Viewing archive of Sunday, 28 July 2019

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2019 Jul 28 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
28 Jul 2019	068	007
29 Jul 2019	068	007
30 Jul 2019	068	007

Bulletin

The solar activity has been quiet over the past 24 hours. The sun is currently spotless and the X-ray flux remained below B-level. Solar activity is expected to remain at low levels for the next 24 hours.

No Earth directed coronal mass ejections (CME) were observed over the last 24 hours in the available coronagraph imagery. The greater than 10 MeV proton flux remained at background levels over the past 24 hours and is expected to remain at low levels.

The solar wind parameters were mostly at nominal levels indicative of slow solar wind regime (300-350 km/s). The total interplanetary magnetic field remained below 6 nT, except for a very short period when it peaked at 8 nT. The Bz component varied between -5 nT and +4 nT. A recurrent equatorial coronal hole with negative polarity has just reached the central meridian. The coronal hole surface area has increased compared to the previous rotation suggesting that the high-speed stream effect is expected to be stronger than the previous rotation. The effect on the solar wind environment near Earth is expected to get enhanced on the 31st of July.

Quiet geomagnetic conditions were observed over the past 24 hours, and is expected to remain so until the arrival of the high-speed stream on the 31st of July when more active conditions are expected.

Today's estimated international sunspot number (ISN): 000, based on 07 stations.

Solar indices for 27 Jul 2019

Wolf number Catania	///
10cm solar flux	067
AK Chambon La Forêt	012
AK Wingst	006
Estimated Ap	006
Estimated international sunspot number	000 - Based on 21 stations

Noticeable events summary

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

All times in UTC

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