Explanation: Awash in a sea of incandescent plasma and anchored in strong magnetic fields, sunspots are planet-sized dark islands in the solar photosphere, the bright surface of the Sun. Found in solar active regions, sunspots look dark only because they are slightly cooler though, with temperatures of about 4,000 kelvins compared to 6,000 kelvins for the surrounding solar surface. These sunspots lie in active region AR2835. The largest active region now crossing the Sun, AR2835 is captured in this sharp telescopic close-up from July 1 in a field of view that spans about 150,000 kilometers or over ten Earth diameters. With powerful magnetic fields, solar active regions are often responsible for solar flares and coronal mass ejections, storms which affect space weather near planet Earth.
The sunspot seems to be a deep wormhole.
In fact it is as flat as the bright hot grains all around.
Its strong (3000 gauss) magnetic field stops the flow that heats the grains from the Convection zone beneath.
Where did the APOD description mention the words deep and wormhole? I must have missed that. And I have always thought that when they mention an atmosphere is thick that they meant deep instead of wide. For example when geologists say the Vesuvius eruption covered Pompeii with a thick layer of ash, that they meant deep instead of wide. So if your quote said the sunspot is tens of kilometers thick, wouldn't that be deep?
orin stepanek wrote: ↑Fri Jul 02, 2021 11:06 am
Could not get the Magnetic fields video to work! Hmm!
Works for me. There is also a youtube link.
Know the quiet place within your heart and touch the rainbow of possibility; be
alive to the gentle breeze of communication, and please stop being such a jerk. — Garrison Keillor
dBerch wrote: ↑Fri Jul 02, 2021 6:11 pm
In today's APOD of sunspots, you state " Found in solar active regions, sunspots look dark only because they are slightly cooler"
I'm sorry, but it just looks like hole to me. Am I mistaken?
Yes. Everything we see here is very nearly on a common surface, with very little relief. Brightness is determined by temperature.
Chris
*****************************************
Chris L Peterson
Cloudbait Observatory https://www.cloudbait.com
dBerch wrote: ↑Fri Jul 02, 2021 6:11 pm
In today's APOD of sunspots, you state " Found in solar active regions, sunspots look dark only because they are slightly cooler"
I'm sorry, but it just looks like hole to me. Am I mistaken?
I think it is something visible in a place where the spot would not be expected. Therefore an understanding of why and how is desired. Initially I was thinking of two holes in water connected beneath the water, like a tunnel. But such a thing would be both unexplainable and impossible. How does one explain the Chunnel from London to Paris? Moving away from the sun I decided to consider an ice cube in a tub of water. How did it get there and why. Through that idea away as being unnatural.
Something cold on a hot surface? Got it.
Looking at today’s APOD, I can relate to a pothole/mud-puddle on a winter day. Cold water with a piece of ice floating about in it. Not magnetic lines but a dynamic which puts this sunspot into a form I can understand.
Three cheers for today’s APOD and the scientists that brought it to me.
dBerch wrote: ↑Fri Jul 02, 2021 6:11 pm
In today's APOD of sunspots, you state " Found in solar active regions, sunspots look dark only because they are slightly cooler"
I'm sorry, but it just looks like hole to me. Am I mistaken?
Yes. Everything we see here is very nearly on a common surface,
with very little relief. Brightness is determined by temperature.
Moderate relief :
Crater Lake (Oregon) is ~7,300 meters wide & ~350 meters (~5%) deep.
A Sunspot 130,000 kilometers wide is about 4,000 kilometers (~3%) deep.
The shallow Pacific Ocean is ~13,000 km wide and ~4 km (~0.03%) deep.
The sunspot—shallow or deep?
Geomagnetism and Aeronomy volume 54, pages 915–919 (2014)
A. A. Solov’ev & E. A. Kirichek
Abstract: Two sunspot models are compared-shallow and deep. According to the former, a sunspot, as a region occupied by a strong regular field and comparatively cold plasma, penetrates into the solar convection zone to a shallow depth of about 4 Mm. This corresponds to both local seismology data and a series of compelling theoretical arguments. The deep model supposes that the sunspot magnetic field penetrates to the bottom of the convective zone, with the monotone increasing with depth without being turbulized, where it attains a strength of higher than 150 kG. It is shown that the deep model contradicts some basic concepts of solar physics and cannot be an alternative to the shallow sunspot model.
dBerch wrote: ↑Fri Jul 02, 2021 6:11 pm
In today's APOD of sunspots, you state " Found in solar active regions, sunspots look dark only because they are slightly cooler"
I'm sorry, but it just looks like hole to me. Am I mistaken?
Yes. Everything we see here is very nearly on a common surface,
with very little relief. Brightness is determined by temperature.
Moderate relief :?: :
Crater Lake (Oregon) is ~7,300 meters wide & ~350 meters (~5%) deep.
A Sunspot 130,000 kilometers wide is about 4,000 kilometers (~3%) deep.
The shallow Pacific Ocean is ~13,000 km wide and ~4 km (~0.03%) deep.
The sunspot—shallow or deep?
Geomagnetism and Aeronomy volume 54, pages 915–919 (2014)
A. A. Solov’ev & E. A. Kirichek
Abstract: Two sunspot models are compared-shallow and deep. According to the former, a sunspot, as a region occupied by a strong regular field and comparatively cold plasma, penetrates into the solar convection zone to a shallow depth of about 4 Mm. This corresponds to both local seismology data and a series of compelling theoretical arguments. The deep model supposes that the sunspot magnetic field penetrates to the bottom of the convective zone, with the monotone increasing with depth without being turbulized, where it attains a strength of higher than 150 kG. It is shown that the deep model contradicts some basic concepts of solar physics and cannot be an alternative to the shallow sunspot model.
Moderate is probably an overstatement. Tiny is probably better.
Chris
*****************************************
Chris L Peterson
Cloudbait Observatory https://www.cloudbait.com
Yes. Everything we see here is very nearly on a common surface,
with very little relief. Brightness is determined by temperature.
Moderate relief :
Crater Lake (Oregon) is ~7,300 meters wide & ~350 meters (~5%) deep.
A Sunspot 130,000 kilometers wide is about 4,000 kilometers (~3%) deep.
The shallow Pacific Ocean is ~13,000 km wide and ~4 km (~0.03%) deep.
The sunspot—shallow or deep?
Geomagnetism and Aeronomy volume 54, pages 915–919 (2014)
A. A. Solov’ev & E. A. Kirichek
Abstract: Two sunspot models are compared-shallow and deep. According to the former, a sunspot, as a region occupied by a strong regular field and comparatively cold plasma, penetrates into the solar convection zone to a shallow depth of about 4 Mm. This corresponds to both local seismology data and a series of compelling theoretical arguments. The deep model supposes that the sunspot magnetic field penetrates to the bottom of the convective zone, with the monotone increasing with depth without being turbulized, where it attains a strength of higher than 150 kG. It is shown that the deep model contradicts some basic concepts of solar physics and cannot be an alternative to the shallow sunspot model.
Moderate is probably an overstatement. Tiny is probably better.
Define "tiny" (in either absolute or relative terms).
Valles Marineris is ~7 km (= ~0.2% of Mars's radius) deep.
A sunspot is ~4,000 km (= ~0.6% of Sol's radius) deep.
De58te wrote: ↑Fri Jul 02, 2021 10:18 am
Where did the APOD description mention the words deep and wormhole? I must have missed that. And I have always thought that when they mention an atmosphere is thick that they meant deep instead of wide. For example when geologists say the Vesuvius eruption covered Pompeii with a thick layer of ash, that they meant deep instead of wide. So if your quote said the sunspot is tens of kilometers thick, wouldn't that be deep?
Do you like to see a wormhole presentation of this sunspot? Here it is.
This 3D is as deep as wide, and is wrong.
There is in fact no external illumination leaving a hole dark here.
But there is a space for a debate, underneath the pancake of this sunspot.