A Solar proton event occurs when protons emitted by the Sun become accelerated to very high energies either close to the Sun during a solar flare or in interplanetary space by the shocks associated with coronal mass ejections. The proton ( Greek πρῶτον / proton "first" is a Subatomic particle with an Electric charge of one positive The Sun (Sol is the Star at the center of the Solar System. A solar flare is a violent explosion in a star's (like the Sun 's atmosphere releasing as much Energy as 6 × 1025 Joules Solar flares A coronal mass ejection (CME is an ejection of material from the solar Corona, usually observed with a white-light Coronagraph. These high energy protons cause several effects. They can penetrate the Earth's magnetic field and cause ionization in the ionosphere. Earth 's magnetic field (and the surface magnetic field) is approximately a Magnetic dipole, with one pole near the North pole (see The ionosphere is the uppermost part of the atmosphere, distinguished because it is Ionized by solar radiation The effect is similar to auroral events, the difference being that electrons and not protons are involved. The electron is a fundamental Subatomic particle that was identified and assigned the negative charge in 1897 by J Energetic solar protons are also a significant radiation hazard to spacecraft and astronauts. Radiation, as in Physics, is Energy in the form of waves or moving Subatomic particles emitted by an atom or other body as it changes from a higher energy A spacecraft is a Vehicle or machine designed for Spaceflight. An astronaut or cosmonaut (космона́вт) is a person trained
Solar protons normally have insufficient energy to penetrate through the Earth's magnetic field. However, during unusually strong solar flare events, protons can be produced with sufficient energies to penetrate deeper into the Earth's magnetosphere and ionosphere. Regions where deeper penetration can occur includes the north pole, south pole, and South Atlantic magnetic anomaly. The North Pole, also known as the Geographic North Pole or Terrestrial North Pole, is subject to the caveats explained below defined as the point in the northern The South Pole, also known as the Geographic South Pole or Terrestrial South Pole, is the southernmost point on the surface of the Earth. The South Atlantic Anomaly (or SAA is the region where Earth 's inner Van Allen radiation belt makes its closest approach to the planet's surface
Protons are charged particles and are therefore influenced by magnetic fields. The proton ( Greek πρῶτον / proton "first" is a Subatomic particle with an Electric charge of one positive When the energetic protons leave the Sun, they preferentially follow (or are guided by) the Sun's powerful magnetic field. The Sun (Sol is the Star at the center of the Solar System. When solar protons enter the domain of the Earth's magnetosphere where the magnetic fields become stronger than the solar magnetic fields, they are guided by the Earth's magnetic field into the polar regions where the majority of the Earth's magnetic field lines enter and exit. A magnetosphere' is a highly magnetized region around and possessed by an Astronomical object.
Energetic protons that are guided into the polar regions collide with atmospheric constituents and release their energy through the process of ionization. The majority of the energy is extinguished in the extreme lower region of the ionosphere (around 50-80 km in altitude). This area is particularly important to ionospheric radio communications because this is the area where most of the absorption of radio signal energy occurs. Radio propagation is a term used to explain how Radio waves behave when they are Transmitted, or are propagated from one point on the Earth The enhanced ionization produced by incoming energetic protons increases the absorption levels in the lower ionosphere and can have the effect of completely blocking all ionospheric radio communications through the polar regions. Such events are known as Polar Cap Absorption events (or PCAs). These events commence and last as long as the energy of incoming protons at approximately greater than 10 MeV (million electron volts) exceeds roughly 10 pfu (particle flux units) at geosynchronous satellite altitudes. A geosynchronous orbit is an Orbit around the Earth with an Orbital period matching the Earth's sidereal rotation period
The more severe proton events can be associated with geomagnetic storms that can cause widespread disruption to electrical grids. Electric power transmission, a process in the delivery of Electricity to consumers is the bulk transfer of electrical power However, proton events themselves are not responsible for producing anomalies in power grids, nor are they responsible for producing geomagnetic storms. Power grids are only sensitive to fluctuations in the Earth's magnetic field.
Extremely intense solar proton flares capable of producing energetic protons with energies in excess of 100 MeV can increase neutron count rates at ground levels through secondary radiation effects. These rare events are known as Ground Level Events (or GLE's).
There is no substantive scientific evidence to suggest that energetic proton events are harmful to human health at ground levels, particularly at latitudes where most of the Earth's population resides. The Earth's magnetic field is exceptionally good at preventing the radiative effects of energetic particles from reaching ground levels. High altitude commercial transpolar aircraft flights have measured increases in radiation during energetic proton events, but a warning system is in place that limits these effects by alerting pilots to lower their cruising altitudes. Aircraft flights away from the polar regions are far less likely to see an impact from solar proton events.
Significant proton radiation exposure can be experienced by astronauts who are outside of the protective shield of the Earth's magnetosphere, such as an astronaut in-transit to, or located on the Moon. However, the effects can be minimized if astronauts are in a low-Earth orbit and remain confined to the most heavily shielded regions of their spacecraft. Proton radiation levels in low earth orbit increase with orbital inclination. Therefore, the closer a spacecraft approaches the polar regions, the greater the exposure to energetic proton radiation will be.
Astronauts have reported seeing flashes or streaks of light as energetic protons interact with their optic tissues. Similar flashes and streaks of light occur when energetic protons strike the sensitive optical electronics in spacecraft (such as star trackers and other cameras). The effect can be so pronounced that during extreme events, it is not possible to obtain quality images of the Sun or stars. This can cause spacecraft to lose their orientation, which is critical if ground controllers are to maintain control.
Energetic proton storms can also electrically charge spacecraft to levels that can damage electronic components. They can also cause electronic components to behave erratically. For example, solid state memory on spacecraft can be altered, which may cause data or software contamination and result in unexpected (phantom) spacecraft commands being executed. Energetic proton storms also destroy the efficiency of the solar panels that are designed to collect and convert sunlight to electricity. During years of exposure to energetic proton activity from the Sun, spacecraft can lose a substantial amount of electrical power that may require important instruments to be turned off.
See also
References
- Solar Proton Events Affecting the Earth Environment 1976 - 2005
- NASA - Carrington Super Flare NASA May 6, 2008
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