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| Titel |
Galactic cosmic ray electrons; A tool to predict the radiation environment at solar minimum every 22 years |
| VerfasserIn |
Bernd Heber, Jan Gieseler |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250035085
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| Zusammenfassung |
| In contrast to humans on Earth astronauts on an interplanetary journey are only protected
against galactic cosmic rays up to a few tens of GeV by heliospheric modulation. The
reduction depends on the solar activity and can vary by a few ten percent at 5Â GeV to several
orders of magnitude at a few tenth of MeV. This modulation in the heliosphere as a function
of position, energy and time is a complex combination of different physical mechanism as
described in Parker’s transport equation. The current solar minimum is the lowest observed
since the space area. In contrast to the protons the intensity of GCR electrons measured by
the Kiel Electron Telescope aboard Ulysses in 2008/2009 exceed the intensity of protons
by more than 30%. Since electrons and protons at the rigidity of interest have the
same modulation amplitude, the intensity of particles with energies >100 MeV
will increase by more than 15% when approaching real solar minimum conditions.
Such an increase has been recently observed by EPHIN aboard SOHO. Therefore
these kind of measurements are useful for predicting interplanetary radiation dose. |
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