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47271
From: Eve, [DNS_Address]
Subject: proton flux increasing
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currently > 10 MeV Fluxes of particles with energies ≥ 10 MeV can reach 43,500 protons/cm2/sec/ster. Single Event Upset rates in spacecraft electronics increase with high fluxes since there is a higher likelihood of impact on a sensitive location. graph at link Proton Event ALERTS are issued upon confirmation of ≥10 Mev or ≥100 MeV Integral Flux exceeding certain thresholds. Initial ALERTS for ≥10 MeV and ≥100 MeV energies are issued for integral flux reaching or exceeding 10 pfu and 1 pfu, respectively. |
47273
From: Eve, [DNS_Address]
Subject: Re: proton flux increasing (radiation storm still in progress)
URL: https://www.swpc.noaa.gov/phenomena/solar-radiation-storm
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SOLAR RADIATION STORM Solar radiation storms occur when a large-scale magnetic eruption, often causing a coronal mass ejection and associated solar flare, accelerates charged particles in the solar atmosphere to very high velocities. The most important particles are protons which can get accelerated to large fractions of the speed of light. At these velocities, the protons can traverse the 150 million km from sun to Earth in just 10’s of minutes or less. When they reach Earth, the fast moving protons penetrate the magnetosphere that shields Earth from lower energy charged particles. Once inside the magnetosphere, the particles are guided down the magnetic field lines and penetrate into the atmosphere near the north and south poles. NOAA categorizes Solar Radiation Storms using the NOAA Space Weather Scale on a scale from S1 - S5. The scale is based on measurements of energetic protons taken by the GOES satellite in geosynchronous orbit. The start of a Solar Radiation Storm is defined as the time when the flux of protons at energies ≥ 10 MeV equals or exceeds 10 proton flux units (1 pfu = 1 particle*cm-2*s- 1*ster-1). The end of a Solar Radiation Storm is defined as the last time when the flux of ≥ 10 MeV protons is measured at or above 10 pfu. This definition allows multiple injections from flares and interplanetary shocks to be encompassed by a single Solar Radiation Storm. A Solar Radiation Storm can persist for time periods ranging from hours to days. Solar Radiation Storms cause several impacts near Earth. When energetic protons collide with satellites or humans in space, they can penetrate deep into the object that they collide with and cause damage to electronic circuits or biological DNA. During the more extreme Solar Radiation Storms, passengers and crew in high flying aircraft at high latitudes may be exposed to radiation risk. Also, when the energetic protons collide with the atmosphere, they ionize the atoms and molecules thus creating free electrons. These electrons create a layer near the bottom of the ionosphere that can absorb High Frequency (HF) radio waves making radio communication difficult or impossible. SWPC currently forecasts the probability of S1 (Minor Radiation Storm) occurrence as part of our 3-day forecast and forecast discussion products and issues a warning for an expected S1 or higher event; as well as a warning for when the 100 MeV proton level is expected to reach 1 pfu. Additionally, SWPC issues alerts for when each NOAA Space Weather Scale Radiation Storm level is reached (S1- S5) and/or when the 100 MeV protons reach 1 pfu. |
47278
From: Eve, [DNS_Address]
Subject: Re: proton flux increasing (radiation storm still in progress)
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Large CME Observed March 13, 2023 @ 09:55 UTC An energetic eruption on the Sun was observed early this morning. A full halo coronal mass ejection (CME) was captured by LASCO C2 and the source appears to have been beyond the east limb on the farside. Despite being a farsided event, it was powerful enough to push low energy proton levels to the minor (S1) radiation storm threshold. Other than this, no other impacts are expected at this time. Perhaps a large sunspot to look forward to in the future! 
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Responses:
[47279]
47279
From: Eve, [DNS_Address]
Subject: Re: proton flux increasing (radiation storm still in progress)
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S1 (Minor) Solar Radiation Storm Event Began 13 March, 2023 published: Tuesday, March 14, 2023 14:50 UTC A Minor (S1) Solar Radiation Storm began on 13 March, 2023. The S1 threshold was first reached at 3:45 am EDT (13/0745 UTC) on 13 March. |
Responses:
None
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