GEOALERT SIDC
3-day-forecast of solar and geomagnetic activity.| Source | SIDC (RWC-Belgium) |
| Frequency | Daily |
| Format | Encoded data (ISES) |
| Mail header | GEOALERT SIDC |
| SIDC code | xut |
Latest issue
:Issued: 2024 Apr 25 1247 UTC :Product: documentation at http://www.sidc.be/products/xut #--------------------------------------------------------------------# # GEOALERT message from the SIDC (RWC-Belgium) # #--------------------------------------------------------------------# GEOALERT BRU116 UGEOA 30512 40425 1247/ 9930/ 12252 21252 38252 99999 PLAIN PREDICTIONS FOR 25 Apr 2024 10CM FLUX: 204 / AP: 007 PREDICTIONS FOR 26 Apr 2024 10CM FLUX: 204 / AP: 013 PREDICTIONS FOR 27 Apr 2024 10CM FLUX: 204 / AP: 011 Solar Active Regions and flaring: Solar flaring activity remained at high levels in the past 24 hours with multiple low M-class flares. There are 16 numbered and several unnumbered active regions on the visible solar disc. NOAA AR 3645 (beta-gamma) remains the largest region, while NOAA AR 3643 (beta-gamma-delta) and NOAA AR 3648 (beta-gamma-delta) became the most complex ones. NOAA AR 3639 (beta), NOAA AR 3646 (beta) and NOAA AR 3647 (beta) have decreased the complexity of their underlying magnetic field. The strongest activity was M2.0 flare, start time 22:54 UTC, end time 23:05 UTC, peak time 22:59 UTC on April 24th produced by NOAA AR 3637 (beta) from the west limb. The remaining M-class flaring was produced by NOAA AR 3645 and NOAA AR 3648. The solar flaring activity is expected to be at moderate to high levels over the next days with likely further M-class flaring and 25% chance for isolated X-class flaring. Coronal mass ejections: No Earth-directed coronal mass ejections (CMEs) have been observed in coronagraph imagery over the past 24 hours. Type II and type IV radio bursts were reported related to C9.4-class flaring from NOAA AR 3638 14:10 UTC on April 24th. The resulting westward CME is estimated to have no impact on Earth. Coronal holes: A positive polarity mid-latitude coronal hole is currently residing on the central meridian in the southern hemisphere. The high speed stream emanating from it might arrive to Earth on April 28th, possibly superimposed with expected preceding high speed stream arrival. Solar wind: Over the past 24 hours the solar wind parameters (ACE and DSCOVR) were indicative of background slow solar wind regime. The solar wind velocity was predominantly below 400 km/s. The interplanetary magnetic field (B) was weak with a maximum value of 4.8 nT and a minimum Bz of -3.9 nT. The B field phi angle was alternating between the negative and the positive sector (directed towards and away from the Sun). The solar wind conditions might experience mild enhancements on April 25th - April 28th with possible mild high speed streams encounters related to several positive polarity coronal holes. Geomagnetism: The geomagnetic conditions over the past 24 hours were quiet. Quiet to active conditions are anticipated for April 25th with chances for isolated minor storm levels on April26th -April 28th. Proton flux levels: Over the past 24 hours the greater than 10 MeV GOES proton flux was at background levels and is expected to continue so over the next days, pending any fast eruptive solar activity. Electron fluxes at GEO: The greater than 2 MeV electron flux as measure by GOES 16 and GOES 18 has exceeded the1000 pfu threshold over the past 24h and is expected to repeatedly exceed the 1000 pfu threshold in the upcoming days. The 24h electron fluence was at boundary of nominal to moderate level and is expected to be at moderate levels for the upcoming days. TODAY'S ESTIMATED ISN : 220, BASED ON 11 STATIONS. 99999 UGEOI 30512 40425 1247/ 24/// 1//// 21990 3002/ 4//// 8//// 9//// 99999 NOTICEABLE EVENTS SUMMARY DAY BEGIN MAX END LOC XRAY OP 10CM Catania/NOAA RADIO_BURST_TYPES 24 1207 1214 1239 ////// M1.4 60/3645 24 2227 2250 2254 ////// M1.1 73/3657 III/1VI/1 24 2254 2259 2305 ////// M2.0 59/3638 25 0140 0149 0201 ////// M1.0 60/3645 END UGEOR 30512 40425 1247/ ///// ///// 99999 USSPS 32404 23146 23222 25003 35918 01208 27004 44928 21505 28001 33411 01205 30004 41213 31403 31011 35907 21408 32011 40922 37413 33017 34812 31517 38002 10715 21304 39000 22113 0/102 42004 24226 21404 43005 23707 24409 44003 42517 21308 45000 25313 01204 46000 31422 0/102 USSPS 81202 24021 26512 17008 45029 31503 20026 35808 57422 22014 35413 37414 12003 36116 11306 15001 34413 01204 23003 33411 31302 31005 42918 34406 18006 41515 31402 19023 41622 34412 32001 31821 01202 25006 10315 24308 26002 21811 01207 28013 33509 34418 29012 23727 31405 30002 24712 11304 USSPS 21305 23156 39032 34011 35516 04211 35014 44429 31406 38001 33913 0/102 39005 40915 31304 41050 35308 54427 40026 41122 34436 44044 34813 34442 45010 42418 31313 43006 46817 01203 46005 32811 0/106 49004 41512 2/801 48012 10815 21316 52022 24009 34425 51020 24227 21407 53007 25212 01205 54002 22311 0/103 55001 21909 0/101 56002 31321 0/102 UMAGF 30503 40425 1004/ 24067 1/004 21110 30000 #--------------------------------------------------------------------# # Solar Influences Data analysis Center - RWC Belgium # # Royal Observatory of Belgium # # # # Website http://www.sidc.be. # # E-mail sidc-support@oma.be # # To unsubscribe http://www.sidc.be/registration/unsub.php # # # # Legal notices: # # - Intellectual Property Rights: # # http://www.astro.oma.be/common/internet/en/data-policy-en.pdf # # - Liability Disclaimer: # # http://www.astro.oma.be/common/internet/en/disclaimer-en.pdf # # - Use and processing of your personal information: # # http://www.astro.oma.be/common/internet/en/privacy-policy-en.pdf # #--------------------------------------------------------------------#
Details
The Geoalert message starts with the code GEOALERT BRUXXX, where xxx is the day-of-the-year number.Besides the ISES codes like UGEOA, UGEOI, UGEOR and USSPS, this message contains the following information:
PLAIN
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
99999
This gives the predicted 10.7 cm radioflux and the predicted Ap index for 3 days starting on the date of the message
NOTICEABLE EVENTS SUMMARY
DAY BEGIN MAX END LOC XRAY OP 10CM TYPE Catania NOAA NOTE
This is the header of a table that lists all major events.
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.
Check the ISES code book for information on ISES codes.