Artículo
Comparing the Properties of ICME-Induced Forbush Decreases at Earth and Mars
Freiherr von Forstner, Johan L; Guo, Jingnan; Wimmer Schweingruber, Robert F.; Dumbovic, Mateja; Janvier, Miho; Démoulin, Pascal; Veronig, Astrid; Temmer, Manuela; Papaioannou, Athanasios; Dasso, Sergio Ricardo
; Hassler, Donald M.; Zeitlin, Cary J.
![Icon](/themes/CONICETDigital/images/conicet.png)
Fecha de publicación:
03/2020
Editorial:
Blackwell Publishing
Revista:
Journal of Geophysical Research: Space Physics
ISSN:
2169-9380
e-ISSN:
2169-9402
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Forbush decreases (FDs), which are short-term drops in the flux of galactic cosmic rays, are caused by the shielding from strong and/or turbulent magnetic structures in the solar wind, especially interplanetary coronal mass ejections (ICMEs) and their associated shocks, as well as corotating interaction regions. Such events can be observed at Earth, for example, using neutron monitors, and also at many other locations in the solar system, such as on the surface of Mars with the Radiation Assessment Detector instrument onboard Mars Science Laboratory. They are often used as a proxy for detecting the arrival of ICMEs or corotating interaction regions, especially when sufficient in situ solar wind measurements are not available. We compare the properties of FDs observed at Earth and Mars, focusing on events produced by ICMEs. We find that FDs at both locations show a correlation between their total amplitude and the maximum hourly decrease, but with different proportionality factors. We explain this difference using theoretical modeling approaches and suggest that it is related to the size increase of ICMEs, and in particular their sheath regions, en route from Earth to Mars. From the FD data, we can derive the sheath broadening factor to be between about 1.5 and 1.9, agreeing with our theoretical considerations. This factor is also in line with previous measurements of the sheath evolution closer to the Sun.
Palabras clave:
FORBUSH DECREASE
,
GCR
,
ICME
,
MARS MISSION
,
MSL
,
RADIATION
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Identificadores
Colecciones
Articulos(IAFE)
Articulos de INST.DE ASTRONOMIA Y FISICA DEL ESPACIO(I)
Articulos de INST.DE ASTRONOMIA Y FISICA DEL ESPACIO(I)
Citación
Freiherr von Forstner, Johan L; Guo, Jingnan; Wimmer Schweingruber, Robert F.; Dumbovic, Mateja; Janvier, Miho; et al.; Comparing the Properties of ICME-Induced Forbush Decreases at Earth and Mars; Blackwell Publishing; Journal of Geophysical Research: Space Physics; 125; 3; 3-2020; 1-21
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