10 settembre 2017 - 19:42 pm Pubblicato da

Ancora un potente brillamento solare di classe X 8.2 è stato generato ancora una volta dalla Regione attiva 2673 alle 16:06 UTC di oggi 10 settembre 2017. L’evento ha avuto inizio alle 15:35, ha raggiunto il picco alle 16:06 terminando alle 16:31 UTC. Questo è il quarto brillamento solare di classe X generato da questa regione dal 6 settembre e il secondo più potente del ciclo solare corrente (ciclo solare 24).

Questo evento è stato associato ad un tipo II (velocità stimata 928 km/s) ed emissioni radiofoniche di tipo IV, che suggerisce che è stata generata una forte eruzione di massa coronale (CME). Tuttavia, a causa della posizione di questa regione estremamente nella zona occidentale del Sole, la CME generata non avrà impatto verso la Terra.

Il brillamento di oggi di classe X 8.2 è stato il secondo più potente del ciclo solare 24, ed arriva solo 4 giorni dopo il brillamento X9.3, il più potente brillamento solare del ciclo attuale.

Ciclo solare 24 ha finora avuto 48 brillamenti di classe X.

 

L’analisi di questo evento è ancora in corso. La relazione viene aggiornata.

SWPC alerts, watches and warnings

Space Weather Message Code: ALTTP4
Serial Number: 544
Issue Time: 2017 Sep 10 1647 UTC

ALERT: Type IV Radio Emission
Begin Time: 2017 Sep 10 1608 UTC

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.

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Space Weather Message Code: ALTTP2
Serial Number: 1062
Issue Time: 2017 Sep 10 1647 UTC

ALERT: Type II Radio Emission
Begin Time: 2017 Sep 10 1608 UTC
Estimated Velocity: 928 km/s

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

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Space Weather Message Code: ALTPC0
Serial Number: 44
Issue Time: 2017 Sep 10 1640 UTC

ALERT: Proton Event 100MeV Integral Flux exceeded 1pfu
Begin Time: 2017 Sep 10 1625 UTC

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: An enhancement in the energetic portion of the solar radiation spectrum may indicate increased biological risk to astronauts or passengers and crew in high latitude, high altitude flights. Additionally, energetic particles may represent an increased risk to all satellite systems susceptible to single event effects. This information should be used in conjunction with the current Solar Radiation Storm conditions when assessing overall impact.

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Space Weather Message Code: WARPX1
Serial Number: 469
Issue Time: 2017 Sep 10 1632 UTC

WARNING: Proton 10MeV Integral Flux above 10pfu expected
Valid From: 2017 Sep 10 1630 UTC
Valid To: 2017 Sep 10 2359 UTC
Warning Condition: Onset
Predicted NOAA Scale: S2 – Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Radiation – Passengers and crew in high latitude, high altitude flights may experience small, increased radiation exposures.
Spacecraft – Infrequent single-event upsets to satellites are possible.
Radio – Small effects on polar HF (high frequency) propagation resulting in fades at lower frequencies.

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Space Weather Message Code: WARPC0
Serial Number: 82
Issue Time: 2017 Sep 10 1632 UTC

WARNING: Proton 100MeV Integral Flux above 1pfu expected
Valid From: 2017 Sep 10 1630 UTC
Valid To: 2017 Sep 10 2359 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: An enhancement in the energetic portion of the solar radiation spectrum may indicate increased biological risk to astronauts or passengers and crew in high latitude, high altitude flights. Additionally, energetic particles may represent an increased risk to all satellite systems susceptible to single event effects. This information should be used in conjunction with the current Solar Radiation Storm conditions when assessing overall impact.

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Space Weather Message Code: ALTXMF
Serial Number: 273
Issue Time: 2017 Sep 10 1558 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2017 Sep 10 1553 UTC
NOAA Scale: R2 – Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.

Featured image: X8.2 solar flare erupts from Region 2673. Credit: NASA/SDO AIA 131. Acquired: 16:28 UTC

Fonte: The Watchers 

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