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| Titel |
Experimental observations of the interplanetary magnetic field distribution in the inner heliosphere: controversial points |
| VerfasserIn |
O. V. Khabarova, V. N. Obridko |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250067074
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| Zusammenfassung |
| Interplanetary magnetic field (IMF) deviations from a Parker spiral are very often observed in
the heliosphere at different distances from the Sun. Commonly, it is supposed that the IMF in
the inner heliosphere corresponds to the Parker theory as a whole, but there is some
turbulent component that impacts a full picture of the IMF spatial and temporal
distribution and damages it. Meanwhile, the analysis of multipoint in-ecliptic IMF
measurements from 0.23 AU to 5 AU shows that the radial IMF component in the inner
heliosphere corresponds neither r-2 law nor the helicity assumption even under rough
average.
The next problematic point is an explanation of observational results on the in-ecliptic IMF
distribution shape at different AU. It is shown that a bimodal (two-humped) view of Br, RTN
(or Bx, By, GSE) distribution, well-known at 1 AU, is most brightly expressed at low
heliolatitudes at 0.7-2 AU, but it disappears with an increasing heliocentric distance. The
in-ecliptic IMF distribution shape becomes perfectly Gaussian-like at 3-4 AU. Such
behaviour of the in-ecliptic IMF can not be explained by any theory of the IMF extension in
space.
Therefore, experimental results, accumulated for the space era, demonstrates the barest
necessity of the 3-D interplanetary magnetic field picture revisiting, looking for new theories
of plasma and IMF expansion from the Sun, as well as further development of new models of
the inner heliosphere. |
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