Solar and Aurora Activity Chat

[SteveB]

3 days blank, 135 for 2019 65%

Solar flux 68

Thermosphere: 2.84

[SteveB]

4 days blank, 136 for 2019 65%

Solar flux 68

Thermosphere: 2.81

[SteveB]

5 days blank, 135 for 2019 66%

Solar flux 67

Thermosphere: 2.82

[Katrine Basso]

http://www.solarham.net/

Sun spot number: 0

The Radio Sun
10.7 cm flux: 67 sfu

304A: 159:0 @ EVE

A4

K2

X-Ray: A6.6

Mag (Bz): 1.0

Solar Wind: 376.2

[SteveB]

6 days blank, 138 for 2019 66%

Solar flux 67

Thermosphere 2.62

[SteveB]

7 days blank, 139 days for 2019 66%

Solar flux 66

Thermosphere: 2.67

[SteveB]

8 days blank, 140 for 2019 66%

Solar flux 66

Thermosphere: 2.61

[SteveB]

9 days blank, 141 for 2019 66%

Solar flux 67

Thermosphere: 2.61

[Katrine Basso]

The http://www.spaceweather.com/ website has not updated yet.

Data comes from the  http://www.solarham.net/website.

Sunspot number 0

Solar flare index: 67

 

[SteveB]

10 days blank, 142 for 2019 66%

Solar flux 67

Thermosphere: 2.65

[SteveB]

11 days blank, 143 for 2019 67%

Solar flux 67

Thermosphere: 2.65

[SteveB]

12 days blank, 144 for 2019 67%

Solar flux 66

Thermosphere 2.66

[Snowy L]

Solar flux is now at 65.7 pretty much as low as you can get.

[SteveB]

13 days blank, 145 for 2019 67%

Solar flux 67

Thermosphere 2.59

[Yarmy]

11 hours ago, Snowy L said:

Solar flux is now at 65.7 pretty much as low as you can get.

That's observed flux though. The adjusted flux is 67.7 which ranks about #300 in this cycle minimum. The lowest adjusted flux reading for this cycle so far is 64.3 on the 9th Nov 2017. The lowest reading during the previous minimum was 63.6 (8th Nov 2007).

[SteveB]

1 day blank, 146 for 2019 66%

Solar flux 68

Thermosphere: 2.95

[summer blizzard]

We had another spot?

[feb1991blizzard]

Do we actually know yet the actual point of solar min in this cycle?

[JeffC]

1 minute ago, feb1991blizzard said:

Do we actually know yet the actual point of solar min in this cycle?

my understanding is that we only know the absolute minimum precisely in retrospect - when extrapolated back from increased SS No's and a sort of V graph is created to show cross over point from descending No's to ascending No's. Or similar!

[feb1991blizzard]

1 minute ago, JeffC said:

my understanding is that we only know the absolute minimum precisely in retrospect - when extrapolated back from increased SS No's and a sort of V graph is created to show cross over point from descending No's to ascending No's. Or similar!

Yes i have read that, its important for building winter analogues, but there is a lag effect, if min has only just been reached then that isn't the very best signal for a blocked winter, if its significantly past the date solar min, like a year, then that is the best signal solar wise for a cold UK winter. 

[JeffC]

3 minutes ago, feb1991blizzard said:

Yes i have read that, its important for building winter analogues, but there is a lag effect, if min has only just been reached then that isn't the very best signal for a blocked winter, if its significantly past the date solar min, like a year, then that is the best signal solar wise for a cold UK winter. 

yes I think it's almost like with a SSW it's not an instant response, although I guess if the sun blew altogether we'd know about it about 8 minutes later. These changes are more subtle and take time to change the existing momentum within the system(s).

[jonboy]

29 minutes ago, summer blizzard said:

We had another spot?

yes it lasted two days with a count of 12 and 11 in days gone by it wouldn't have been seen

[JeffC]

Just now, jonboy said:

yes it lasted two days with a count of 12 and 11 in days gone by it wouldn't have been seen

do we know was it characteristic of SC 24 or SC 25 polarity wise?

 

[Yarmy]

14 minutes ago, feb1991blizzard said:

Do we actually know yet the actual point of solar min in this cycle?

You can't know it until (at least) 6 months after it's happened because it is defined as the lowest value of the 13-month smoothed monthly SSN mean. Given the dearth of spots in the past couple of months, it's unlikely that we are quite there yet.

[feb1991blizzard]

1 minute ago, JeffC said:

yes I think it's almost like with a SSW it's not an instant response, although I guess if the sun blew altogether we'd know about it about 8 minutes later. These changes are more subtle and take time to change the existing momentum within the system(s).

Yes we would soon know about it quicker than just low solar activity though as we would be cold very quickly even in summer, so wouldn't have to wait until 22nd November for a Greenland high to notice the effects like in 2010