Viewing archive of Tuesday, 21 December 1999

Sunspot numberNew regionsBackground fluxCM
129 -200C1.171

Solar flares

RegionStartMaximumEnd
8806C3.2 01:0301:0901:18
8807C1.3 02:3602:5503:00
-C1.4 03:0203:1403:31
8806C1.5 08:2208:3008:37
8798C2.0 10:3110:3510:38
8806M1.1 17:1217:1917:22
-C2.6 21:4121:4621:49
8803C3.4 23:3023:3823:46

<< 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!

60%

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:2019/03/17Kp5 (G1)
Number of spotless days in 2019:53
Last spotless day:2019/03/17

This day in history*

Solar flares
12001M1.8
22013M1.6
32000M1.0
42001C9.8
52000C8.8
ApG
1199638G2
2199835G2
3200330G1
4199428G1
5201724G1
*since 1994

Social networks