Viewing archive of Tuesday, 27 October 2020

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2020 Oct 27 1231 UTC

SIDC Forecast

Solar flares

C-class flares expected, (probability >=50%)

Geomagnetism

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

Solar protons

Quiet

	10cm flux	Ap
27 Oct 2020	075	017
28 Oct 2020	076	022
29 Oct 2020	077	017

Bulletin

The new region that emerged south of disk center has been numbered as NOAA AR 2778, it has beta magnetic field configuration. It produced four C-class flares today, the largest was a C4.3 peaking at 06:16 UT. More C-class and possible M-class flares can be expected.

A filament erupted close to central meridian (around N30 in latitude) at 22:00 UT on 26 October. There could be a CME with an Earth directed component, but there is a gap in coronagraph data that hinders its identification. More info will be given when/if the data becomes available.

The greater than 10 MeV proton flux was at background levels over the past 24 hours. It is expected to stay at background levels for the next 24 hours. The greater than 2 MeV electrons are above the 10^3 pfu threshold, as the Earth is still under the influence of a High Speed Stream (HSS) from a coronal hole (CH). The electrons are expected to stay at elevated levels in the next 24 h.

The speed of the solar wind varied between 580 and 510 km/s. The Earth is still inside the HSS from a positive polarity coronal hole. Bz was never below -5 nT and B reached 5 nT. Elevated solar wind speeds are expected for the next 24 hours.

The geomagnetic conditions were up to active levels at planetary index (Kp = 4) and unsettled locally (KDourbes = 3). More active conditions can be expected in the next 48 hours, as the Earth is still under the influence of the HSS.

Today's estimated international sunspot number (ISN): 042, based on 10 stations.

Solar indices for 26 Oct 2020

Wolf number Catania	019
10cm solar flux	075
AK Chambon La Forêt	019
AK Wingst	019
Estimated Ap	019
Estimated international sunspot number	018 - Based on 27 stations

Noticeable events summary

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

All times in UTC

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