Solar and Geomagnetic Activity update

News
:Issued: 2020 Jul 31 1231 UTC
:Product: documentation at http://www.sidc.be/products/meu
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# DAILY BULLETIN ON SOLAR AND GEOMAGNETIC ACTIVITY from the SIDC     #
# (RWC Belgium)                                                      #
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SIDC URSIGRAM 00731
SIDC SOLAR BULLETIN 31 Jul 2020, 1230UT
SIDC FORECAST (valid from 1230UT, 31 Jul 2020 until 02 Aug 2020)
SOLAR FLARES  : Quiet conditions (<50% probability of C-class flares)
GEOMAGNETISM  : Quiet (A<20 and K<4)
SOLAR PROTONS : Quiet
PREDICTIONS FOR 31 Jul 2020  10CM FLUX: 073 / AP: 003
PREDICTIONS FOR 01 Aug 2020  10CM FLUX: 073 / AP: 006
PREDICTIONS FOR 02 Aug 2020  10CM FLUX: 073 / AP: 010
COMMENT: 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 ISN  : 021, BASED ON 32 STATIONS.

SOLAR INDICES FOR 30 Jul 2020
WOLF NUMBER CATANIA    : ///
10CM SOLAR FLUX        : 073
AK CHAMBON LA FORET    : 008
AK WINGST              : 004
ESTIMATED AP           : 004
ESTIMATED ISN          : 020, BASED ON 38 STATIONS.

NOTICEABLE EVENTS SUMMARY
DAY BEGIN MAX  END  LOC    XRAY OP  10CM Catania/NOAA RADIO_BURST_TYPES 
NONE
END

BT
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Details

The SIDC ursigram starts with the code SIDC URSIGRAM YMMDD, where
Y is the last digit of the year number,
MM is the number of the month,
DD is the day of the month.

A forecast is given on:
the global flare probability,
geomagnetic disturbances,
solar proton events.
PREDICTIONS FOR “today” : 10CM FLUX: xxx / AP: xxx
PREDICTIONS FOR “today+1”: 10CM FLUX: xxx / AP: xxx
PREDICTIONS FOR “today+2”: 10CM FLUX: xxx / AP: xxx
COMMENT
ESTIMATED ISN : xxx, based on xx stations.
where ISN stands for International Sunspot Number.


OBSERVED SOLAR INDICES FOR THE DAY BEFORE
SUNSPOT INDEX : xxx, the Wolf number observed by Catania
10CM SOLAR FLUX : xxx,
AK CHAMBON LA FORET : xxx,
AK WINGST : xxx,
ESTIMATED AP : xxx,
ESTIMATED ISN : xxx, based on xx stations.


NOTICEABLE EVENTS SUMMARY
DAY BEGIN MAX END LOC XRAY OP 10CM TYPE Catania NOAA NOTE

DAY gives the day-of-the-month.
BEGIN, MAX and END give the UT time of the different phases of the X-ray output of the event.
LOC gives the location of the event in heliographic coordinates.
XRAY gives the GOES X-ray class of the event.
OP lists the optical flare class.
10cm gives the 10.7 cm radioflux output of the event.
TYPE specifies the type of radiobursts observed.
Catania gives the Catania sunspot group number where the event happened.
NOAA is the corresponding NOAA active region number.
NOTE is the header of any other type of information, e.g. if a CME was observed associated with the event.