Viewing archive of Saturday, 26 May 2018

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2018 May 26 1247 UTC

SIDC Forecast

Valid from 1230 UTC, 26 May 2018 until 28 May 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
26 May 2018076003
27 May 2018077005
28 May 2018076011

Bulletin

Solar activity was at low levels. The largest flare B3.7 originated at NOAA AR 2711 (McIntosh: Cso; Mag.Type: Beta) peaked yesterday (25-May-2018) at 20:09 UT. NOAA AR 2710 decayed to Halpha plage. No earth- directed coronal mass ejections (CMEs) were observed in available coronagraphic imagery. The greater than 10 MeV proton flux was at nominal levels. Solar activity is expected to be at low levels with some probability for C class flares. Solar wind parameters returned to the background level. The solar wind speed gradually decreased from 375 km/s till about 320 km/s. The total magnetic field was below 5 nT. The Bz component fluctuated around 0nT between -1 nT and +3 nT. Geomagnetic conditions ranged between Kp index 0-1 (NOAA) and local K index 1-3 (Dourbes) over the past 24 hours. Geomagnetic conditions are expected to be quiet today and tomorrow. Later, from 28-May-2017 most likely unsettled geomagnetic conditions can be expected due to the weak influence from a positive polarity low lattitude extension of the northern coronal hole.

Today's estimated international sunspot number (ISN): 028, based on 18 stations.

Solar indices for 25 May 2018

Wolf number Catania035
10cm solar flux076
AK Chambon La Forêt///
AK Wingst004
Estimated Ap003
Estimated international sunspot number033 - Based on 26 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-flare2025/04/01M2.4
Last geomagnetic storm2025/03/27Kp5 (G1)
Spotless days
Last spotless day2022/06/08
Monthly mean Sunspot Number
February 2025154.6 +17.6
Last 30 days128.1 -22.5

This day in history*

Solar flares
12001X28.5
22001X2.01
32001X1.59
42014M9.35
52017M8.22
DstG
11960-272G3
21973-173G3
32001-101G1
41976-101G1
51994-96G3
*since 1994

Social networks