Solar and Aurora Activity Chat

[Katrine Basso]

The Sun Today : Updated June 21, 2019 04:40 am

Sunspot number: 0

Solar flare index: 68

 

 

[SteveB]

33 days blank, 106 for 2019 62%

Solar flux 68

[Weather-history]

33 days seems a long period for this solar minimum so far. Is that the longest spotless period so far for this minimum? 

[SteveB]

34 days blank, 107 for 2019 62%

Solar flux 67

[SteveB]

14 hours ago, Weather-history said:

33 days seems a long period for this solar minimum so far. Is that the longest spotless period so far for this minimum? 

I think it is. The silos site has a 32 day period between July and August in 2009 as the the longest stretch for cycle24.

[Katrine Basso]

http://www.spaceweather.com/

 

Quote

THE SUN IS SO BLANK, IT LOOKS LIKE A BILLIARD BALL: The sun is blank--really blank. No sunspots have appeared for the past 33+ days, giving the sun the appearance of a giant orange billiard ball. This is a sign that Solar Minimum is under-way. Earlier this year, a panel of experts from NOAA and NASA predicted that the solar cycle would reach its nadir sometime between July 2019 and Sept 2020. The current stretch of spotless suns is consistent with their forecast.

Below: The sun on June 21, 2019. Credit: NASA's Solar Dynamics Observatory

[SteveB]

35 days blank, 108 for 2019 62%

Solar flux 66

[John Badrick]

Solar Flux 66 That is LOW!! 

[summer blizzard]

Do we have a list of the longest daily stretches?

[Katrine Basso]

Thermosphere Climate Index

Yesterday: 3.56x1010 W Cold

Max: 49.4x1010 W Hot (10/1957)
Min: 2.05x1010 W Cold (02/2009)

Updated: 22 June 2019

[Katrine Basso]

http://sidc.be/silso/spotless

[JeffC]

12 hours ago, John Badrick said:

Solar Flux 66 That is LOW!! 

Aye, with a bit of luck it'll stay that low for a wee while...or drop below previous low 

[SteveB]

36 days blank. 109 for 2019 62%

Solar flux 67

[summer blizzard]

Cycle 24 sunspots.

[summer blizzard]

Tracking ahead of last year to the end of June. 

Would be interesting to know what 2008 had to end June. Another couple lf deep periods could see us gunning it.

[Katrine Basso]

Daily Sun: 29 June 2019

A small and unnumbered sunspot is struggling to emerge at the circled location. Credit: SDO/HMI

Sunspot number: 0 Updated 29 June 2019

Spotless Days
Current Stretch: 1 day
2019 total: 110 days (61%

Thermosphere Climate Index
today: 3.48x1010 W Cold

The Radio Sun
10.7 cm flux: 68 sfu

[SteveB]

2 days blank, 111 for 2019 61%

Solar flux 68

[Katrine Basso]

Data from http://www.solarham.net/

Sunspot number: 0

Solar flux: 67

[SteveB]

3 days blank, 112 for 2019, 62%

Solar flux 67

[SteveB]

4 days blank, 113 for 2019 62%

Solar flux 68

[Katrine Basso]

Thermosphere Climate Index
today: 3.37x1010 W Cold

[Gray-Wolf]

Appears we had a brief appearance of a cycle 25 sunspot on July 1st?

http://www.spaceweather.com/

and even though its brevity did not alter the 'blank' reporting of that day it was still a formed sunspot.

As the report reminds us the transition to cycle 25 is now underway!

[JeffC]

8 hours ago, Gray-Wolf said:

Appears we had a brief appearance of a cycle 25 sunspot on July 1st?

http://www.spaceweather.com/

and even though its brevity did not alter the 'blank' reporting of that day it was still a formed sunspot.

As the report reminds us the transition to cycle 25 is now underway!

Remains to be seen how fast that transition into SC 25 will be

[Gray-Wolf]

14 minutes ago, JeffC said:

Remains to be seen how fast that transition into SC 25 will be

Indeed!

But like the day after winter Solstice, you know that things are now heading up towards the next solstice?

[JeffC]

5 hours ago, Gray-Wolf said:

Indeed!

But like the day after winter Solstice, you know that things are now heading up towards the next solstice?

Agreed but the next solstice is more easily predicted. We are still very much in the early stages of understanding the drivers of solar cycles in my opinion, and whilst there may be signs of SC 25 polarity change being underway, it doesn't predict the level of activity that will characterize the next SC.

It's not very unusual to have reverse polarity sunspots even well into a given SC, so this could be random or it could be an early harbinger of SC 25.

I'm not poo-pooing either way, but given the current activity I think there's a wee while yet before we can say for sure that we're into SC 25 territory proper, but I guess every day is a day nearer...

It will be interesting indeed to see what happens if SC 25 continues the decline in activity exhibited by SC 24.

Edited July 3, 2019 by JeffC