Viewing archive of Tuesday, 27 June 2017

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2017 Jun 27 1230 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

	10cm flux	Ap
27 Jun 2017	074	009
28 Jun 2017	075	006
29 Jun 2017	075	010

Bulletin

Solar activity was at very low levels during the period. NOAA 2664 gained some sunspot area in its northwestern portion, but remained quiet. An active region is rotating over the east limb, but is currently still spotless. No earth-directed coronal mass ejections (CMEs) were observed in available coronagraphic imagery. The greater than 10MeV proton flux was at nominal levels.

Quiet flaring conditions are expected, with a small chance on a C-class flare.

Earth is under the waning influence of a coronal hole wind stream. Solar wind speed peaked around 13:00UT with a brief spike of about 610 km/s (DSCOVR). The overall wind speed gradually declined from its initial 570 km/s to around 470 km/s at the end of the period. Bz fluctuated between -3 and +3 nT. The interplanetary magnetic field was mostly directed away from the Sun. A small positive equatorial coronal hole (CH) was at the central meridian on 25 June.

The geomagnetic field was at quiet to unsettled levels, and is expected to remain so. The particle stream from the small CH may briefly enhance geomagnetic conditions on 29 or 30 June, with a small chance on an active episode.

Today's estimated international sunspot number (ISN): 019, based on 16 stations.

Solar indices for 26 Jun 2017

Wolf number Catania	042
10cm solar flux	074
AK Chambon La Forêt	013
AK Wingst	010
Estimated Ap	010
Estimated international sunspot number	024 - Based on 34 stations

Noticeable events summary

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

All times in UTC

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