CLUSTER-2 Multipoint Observations of the mid-Altitude ion Cusp

Details CLUSTER-2 Multipoint Observations of the mid-Altitude ion Cusp CLUSTER-2 Multipoint Observations of the mid-Altitude ion Cusp

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm22a0805b&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM22A-0805

Physics

2451 Particle Acceleration, 2463 Plasma Convection, 2724 Magnetopause, Cusp, And Boundary Layers

Scientific paper

Data provided by the Cluster Ion Spectrometry (CIS) instruments are used to survey recent CLUSTER crossings of the dayside mid-altitude (4-6 Re) cusp regions, obtained near the noon sector in August-September 2001. Large-scale separating distances between the CLUSTER satellites (~0.4- ~1.7 Re) and south-north successive crossings allow investigation of the large-scale spatial and temporal cusp dynamics under a variety of interplanetary conditions. Step-like, "saw tooth", and multiple dispersed varying features are frequently observed in response to changes of the IMF orientation and/or solar wind pressure. Individual examples will be presented to demonstrate how complex is the cusp ion precipitation evidenced by the CLUSTER fleet. Moreover, properties of the ion fountain (mainly ionospheric O+ ions) easily observed at these altitudes will be given. When available, ground-based observations are used to search for related signatures.

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