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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2017 Jun 18 1246 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

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

Protoni solari

Quiet

	10cm flux	Ap
18 Jun 2017	075	019
19 Jun 2017	074	019
20 Jun 2017	073	008

Bulletin

Solar activity remains to be low with only one B-class flare reported in the last 24 hours. The B2.5 flare which originated from the Catania sunspot group 33 (NOAA AR 2663) peaked at 09:21 UT on June 18. We might expect isolated B-class flares in the coming hours. No Earth directed CMEs have been observed and the solar protons remained at background level in the past 24 hours.

Starting from about midday of June 17, the solar wind speed began to increase simultaneously with the temperature, and with the density decrease indicating arrival of the fast solar wind associated with two large coronal holes (one on the north and one on the south solar hemisphere) which reached central meridian in the evening of June 14. Although it is difficult to distinguish which of the two coronal holes is associated with present increase of the solar wind speed, it seems more probably that this is the coronal hole on the north solar hemisphere. The solar wind speed is about 590 km/s and the interplanetary magnetic field magnitude is 4nT. The geomagnetic conditions are presently quiet to unsettled, we expect unsettled to active geomagnetic conditions in the coming hours.

Today's estimated international sunspot number (ISN): 031, based on 22 stations.

Solar indices for 17 Jun 2017

Wolf number Catania	///
10cm solar flux	075
AK Chambon La Forêt	025
AK Wingst	021
Estimated Ap	020
Estimated international sunspot number	033 - Based on 29 stations

Noticeable events summary

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

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