Abstract
Observations of a unique cusp feature at low and mid altitudes are reported. This feature has a consistent double-peaked or “V”-shaped structure at the equatorward edge of high-latitude particle precipitation flux, and is predominantly present for high IMF B y conditions. The observations are consistent with the Crooker (‘A split separator line merging model of the dayside magnetopause’, J. Geophys. Res. 90 (1985) 12104, ‘Mapping the merging potential from the magnetopause to the ionosphere through the dayside cusp’, J. Geophys. Res. (1988) 93 7338.) antiparallel merging model, which predicts a narrow wedge-shaped cusp whose geometry depends greatly on the dawn/dusk component of the IMF. Various observations are presented at low altitudes (DE-2, Astrid-2, Munin, UARS, DMSP) and at mid altitudes (DE-1, Cluster) that suggest a highly coherent cusp feature that is consistent with the narrow, wedge-shaped cusp of Crooker (1988), and contains persistent wave signatures that are compatible with previously reported high-altitude measurements. A statistical survey of Astrid-2 and DMSP satellite data is also presented, which shows this feature to be persistent and dependent on the IMF angle at the magnetopause, as expected. Thus, the cusp signatures observed at a wide range of altitudes present a coherent picture that may be interpreted in terms of a footprint of the magnetopause current layer.
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Abbreviations
- ISEE:
-
International Sun–Earth Explorers
- GSE:
-
Geocentric Solar Ecliptic
- GSM:
-
Geocentric Solar Magnetic
- ACE:
-
Advanced Composition Explorer
- CODIF:
-
Composition and Distribution Function Analyzer
- DMSP:
-
Defense Meteorological Satellite Program
- FFT:
-
Fast Fourier Transform
- ESA:
-
European Space Agency
- HIA:
-
Hot Ion Analyzer
- MHD:
-
Magnetohydrodynamics
- UT:
-
Universal Time
- RAPID:
-
Research with Adaptive Particle Imaging Detectors
- VEFI:
-
Vector Electric Field Instrument
- SSJ:
-
Special Sensor Aurora Particle
- STAFF:
-
Spatio-Temporal Analysis of Field Fluctuations
- DE:
-
Dynamics Explorer
- HEPS:
-
High-Energy Particle Spectrometer
- MEPS:
-
Medium-Energy Particle Spectrometer
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Keith, W.R., Winningham, J.D., Goldstein, M.L. et al. Observations of a Unique Cusp Signature at Low and Mid Altitudes. Surv Geophys 26, 307–339 (2005). https://doi.org/10.1007/s10712-005-1885-1
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DOI: https://doi.org/10.1007/s10712-005-1885-1