Viewing archive of Saturday, 30 December 2017

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2017 Dec 30 1230 UTC

SIDC Forecast

Valid from 1230 UTC, 30 Dec 2017 until 01 Jan 2018
Solar flares

Quiet conditions (<50% probability of C-class flares)

Geomagnetism

Active conditions expected (A>=20 or K=4)

Solar protons

Quiet

10cm fluxAp
30 Dec 2017072007
31 Dec 2017073011
01 Jan 2018074010

Bulletin

Solar activity was low, no C-class flares in past 24 h. The new compact region that appeared on the northeast limb has not been active. C-class flares are possible but unlikely.

Proton flux levels are at background values and are expected to remain so. No Earth-directed CMEs were observed.

Solar wind speed is at 390 km/s with interplanetary magnetic field magnitude of 4 nT. Geomagnetic conditions have been quiet. There is a small positive coronal hole located at 30 degrees northern latitude which may affect the Earth within 48h, active conditions can be expected then (with isolated minor storm periods possible).

Today's estimated international sunspot number (ISN): 000, based on 06 stations.

Solar indices for 29 Dec 2017

Wolf number Catania///
10cm solar flux072
AK Chambon La Forêt010
AK Wingst005
Estimated Ap004
Estimated international sunspot number000 - Based on 18 stations

Noticeable events summary

DayBeginMaxEndLocStrengthOP10cmCatania/NOAARadio burst types
None

Provided by the Solar Influences Data analysis Center© - SIDC - Processed by SpaceWeatherLive

All times in UTC

<< 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!

Donate SpaceWeatherLive Pro
Support SpaceWeatherLive with our merchandise
Check out our merchandise

Latest alerts

Get instant alerts!

Space weather facts

Last X-flare2025/03/28X1.1
Last M-flare2025/04/01M5.6
Last geomagnetic storm2025/03/27Kp5 (G1)
Spotless days
Last spotless day2022/06/08
Monthly mean Sunspot Number
February 2025154.6 +17.6
Last 30 days128.5 -22.7

This day in history*

Solar flares
12001M7.89
22017M6.34
32001M5.75
42025M5.6
52024M3.9
DstG
11960-327G4
22001-228G2
31976-218G4
41973-211G4
51989-93G2
*since 1994

Social networks