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Tägliches Bulletin zur solaren und geomagnetischen Aktivität des SIDC

Ausgestellt: 2017 Jun 18 1246 UTC

Vorhersage des SIDC

Sonneneruptionen

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

Geomagnetismus

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

Sonnenprotonen

Quiet

	10cm Fluss	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.

Die heute international geschätzte Sonnenfleckenanzahl (ISN): 031, basierend auf 22 Stationen.

Solarindizes für den 17 Jun 2017

Wolf-Zahl Catania	///
10cm Solarflux	075
AK Chambon La Forêt	025
AK Wingst	021
Geschätzer Ap-Wert	020
Geschätzte internationale Sonnenfleckenzahl	033 - Basierend auf 29 Stationen

Zusammenfassung auffälliger Ereignisse

Zur Verfügung gestellt vom Solar Influences Data Analysis Center© - SIDC - Verarbeitet von SpaceWeatherLive

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