Download The Magnetospheric Cusps: Structure and Dynamics by Theodore A. Fritz, Shing F. Fung PDF
By Theodore A. Fritz, Shing F. Fung
This number of papers will handle the query "What is the Magnetospheric Cusp?" and what's its function within the coupling of the sunlight wind to the magnetosphere in addition to its function within the approaches of particle delivery and energization in the magnetosphere. The cusps have usually been defined as slender funnel-shaped areas that supply a spotlight of the Chapman-Ferraro currents that circulation at the magnetopause, a boundary among the hollow space ruled through the geomagnetic box (i.e., the magnetosphere) and the exterior quarter of the interplanetary medium. Measurements from a few fresh satellite tv for pc courses have proven that the cusp isn't limited to a slim zone close to neighborhood midday yet seems to surround a wide section of the dayside high-latitude magnetosphere. it seems that the cusp is an immense resource zone for the construction of vigorous charged debris for the magnetosphere. This booklet can be of significant curiosity to scientists in house Physics in addition to to these operating in study enterprises in governments and industries, college departments of physics, astronomy, area physics, and geophysics. a part of this publication has already been released in a magazine.
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Extra resources for The Magnetospheric Cusps: Structure and Dynamics
Sample text
We find here that the ion pressure scales in proportion to the magnetic pressure better than the density does. 4, which have been analysed with both the DA and curlometer. Sharp boundaries exist through the central interval 01:00–02:20 UT, as seen in the left panel of Figure 16, for 2 March 2002. The results from two of these are quoted in Table I, along with the magnetopause exit at 03:30 UT. The first crossing, labelled ‘‘throat’’ crossing, is interpreted as the second clear entry into the dayside boundary region (as discussed in Section 3) from the cusp throat.
The calculated boundary thickness in the Table gives almost constant values and is estimated as 800–900 km (but note that this represents only the current layer). The nature of the boundary (obtained from MVA) is consistent with a simple, tangential discontinuity (TD), and comparison with the ion data shows a poorly satisfied Walen relation (analysis not shown). For the second event, on 20 February 2001, the analysis is superficially similar, although in this case only the final exit from the cusp into the magnetospheric mantle gives stable velocity results.
For example, the magnetic field trace for spacecraft 1 always leads the entry and exit through the cusp region (see Figure 9). 35) on exit into the mantle. The traversal could have occurred near the centre of the exterior cusp region, but the inner normal (with a )ZGSM component) suggests an entry on the southern edge of the cusp region. Thus, this event, at least, which appears to correspond to the northward magnetosheath conditions, provides a counter example to the appearance of an indented exterior cusp/magnetosheath interface.