全部文献期刊学位论文会议报纸专利标准年鉴图书|学者科研项目
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作者:E. Donovan , M. J. Engebretson ...
来源:[J].Annales Geophysicae(IF 1.518), 2018, Vol.19 (10/12), pp.1367-1398DOAJ
摘要:On 14 January 2001, the four Cluster spacecraft passed through the northern magnetospheric mantle in close conjunction to the EISCAT Svalbard Radar (ESR) and approached the post-noon dayside magnetopause over Green-land between 13:00 and 14:00 UT. During that interval, a sud...
作者:E. Donovan , E. E. Woodfield ...
来源:[J].Annales Geophysicae(IF 1.518), 2018, Vol.20 (9), pp.1321-1334DOAJ
摘要:A period (08:10–14:40 MLT, 11 February 1997) of enhanced electron density in the D- and E-regions is investigated using EISCAT, IRIS and other complementary instruments. The precipitation is determined to be due to substorm processes occurring close to magnetic midnight. Ene...
作者:E. Donovan , T. K. Yeoman ...
来源:[J].Annales Geophysicae(IF 1.518), 2018, Vol.20 (4), pp.405-426DOAJ
摘要:We present magnetospheric observations of very large amplitude global scale ULF waves, from 9 and 10 December 2000 when the upstream solar wind speed exceeded 600 km/s. We characterise these ULF waves using ground-based magnetometer, radar and optical instrumentation on both the ...
作者:E. Donovan , G. Reeves
来源:[J].Annales Geophysicae(IF 1.518), 2018, Vol.18 (9), pp.1097-1107DOAJ
摘要:We have investigated the time delay between substorm onset and related reactions in the dawn and dusk ionospheric electrojets, clearly separated from the nightside located substorm current wedge by several hours in MLT. We looked for substorm onsets occurring over Greenland, wher...
作者:E. Donovan , J. Liang
来源:[J].Annales Geophysicae(IF 1.518), 2017, Vol.35, pp.217-225DOAJ
摘要:Previous studies of the motion of patches that comprise patchy pulsating aurora (PPA) have been based on a limited number of events. In this study, we use a large database of PPA patches obtained from the THEMIS all-sky imager at Gillam (66.18° magnetic latitude, 332.78° mag...
作者:E. Grono , E. Donovan , K. R. Murphy
来源:[J].Annales Geophysicae(IF 1.518), 2017, Vol.35, pp.777-784DOAJ
摘要:Pulsating aurora is frequently observed in the evening and morning sector auroral oval. While the precipitating electrons span a wide range of energies, there is increasing evidence that the shape of pulsating auroral patches is controlled by structures in near-equatorial co...
作者:E. Donovan , P. Prikryl ...
来源:[J].Annales Geophysicae(IF 1.518), 2017, Vol.19 (10/12), pp.1683-1696DOAJ
摘要:On 7 December 2000, during 13:30–15:30 UT the MIRACLE all-sky camera at Ny Ålesund observed auroras at high-latitudes (MLAT ~ 76) simultaneously when the Cluster spacecraft were skimming the magnetopause in the same MLT sector (at ~ 16:00–18:00 MLT). The location of the...
作者:E. Donovan , E. Spanswick
来源:[J].Annales Geophysicae(IF 1.518), 2010, Vol.28 (6), pp.1307DOAJ
摘要:High-latitude irregularities can impair the operation of GPS-based devices by causing fluctuations of GPS signal amplitude and phase, also known as scintillation. Severe scintillation events lead to losses of phase lock, which result in cycle slips. We have used data from the Can...
作者:E. Donovan , I. R. Mann ...
来源:[J].Annales Geophysicae(IF 1.518), 2009, Vol.27 (2), pp.623DOAJ
摘要:We show four auroral initial brightening events at substorm onsets focusing on fine structures and their longitudinal dynamics, which were observed by all-sky TV cameras (30-Hz sampling) on January 2008, in Canada. For two initial brightenings started in the field of views o...
作者:E. Donovan , A. J. Klimas
来源:[J].Annales Geophysicae(IF 1.518), 2009, Vol.27 (2), pp.745DOAJ
摘要:Using multiscale spatiotemporal analysis of bursty precipitation events in the nighttime aurora as seen by the POLAR UVI instrument, we report a set of new statistical signatures of high- and low-latitude auroral activity, signaling a strongly non-uniform distribution of dissipat...

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