4 replies to this topic

[bladerunner6]

I had a hard time finding the answer and I would love to post the info at CruiseCritic in regards to our upcoming Solar Eclipse cruise.

Thanks.

[Tapio]

I just googled it and found these two:

https://astronomy.st...the-suns-corona

https://www.research..._fig4_301648266

 

With this question I remember a thread here (?) where someone had imaged protuberance in white light.

Do someone remember this ?

[Alan D. Whitman]

I cannot give you a specific number, but I will say that looking at the solar corona is not dazzling to the unaided eye while looking at the Full Moon is. Using a telescope on the Full Moon without a lunar filter is very uncomfortable; using a telescope on even the brightest part of the corona, the inner corona, is not at all uncomfortable. It is true that your pupils are normally wider at night than they would be during totality.

 

Before the 2009 totality I looked away from the dwindling solar crescent for the last three minutes before totality until I was told that it was total so that my eyes would not be dazzled at all by the Diamond Ring so that I could attempt to see earthshine on the Moon during totality as one sees on photographs of totality that combine exposures of many different lengths. I was successful in seeing the darkest portions of lunar maria as contrast features on the precisely New Moon using my Canon 10x30 Image-Stabilized binoculars, matching what I would later see in Miloslav Druckmuller's images of the 2009 totality. This was a sunspot minimum corona and I felt that it was the faintest solar corona that I had seen which would have aided my attempt. (Once you have seen many totalities, you start trying for arcane things like earthshine on the Moon during totality.)

 

Even if you do find a total magnitude range for the solar corona (it varies considerably from one eclipse to another), the area of the corona is many times the area of the Moon so surface brightness of the corona will be less accordingly.

 

Alan Whitman

10 total solar eclipses

Edited by Alan D. Whitman, 28 February 2023 - 01:16 PM.

[ch-viladrich]

Hello,

See discussion here :

https://www.cloudyni...-solar-eclipse/

 

Here are some references :

- the exposure time for the inner corona next to the solar limb is about the same as for full Moon,

- at one solar radius from the solar limb, the corona is 1000x weaker than at the solar limb,

- the exposure time for the corona at five solar radii from solar limb is about the same as the earthshine.

 

Christian

[bladerunner6]

Thanks all the information.

Edited by bladerunner6, 01 March 2023 - 12:31 PM.