. At the speed we are showing the frames, the eclipse is only a flicker. The still image shows that the edge of Earth, here about halfway across the Sun, looks quite rough due to the absorption of the 304 Å EUV light by our atmosphere.

Credit: NASA/GSFC/Solar Dynamics Observatory

Magnetic Field Lines

I would like to see more of this. Actually I’d also like to see this done from a more distant perspective. Good work though.

The dark areas by the way are a source of solar winds which are probably not not cause earthquakes here on Earth; we start hearing that because the “other” cause (which also cannot be correlated) are sunspots and solar flares. I guess when you don’t get one you can fall back on the other.

One other thing we can see is the absence of high latitude sunspots which would be the hallmark of a new solar cycle. So are we in a “Grand Solar Minimum? Maybe, come back in ten years or so and if we are still stuck at solar minimum levels we could possibly say yes. It’s WAY too early to make such claims at this point. So when you hear that on the internet be sure to take it with a box of salt.

NASA’s caption: NASA’s Solar Dynamics Observatory (SDO) scientists used their computer models to generate a view of the Sun’s magnetic field on August 10, 2018. The bright active region right at the central area of the Sun clearly shows a concentration of field lines, as well as the small active region at the Sun’s right edge, but to a lesser extent. Magnetism drives the dynamic activity near the Sun’s surface.

SDO is managed by NASA’s Goddard Space Flight Center, Greenbelt, Maryland, for NASA’s Science Mission Directorate, Washington. Its Atmosphere Imaging Assembly was built by the Lockheed Martin Solar Astrophysics Laboratory (LMSAL), Palo Alto, California.

Image Credit: NASA/GSFC/Solar Dynamics Observatory

The Sun

Here is a look at the Sun taken yesterday by the Solar Dynamics Observatory (SDO). Not much going on as you can see.

The bright area are associated with small sunspots, we just can’t see the spots yet. Notice the spots are near the equator, will we get to see the spots as they rotate into a more advantageous viewing position? Maybe or maybe not. We are nearing the bottom of the solar cycle and sometimes spots can last for a while and sometimes they can emerge and disappear quite rapidly.

At this stage of solar cycles we would expect to see sunspots emerge closer to the equator and in this image we see nothing towards the poles. Keep an eye on the sun and eventually we will see new spots forming at high latitudes both north and south. For now the spots are indeed coming into being at low lattitudes. Sun is said to be not very active.

Does a quiet or non-active sun mean there should be no auroras? Not at all, but displays may not be very regular except at the polar regions and we are not considering coronal holes and solar winds which do add to the fun.

What about radio propagation? Not good. Ham radio operators looking for DX are longing for more activity – I know!

Where are we in the cycle? Below is the progression of the cycle through March.

Images: SDO / NASA / SWPC

The Big Question

It looks like question mark on the Sun; almost if asking will SpaceX launch Zuma in the next few days.

Update: It appears that the launch will be on Sunday 07 January between 20:00 and 22:00 EST / Monday 08 January between 00:00 and 02:00 UTC.

A launch in the next few days is the rumor. Reports have it that Space X did some testing on the pad, the sort of routine pre-launch testing the precedes every SpaceX launch.

These sorts of launches are usually live on-line but with very short notice, so we will wait and see.

My guess is Saturday afternoon/night, but it could be tonight too.  What’s really going on with the image of the Sun? Glad you asked:

Original caption:  Oddly enough, an elongated coronal hole (the darker area near the center) seems to shape itself into a single, recognizable question mark over the period of one day (Dec. 21-22, 2017). Coronal holes are areas of open magnetic field that appear darker in extreme ultraviolet light, as is seen here. These holes are the source of streaming plasma that we call solar wind. While this exercise is akin to seeing shapes in clouds, it is fun to consider what the sun might be asking? Perhaps what the new year will bring? Guess what I am going to do next?

Credit: NASA/GSFC/Solar Dynamics Observatory

Rare Solar Filament Spotted

NASA — NASA’s Solar Dynamics Observatory came across an oddity that the spacecraft has rarely observed before: a dark filament encircling an active region (Oct. 29-31, 2017). Solar filaments are clouds of charged particles that float above the sun, tethered to it by magnetic forces. They are usually elongated and uneven strands. Only a handful of times before have we seen one shaped like a circle. The black area to the left of the brighter active region is a coronal hole, a magnetically open region of the sun. While it may have no major scientific value, it is noteworthy because of its rarity. The still was taken in a wavelength of extreme ultraviolet light.

Image Credit: NASA/GSFC/Solar Dynamics Observatory

Plasma Sheet

The Sun is pretty energetic at the end of the solar cycle. This sheet of plasma above occurred on 28 July in about the same area that sunspot AR2665 is now. That sunspot, by the way, is the same one was associated with a very powerful CME on the far side of the Sun about a week ago.

There is a short video of the plasma sheet available from NASA.

NASA – A sheet of plasma blasted out into space from just behind the edge of the sun (July 28, 2017). While some material escaped into space, a portion of it was unable to break the pull of gravity and the magnetic forces nearby and can be seen falling back to the sun. The 3.5 hours of action was captured in a wavelength of extreme ultraviolet light.

Image: NASA/GSFC/Solar Dynamics Observatory

A Large Sunspot

AND a Juno update.  First take a look at this sunspot.  The spot is named AR2665 and it is huge.  Estimates are about 120,000 km / 74,560 miles from end to end and its a configuration that is not all that stable.  If this thing were to let off a flare, it could be an M-class and would be directed straight at us likely to produce vivid auroras at the least.

The image comes from the Solar Dynamics Observatory using the onboard Helioseismic and Magnetic Imager (HMI) is one of three instruments aboard the Solar Dynamics Observatory(SDO) designed to study oscillations and the magnetic field at the solar surface. HMI observes the full solar disk at 6173 Å with a resolution of 1 arc second.


The Juno spacecraft successfully flew over the Great Red Spot of Jupiter at a distance of only 9,000 km / 5,600 miles. Images to be released on 14 July.

Image: NASA / SDO

Solar Flares Seen From SDO

We must be getting close to the bottom of the current sunspot cycle. So far in 2017 we’ve had 27 days with no sunspots and last year (2016) we had a total of 32. Hopefully this won’t be a repeat of 2009 when we had 260 spotless days – the HF ham bands were pretty quiet!

Space Weather Coming Our Way

Here comes an active region on the sun, But don’t worry, despite way you may hear on the internet, in the grand scheme of things this region is nothing to get too excited about. I’m sort of hoping this area gets busier as it rotates around to us.

Yes, I am in need, the need to see a decent aurora, it’s been too long! An no, you should not put much stock into the “doom and gloom” sites quick to predict our imminent demise. Yeah those sites might be kind of fun to listen to/read about but remember as with a lot of things these days, enjoy it all, but take everything with a grain of salt – we’ve lived with ol’ Sol for an awfully long time.

From NASA and the SDO:
Magnetic arcs of plasma that spiraled above two active regions held their shape fairly well over 18 hours (Jan. 11-12, 2017). The charged plasma is being controlled the magnetic field lines of the active regions. The field lines become clearly visible when viewed in this wavelength of extreme ultraviolet light. Often the arches bend and twist more dynamically than the relatively stable ones seen here.

Credit: Solar Dynamics Observatory, NASA.

The 2016 Time Adjustment

I wonder if when the new year rang in if the countdown included the extra second that was added to the world clocks. Probably not and while it might not seem like much,  the time change is important to our view of the world thanks to our modern technology even if we don’t realize it.

We have added 27  “leap-seconds” to the clock since the practice started in 1972. Read more about adding leap-seconds.


From (mostly) NASA:   On Dec. 31, 2016, official clocks around the world added a leap second just before midnight Coordinated Universal Time — which corresponds to 6:59:59 p.m. EST. NASA missions also had to make the switch, including the Solar Dynamics Observatory, or SDO, which watches the sun 24/7.

Clocks do this to keep in sync with Earth’s rotation, which gradually slows down over time. When the dinosaurs roamed Earth, for example, our globe took only 23 hours to make a complete rotation. In space, millisecond accuracy is crucial to understanding how satellites orbit.

“SDO moves about 1.9 miles every second,” said Dean Pesnell, the project scientist for SDO at NASA’s Goddard Space Flight Center in Greenbelt, Maryland. “So does every other object in orbit near SDO. We all have to use the same time to make sure our collision avoidance programs are accurate. So we all add a leap second to the end of 2016, delaying 2017 by one second.”

The leap second is also key to making sure that SDO is in sync with the Coordinated Universal Time, or UTC, used to label each of its images. SDO has a clock that counts the number of seconds since the beginning of the mission. To convert that count to UTC requires knowing just how many leap seconds have been added to Earth-bound clocks since the mission started. When the spacecraft wants to provide a time in UTC, it calls a software module that takes into consideration both the mission’s second count and the number of leap seconds — and then returns a time in UTC.

Credit: NASA/SDO