Viewing archive of Thursday, 16 December 1999

Sunspot numberNew regionsBackground fluxMaximum fluxC
146 -23 3C1.0C3.584

Solar flares

RegionStartMaximumEnd
8798C2.5 03:0903:1403:18
8798C2.4 07:2007:2407:29
8794C2.2 08:3108:3608:45
-C3.5 20:1020:1520:19

<< Go to daily overview page

Latest news

Support SpaceWeatherLive.com!

A lot of people come to SpaceWeatherLive to follow the Sun's activity or if there is aurora to be seen, but with more traffic comes higher server costs. Consider a donation if you enjoy SpaceWeatherLive so we can keep the website online!

92%

Latest alerts

Get instant alerts!

Space weather facts

Last X-flare:2017/09/10X8.2
Last M-flare:2017/10/20M1.0
Last geomagnetic storm:2019/06/08Kp5 (G1)
Number of spotless days in 2019:105
Current stretch spotless days:33

This day in history*

Solar flares
11999M2.9
22015M1.0
32000C6.2
42001C5.7
51999C5.5
ApG
1199520G1
2199814G1
3199414
4201311
5200311
*since 1994

Social networks