Solar and Aurora Activity Chat

[JeffC]

Observed Flux Density 71.8

Adjusted Flux Density 71.7 = low

[SteveB]

8 days blank,  198 for 2020, 71%

Solar flux 72

Thermosphere : 4.59

[JeffC]

Observed Flux Density 71.9

Adjusted Flux Density 72.0 = low

[Midlands Ice Age]

1 hour ago, SteveB said:

8 days blank,  198 for 2020, 71%

Solar flux 72

Thermosphere : 4.59

Only 2 more and it will be officially described as one of the deepest minima since..... (not that it changes much!).

How many more days before it challenges the 1911 -14 cycle? Looks like we are past the 1875 low cycle now.

I make it that about 60 are required to challenge the total number of sunspots achieved in the 1911 cycle.

Copying in SB's post of last month for reference   ---------------.    

Yes, 1913 is the winning year at 311 and indeed it is the only other cycle in the last 170 years to produce 3 years above 200. It also had a sluggish start with 150 sunspots in 1914 in year 4 of its minima. It's worth saying that timing is a factor in making that cycle look deeper, our years 1 and 2 (2018 and 2019) were deeper so at 200 sunspots this year we'll only end up ~80 behind. 

Technically the previous two solar cycles also had 4 years at 100+ but i tend to exclude them as year 1 in both cycles barely made it so in the satellite age they'd have been discounted. 

The other odd strong cycle was the 1875-1879 minima which was notable for having 5 years at 100+. It also either has missing data for 1877 or had a strange double minima.

------------ 

Anyone got access to the actual figures recorded?

MIA

Edited October 4, 2020 by Midlands Ice Age

[JeffC]

Observed Flux Density 69.8

Adjusted Flux Density 69.8 = very low

 

[SteveB]

9 days blank, 199 for 2020, 71%

Solar flux 71

Thermosphere: 4.60

[JeffC]

Observed Flux Density 72.3

Adjusted Flux Density 72.2= low

[SteveB]

Another 200+ spotless year!

10 days blank, 200 for 2020, 71%

Solar flux 71

Thermosphere: 4.54

[summer blizzard]

Strictly speaking the official number is usually 5-15 lower. 

[JeffC]

Observed Flux Density 71.7

Adjusted Flux Density 71.6 = low

[SteveB]

11 days blank, 201 for 2020, 72%

Solar flux 72

Thermosphere: 4.59

[JeffC]

Observed Flux Density 70.8

Adjusted Flux Density 70.8 = low

[Polar Maritime]

https://m.youtube.com/watch?v=ajBKFu0gzGE

[JeffC]

Observed Flux Density 71.2

Adjusted Flux Density 71.1 = low

[SteveB]

12 days blank, 202 for 2020, 72%

Solar flux 71

Thermosphere: 4.63

[JeffC]

Observed Flux Density 71.7

Adjusted Flux Density 71.5= low

[summer blizzard]

Two sunspots attempting to form in the southern hemisphere.

[SteveB]

13 days blank,  203 for 2020, 72%

Solar flux 72

Thermosphere: 4.55

[JeffC]

Observed Flux Density 73.1

Adjusted Flux Density 72.9 = low

[Don]

11 hours ago, summer blizzard said:

Two sunspots attempting to form in the southern hemisphere.

They can do one! 

[summer blizzard]

Unfortunately both spots have been declared albeit they are small and weak. 

[Don]

7 hours ago, summer blizzard said:

Unfortunately both spots have been declared albeit they are small and weak. 

Damn the little buggars!

[Cheshire Freeze]

This cycle seems very slow to get going. 

Think we can assume another very quiet cycle?

[Don]

2 hours ago, CreweCold said:

This cycle seems very slow to get going. 

Think we can assume another very quiet cycle?

Well, let’s hope so  CC.  Would give us another shot at a cold winter for 2021/22!

[JeffC]

Observed Flux Density 73.2

Adjusted Flux Density 73.0 = low