Far Ultraviolet Imaging from the Image Spacecraft. 2. Wideband FUV Imaging

Mende, S. B.; Heetderks, H.; Frey, H. U.; Lampton, M.; Geller, S. P.; Abiad, R.; Siegmund, Oswald H. W.; Tremsin, Anton S.; Spann, James F.; Dougani, H.; Fuselier, S. A.; Magoncelli, A. L.; Bumala, M. B.; Murphree, S.; Trondsen, T.

doi:10.1007/978-94-011-4233-5_9

Cited by 190 publications

(197 citation statements)

References 4 publications

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“…[7] In this study we use a subset of substorms identified by Frey et al [2004] from images of the northern hemispheric auroral oval made by the far ultraviolet (FUV) instrument on board the IMAGE spacecraft [Mende et al, 2000a[Mende et al, , 2000b. The FUV instrument consisted of a wideband imaging camera (WIC), and two Spectrographic Imagers, SI12 and SI13.…”

Section: Methodsmentioning

confidence: 99%

A superposed epoch investigation of the relation between magnetospheric solar wind driving and substorm dynamics with geosynchronous particle injection signatures

et al. 2011

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Section: Methodsmentioning

confidence: 99%

A superposed epoch investigation of the relation between magnetospheric solar wind driving and substorm dynamics with geosynchronous particle injection signatures

et al. 2011

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“…Monitoring of less energetic precipitation has been provided by the Far Ultra Violet (FUV) camera on board the IMAGE spacecraft (Mende et al, 2000). The energy of the particles that produce emission in the far UV (∼1-15 keV) overlaps the lower energy of those that produce some cosmic radio absorption in the ionosphere.…”

Section: Instrumentationmentioning

confidence: 99%

Energetic electron precipitation during sawtooth injections

Kavanagh

Donovan

et al. 2007

Ann. Geophys.

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Abstract. We present simultaneous riometer observations of cosmic noise absorption in the nightside and dawn-noon sectors during sawtooth particle injections during 18 April 2002. Energetic electron precipitation (>30 keV) is a feature of magnetospheric substorms and cosmic radio noise absorption acts as a proxy for qualitatively measuring this precipitation. This event provides an opportunity to compare the absorption that accompanies periodic electron injections with the accepted paradigm of substorm-related absorption. We consider whether the absorption is consistent with the premise that these injections are quasi-periodic substorms and study the effects of sustained activity on the level of precipitation. Four consecutive electron injection events have been identified from the LANL (Los Alamos National Laboratory) geosynchronous data; the first two showing that additional activity can occur within the 2-4 h sawtooth periodicity. The first three events have accompanying absorption on the nightside that demonstrate good agreement with the expected pattern of substorm-absorption: discrete spike events with poleward motion at the onset followed by equatorward moving structures and more diffuse absorption, correlated with optical observations. Dayside absorption is linked to gradient-curvature drifting electrons observed at geostationary orbit and it is shown that low fluxes can lead to a lack of absorption as precipitation is suppressed; precipitation begins when the drifting electron flux surpasses some critical level following continuous injections of electrons from the magnetotail. In addition it is shown that the apparent motion of absorption determined from an azimuthal chain of riometers exhibits an acceleration that may be indicative of an energisation of the drifting electron population.

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“…The Far Ultraviolet Camera Wideband Imaging Camera (WIC) provides global maps of the terrestrial aurora, in the spectral region from 140-190 nm. The WIC is mounted on the rotating IMAGE spacecraft viewing radially outward and has a field-of-view of 17 • in the direction parallel to the spacecraft spin axis (Mende et al, 2000). 3 The statistical analysis Mende et al (2003) utilised the IMAGE FUV instrument to study the aurora in broad band using the WIC camera.…”

Section: Instrumentationmentioning

confidence: 99%

Statistical study of high-latitude plasma flow during magnetospheric substorms

et al. 2004

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Abstract.We have utilised the near-global imaging capabilities of the Northern Hemisphere SuperDARN radars, to perform a statistical superposed epoch analysis of high-latitude plasma flows during magnetospheric substorms. The study involved 67 substorms, identified using the IMAGE FUV space-borne auroral imager. A substorm co-ordinate system was developed, centred on the magnetic local time and magnetic latitude of substorm onset determined from the auroral images. The plasma flow vectors from all 67 intervals were combined, creating global statistical plasma flow patterns and backscatter occurrence statistics during the substorm growth and expansion phases. The commencement of the substorm growth phase was clearly observed in the radar data 18-20 min before substorm onset, with an increase in the anti-sunward component of the plasma velocity flowing across dawn sector of the polar cap and a peak in the dawnto-dusk transpolar voltage. Nightside backscatter moved to lower latitudes as the growth phase progressed. At substorm onset a flow suppression region was observed on the nightside, with fast flows surrounding the suppressed flow region. The dawn-to-dusk transpolar voltage increased from ∼40 kV just before substorm onset to ∼75 kV 12 min after onset. The low-latitude return flow started to increase at substorm onset and continued to increase until 8 min after onset. The velocity flowing across the polar-cap peaked 12-14 min after onset. This increase in the flux of the polar cap and the excitation of large-scale plasma flow occurred even though the IMF B z component was increasing (becoming less negative) during most of this time. This study is the first to statistically prove that nightside reconnection creates magnetic flux and excites high-latitude plasma flow in a similar way to dayside reconnection and that dayside and nightside reconnection, are two separate time-dependent processes.

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Far Ultraviolet Imaging from the Image Spacecraft. 2. Wideband FUV Imaging

Cited by 190 publications

References 4 publications

A superposed epoch investigation of the relation between magnetospheric solar wind driving and substorm dynamics with geosynchronous particle injection signatures

A superposed epoch investigation of the relation between magnetospheric solar wind driving and substorm dynamics with geosynchronous particle injection signatures

Energetic electron precipitation during sawtooth injections

Statistical study of high-latitude plasma flow during magnetospheric substorms

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