Physics
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jgra..10910203g&link_type=abstract
Journal of Geophysical Research, Volume 109, Issue A10, CiteID A10203
Physics
3
Ionosphere: Polar Cap Ionosphere, Ionosphere: Ionospheric Irregularities, Ionosphere: Electric Fields (2712), Magnetospheric Physics: Electric Fields (2411)
Scientific paper
Up to now, several tens of theories for inverted-V structure and discrete arc formation have been proposed. In about half of them the source of auroral structuring is supposed to be in the ionosphere, whereas a magnetospheric origin is inferred in others. In order to discriminate between these two classes of mechanisms, we have examined the observed direction of the high-latitude Poynting flux δP = δE × δB associated with the structured electric δE and magnetic δB fields. The upward direction of δP would indicate an ionospheric generator of these fields, while downward δP is a signature of a magnetospheric mechanism at work. The analysis was performed for scales ranging from 3.8 km to a few hundreds of kilometers in the ionosphere, meaning that the irregularities under study can be identified with discrete auroral features. The electric and magnetic field measurements of the Dynamics Explorer 2 satellite (altitudes from 300 to 1000 km) for a period of one and a half years were used. We have found that in about 95% of cases the relative orientation of δE and δB is such that δP points downward, suggesting a magnetospheric origin of electromagnetic field structuring at high latitudes. Being averaged over the polar cap, δP exhibits a steady growth with northward Bz interplanetary magnetic field (IMF) increasing, while, averaged over the auroral oval, δP grows with increasing southward Bz IMF.
Golovchanskaya I. V.
Maltsev Yu. P.
No associations
LandOfFree
On the direction of the Poynting flux related to the mesoscale electromagnetic turbulence at high latitudes does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with On the direction of the Poynting flux related to the mesoscale electromagnetic turbulence at high latitudes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On the direction of the Poynting flux related to the mesoscale electromagnetic turbulence at high latitudes will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-846884