Aurora Borealis: 11–12 November 2025

The Sun remains active even though it has probably passed Solar Max—and auroras once again visited low latitudes, including northern Arizona. The geomagnetic storm forecast indicated auroras were likely into the middle latitudes with a chance of appearing at low latitudes. I was ready to view the aurora but the weather was uncooperative. Clouds increased during the day and by sunset a layer of high clouds covered the region. But an hour or two later I was able to see stars overhead (but not low on the horizon) so I decided it might be worth the effort.

It was worth the effort.

As we did for the October 2024 event, we watched and photographed the aurora from Ashurst Lake near Flagstaff, Arizona. I was again hoping to capture reflections of the aurora on the still waters of the lake and was successful. I even managed to capture an image with a heron standing in the shallow water and silhouetted by the bright aurora to the north.

At first the aurora was faint and clouds in the north blocked the view. Gradually, the clouds moved out of the way. And, then, between about 2135 and 2155 MST (0435 to 0455 UTC 12 November 2025) there was a strong substorm that lit up the sky. It was bright enough to illuminate the landscape and even cast faint shadows.

The aurora was seen as far south as latitude 13°N in El Salvador!

Here are a few still images and a time-lapse video. Images were shot with a Nikon D850, Tamron 12mm fisheye lens, ISO 3200, ƒ/4, 15 seconds.

The beginning of the substorm at 2140 MST (0440 UTC). Numerous pillars are visible across the northern sky (12mm fisheye lens).
The beginning of the substorm at 2140 MST (0440 UTC). Numerous pillars are visible across the northern sky (12mm fisheye lens).
A few minutes later (2148 MST; 0448 UTC) a SAR (Stable Aurora Red) arc appears above the pillars.
A few minutes later (2148 MST; 0448 UTC) a SAR (Stable Aurora Red) arc appears above the pillars.
A heron wades in the shallow water of Ashurst Lake and is silhouetted by the bright aurora in the north.
A heron wades in the shallow water of Ashurst Lake and is silhouetted by the bright aurora in the north.

Time-lapse video from 1948–2226 MST (0248–0526 UTC). Very little activity is present at first but then the substorm erupts with numerous pillars developiing along with a SAR (Stable Aurora Red) arc the propogates upgward. And all of this is reflected in the lake.

And there may be yet more big events during this solar cycle!


Here is some additional information about this aurora and current solar cycle.

From Forbes.com:

Some of the strongest and most widespread displays of auroras since Oct. 10, 2024, occurred overnight on Tuesday, Nov. 11, into Wednesday, Nov. 12, according to NOAA, caused by one of the most powerful G4-rated geomagnetic storms of the current solar cycle.

The potent geomagnetic storm occurred after two particularly fast-moving coronal mass ejections — clouds of charged particles from the sun — erupted from the sun on Sunday, Nov. 9, and Monday, Nov. 10, in the wake of an X1.7 and X1.2-class solar flares. It left space weather scientists on high alert this week.

The last three major events from the current solar cycle are shown in this table from Wikipedia:

30 April – 12 May 2024 May 2024 solar storms X1.2(X1.3)-class flares[95] and X4.5-class flare.[96] The flares with a magnitude of 6–7 occurred between 30 April and 4 May 2024. On 5 May the strength of the solar storm reached 5 points, which is considered strong according to the K-index. The rapidly growing sunspot AR3663 became the most active spot of the solar cycle 25. On 5 May alone, it emitted two X-class (strongest) flares and six M-class (medium) flares. Each of these flares resulted in a short-term but profound disconnection of the Earth’s radio signal, resulting in signal loss at frequencies below 30 megahertz (MHz).[97]

An extreme (G5) geomagnetic storm alert was issued by the National Oceanic and Atmospheric Administration (NOAA) – the first in almost 20 years.[98][99] The final storms reaching the highest level of NOAA’s G-scale before solar cycle 25 occurred in 2005 in May,[100][101][102] August,[103] and September, respectively.

With a NOAA rating of G5, an estimated peak Dst of −412 nT, and aurorae seen at far lower latitudes than usual in both hemispheres, this geomagnetic storm was the most powerful to affect Earth since November 2003. A later study estimates a Dst peak of −518 nT, meaning the strongest storm since 1989 and the second strongest since 1921.[71]

Oct 2024 October 2024 solar storm Triggered by an X1.8 solar flare that produced a relatively fast CME.[104][105] The storm reached a peak Dst of −341 nT.[106] Auroras seen as far south as Cuba.[107]
Nov 2025 November 2025 solar storm Auroras seen as far south as Central Mexico.[108]

 

Milky Way with the Tamron Lens

Earlier this year I rented a Tamron SP 35mm ƒ/1.4 Di USD lens to use for shooting the Perseids meteor shower. Yes, I know, the Moon was an issue in 2025 but I wanted to test this lens. The reason I was interested in a 35mm ƒ/1.4 can be seen in this article at Clarkvision.com in which he describes the best combinations of aperture vs. focal length to maximize the number of meteors per exposure. And the choice of this particular lens was informed by this review article.

Milky Way with the Tamron 35mm f/1.4 lens. The star Vega is visible at the center bottom and the North America Nebula is located in the upper right.
Milky Way with the Tamron 35mm f/1.4 lens. The star Vega is visible at the center bottom and the North America Nebula is located in the upper right.

While I did not capture many meteors (the Moon, remember?) I was impressed with the optical quality of this lens. In fact, I ended up purchasing the rental lens since I had already done my testing with that particular sample.

I have used this lens on a couple occasions to photograph Comet C/2025 A6 (Lemmon) in which I used tracking to get a 2-minute exposure of the comet followed by untracked to get a similar exposure of the foreground. The results were further proof that this was a very good lens with sharp stars all the way into the corners.

Earlier this month I put it to another test when I did exposures of the Milky Way and aligned the camera so that the Milky Way passed diagonally across the lens and into the corners. I then stacked ten 2-minute images using Siril.

These images were shot with the aperture wide open at ƒ/1.4, ISO 200, and 120 seconds.

Interestingly, the result was too many stars! Indeed, the wide-open ƒ/1.4 aperture captured so much light that there were too many stars so I used some star reduction techniques available in Siril. The reduction technique resulted in a very pleasing final image presented here.

This will be a useful addition to my collection of astrophotography lenses for capturing wide views (54.3° x 37.7° field) of the night sky.

Edit: 11/20/2025 Fixed typo.

Comet C/2025 A6 (Lemmon)–November 2025

There haven’t been too many opportunities to photograph the comet in the first half of November owing to a bright Moon and cloudy skies. But I did get very dark skies on the evening of November 6 and shot a sequence spanning about 15 minutes near the end of twilight and when the comet dropped below the trees. The images were stacked and aligned using Siril and then finished in Lightroom/Photoshop.

Comet C/2025 A6 (Lemmon) on 06 November 2025 with a 180 mm lens.
Comet C/2025 A6 (Lemmon) on 06 November 2025 with a 180 mm lens.
Black-and-white negative version of Comet C/2025 A6 (Lemmon) on 06 November 2025 using a 180 mm lens.
Black-and-white negative version of Comet C/2025 A6 (Lemmon) on 06 November 2025 using a 180 mm lens.

The final image was then converted to a black-and-white negative as this format can show more of the detail in the comet’s tail. It also shows more of the satellite tracks that criss-cross the sky.

It has been fun shooting this comet and now I look forward to the next photogenic comet to grace our skies.

Nikon D850, Nikon 180 mm AI-s, f/4, ISO 200, 7×120 seconds.

Comet C/2025 A6 (Lemmon)–October 2025

Comet C/2025 A6 (Lemmon) from Sedona on 24 October 2025.

I have enjoyed several evenings (and one early morning) viewing and photographing Comet C/2025 A6 (Lemmon). My first sighting was the morning of 06 October 2025. By mid-October the comet had moved enough that it was visible in the evening sky.

From the Wikipedia entry for the comet:

C/2025 A6 (Lemmon) approached Earth at a distance of 0.60 AU (90 million km; 56 million mi) on 21 October 2025. It reached an apparent magnitude of 3.5 to 4.4 according to different estimates, indicating that it could be visible to the naked eye from sufficiently dark skies. During its closest approach the comet was visible in the sunset sky with a solar elongation of 42 degrees.

Here are some images and time-lapse videos of the comet.

Comet C/2025 A6 (Lemmon) in the pre dawn hours on 06 October 2025.
Comet C/2025 A6 (Lemmon) in the pre dawn hours on 06 October 2025.

A time-lapse video of the comet on the same morning shows how quickly the comet moves against the background of stars in a period of one hour.

Viewing the comet in the evening was much easier.

Comet C/2025 A6 (Lemmon) in the evening hours (85 mm; 18 October 2025).
Comet C/2025 A6 (Lemmon) in the evening hours (85 mm; 18 October 2025).

Time-lapse video of the motion of the comet (18 October 2025).

The following night I switched lenses to a medium telephoto (180mm) and was able to resolve a lot of detail in the tail of the comet.

Comet C/2025 A6 (Lemmon ) on 19 October 2025.
Comet C/2025 A6 (Lemmon ) on 19 October 2025.

The next evening I went to Ashurst Lake (southeast of Flagstaff) to try and capture the comet with reflections in the water. This time I shot with a wide angle lens (35mm) to get the evening sky with the lake.

Comet C/2025 A6 (Lemmon) and Ashurst Lake. The San Francisco Peaks can be seen to the right.
Comet C/2025 A6 (Lemmon) and Ashurst Lake. The San Francisco Peaks can be seen to the right.

A few nights later I was in Sedona and shot this image from the Cultural Park on the west side of town. There was a lot of green airglow present low in the sky. Also, the dome of light in the center of the image is from Las Vegas — 200 miles away.

Comet C/2025 A6 (Lemmon) from Sedona. (35 mm; 24 October 2025.
Comet C/2025 A6 (Lemmon) from Sedona. (35 mm; 24 October 2025.
Comet C/2025 A6 (Lemmon) from Mormon Lake overlook (180 mm, 20 October 2025).
Comet C/2025 A6 (Lemmon) from Mormon Lake overlook (180 mm, 20 October 2025).

It was time for the big lens — the Nikon 200–500mm lens at full telephoto. These were taken at Upper Lake Mary. The focus is just a bit soft owing to operator error but it still shows a lot of interesting detail in the tail.

Comet C.2025 A6 (Lemmon) on 30 October 2025.
Comet C.2025 A6 (Lemmon) on 30 October 2025.
A black and white negative image of the comet. This format shows a lot of detail.
A black and white negative image of the comet. This format shows a lot of detail.

The moon is nearly full right now. I’ll wait about a week until the skies are very dark again and shoot more images of the comet before it fades away.

 

 

Wildflower Season Keeps on Going

Earlier I wrote that the wildflower season was coming to an end. To my surprise, it just keeps on going. The September rains were very beneficial and the result is I get to enjoy the flowers for a fews weeks more.

Here  are some wildflower photographs from later September through mid October.

A scarlet bugler (Penstemon centranthifolius) seen on the Weatherford Trail in the San Francisco Peaks.
A scarlet bugler (Penstemon centranthifolius) seen on the Weatherford Trail in the San Francisco Peaks.
Purple and yellow wildflowers on the Weatherford Trail in the San Francisco Peaks.
Purple and yellow wildflowers on the Weatherford Trail in the San Francisco Peaks.
Lupine wildflowers on the Weatherford Trail.
Lupine wildflowers on the Weatherford Trail.
White asters on the Highland Trail south of Flagstaff.
White asters on the Highland Trail south of Flagstaff.
White asters on the Highland Trail south of Flagstaff.
White asters on the Highland Trail south of Flagstaff.
Purple asters on the Highland Trail south of Flagstaff.
Purple asters on the Highland Trail south of Flagstaff.
Lupine flowers on the Humpreys Trail at Arizona Snowbowl.
Lupine flowers on the Humpreys Trail at Arizona Snowbowl.