Viewing archive of Wednesday, 10 April 2019

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2019 Apr 10 1231 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

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

Solar protons

Quiet

	10cm flux	Ap
10 Apr 2019	079	019
11 Apr 2019	079	011
12 Apr 2019	078	011

Bulletin

Over the past 24 hours solar activity has been low. The largest flare was a B2.0 class flare. Active Region (AR) 2738 (Mcintosh class:Cho; Mag. type:Beta) has been most active, the region has shown some evidence of flux emergence and cancellation in HMI magnetogram observations, this may increase flaring activity. Former AR 2737 has moved over the west solar limb. No significant filament channels have been seen on the solar disk. No Earth directed Coronal Mass Ejections (CMEs) have been detected. There are no significant low latitude coronal holes on the solar disk. The greater than 10MeV proton flux remained at background levels over the past 24 hours. Solar activity is expected to remain low over the next 24 hours with a reasonable chance of a C-class flare from AR 2738.

The solar wind speed has fluctuated between 400 and 480 km/s over the past 24 hours, with a jump in speed experienced late on 09-Apr-2019. The total magnetic field strength has fluctuated between 4 and 8 nT. The Bz component has fluctuated around 0 nT, ranging between -8 and +7 nT. Geomagnetic conditions ranged between Kp index 2-4 (NOAA) and local K index 1-3 (Dourbes) over the past 24 hours. The Kp 4 was produced this morning due to a Bz of -8 nT and solar wind speeds reaching 480 km/s. Geomagnetic conditions are expected to be quiet with periods of unsettled-to-active conditions created by sporadic fluctuations in Bz and the solar wind speed.

Today's estimated international sunspot number (ISN): 014, based on 24 stations.

Solar indices for 09 Apr 2019

Wolf number Catania	///
10cm solar flux	079
AK Chambon La Forêt	019
AK Wingst	010
Estimated Ap	010
Estimated international sunspot number	013 - Based on 26 stations

Noticeable events summary

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

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