Viewing archive of Friday, 31 July 2020

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2020 Jul 31 1231 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
31 Jul 2020	073	003
01 Aug 2020	073	006
02 Aug 2020	073	010

Bulletin

The solar activity remained at very low levels over the past 24 hours. The two visible sunspot regions (Catania 37/N0AA-AR 2767 and N0AA-AR 2768, both classified as alpha/Hsx now) remained stable and did not produce any significant flares. The observed X-ray flux remained below B-class level. The solar activity is expected to remain at low levels over the next 24 hours.

No Earth-directed Coronal Mass Ejections (CMEs) were observed in the available coronagraph imagery.

The greater than 10 MeV proton flux was at background levels over the past 24 hours and is expected to remain so for the next 24 hours. The greater than 2 MeV electron flux over the past 24 hours was at background to moderate levels and is expected to remain so over the next 24 hours.

Over the past 24 hours the solar wind conditions as reported by ACE and DSCOVR remained very quiet. The total interplanetary magnetic field was very weak with values between 1 nT and 6 nT. The north-south Bz component fluctuated between -5 nT and 3 nT. The Phi angle showed several long-term intervals with positive and negative orientation.

In the past 24 hours the solar wind speed remained at nominal levels typical for undisturbed slow solar wind, with values gradually increasing from 312 km/s to 370 km/s. The solar wind conditions are expected to remain quiet over the next 24 hours.

The geomagnetic conditions remained very quiet with maximum Kp-NOAA index equal to 1 and maximum K-Dourbes index equal to 2. The geomagnetic conditions are expected to remain quiet over the next 24 hours.

The recurrent positive polarity northern coronal hole (CH 64) continues to reside on the central meridian and has now become an extension of the northern polar coronal hole. The HSS emanating from this coronal hole is expected to reach the Earth from tomorrow on, causing enhancements in the solar wind speed and possibly intervals with unsettled geomagnetic conditions. These enhancements are expected to last for a few days after their onset.

Today's estimated international sunspot number (ISN): 021, based on 32 stations.

Solar indices for 30 Jul 2020

Wolf number Catania	///
10cm solar flux	073
AK Chambon La Forêt	008
AK Wingst	004
Estimated Ap	004
Estimated international sunspot number	020 - Based on 38 stations

Noticeable events summary

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

All times in UTC

<< Go to daily overview page