Abstract
During 2018 November 06, 11:30—18:00 UT, the MMS constellation, the Cluster set of spacecraft, and the Geotail spacecraft were all situated near the dusk flank magnetopause. Large scale fluctuations were observed by the available and operating science instruments at these various spacecraft (i.e., magnetic field, plasma moment, and energy flux measurements). Similar fluctuations were not observed by upstream solar wind monitors, suggesting that the waves were initiated at the magnetopause. A localized emission ‘bead’ from the post-noon ionosphere was also observed from low Earth orbit. The nature and relation of the fluctuations observed at all of these spacecraft at the magnetosphere boundary and the connection to the post-noon high-latitude ionosphere are investigated in this study.
Highlights
Large-scale motions of the magnetopause have long been observed by spacecraft (e.g., Holzer et al, 1966; Kaufmann and Konradi, 1969; Howe and Siscoe, 1972; Song et al, 1988, 1994; Sibeck and Croley, 1991; Sibeck, 1992; Phan and Paschmann, 1996; Sibeck and Gosling, 1996; Russell et al, 1997; Plaschke et al, 2016)
The Defense Meteorological Satellite Program (DMSP) satellite re-visited and images the northern auroral region every ~101 min, due to the precession of the magnetic dipole, subsequent passes did not provide image coverage of the same auroral region near local noon. This particular DMSP Sensor Ultraviolet Spectrographic Imager (SSUSI) observation occurred just prior to the Magnetospheric Multiscale (MMS) spacecraft encountering the flank magnetopause, this interval does coincide with the Cluster 3 and 4 observations of ULF pulsations just inside the flank magnetopause
During an extended interval on 2018 November 06, KelvinHelmholtz wave activity was observed by multiple instruments on board the MMS spacecraft at the dusk flank magnetopause
Summary
Large-scale motions of the magnetopause have long been observed by spacecraft (e.g., Holzer et al, 1966; Kaufmann and Konradi, 1969; Howe and Siscoe, 1972; Song et al, 1988, 1994; Sibeck and Croley, 1991; Sibeck, 1992; Phan and Paschmann, 1996; Sibeck and Gosling, 1996; Russell et al, 1997; Plaschke et al, 2016). This time is near the start of the larger time interval when fluctuations were observed by the various spacecraft, as FIGURE 8 | Geotail observations of the magnetic field, electron energy flux spectrograms, and proton energy flux spectrograms observed in four directions. The DMSP satellite re-visited and images the northern auroral region every ~101 min, due to the precession of the magnetic dipole, subsequent passes did not provide image coverage of the same auroral region near local noon This particular DMSP SSUSI observation occurred just prior to the MMS spacecraft encountering the flank magnetopause, this interval does coincide with the Cluster 3 and 4 observations of ULF pulsations just inside the flank magnetopause (starting ~11:30 UT). Continuing the trace to the southern hemisphere, the magnetic field line associated with the ionospheric bead passed very close to the location of Geotail
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