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Found 11 entries in the Bibliography.

Showing entries from 1 through 11

2020

This paper reviews our current understanding of auroral features that appear poleward of the main auroral oval within the polar cap, especially those that are known as Sun-aligned arcs, transpolar arcs, or theta auroras. They tend to appear predominantly during periods of quiet geomagnetic activity or northwards directed interplanetary magnetic field (IMF). We also introduce polar rain aurora which has been considered as a phenomenon on open field lines. We describe the morphology of such auroras, their development and dynamics in response to solar wind-magnetosphere coupling processes, and the models that have been developed to explain them.

Hosokawa, Keisuke; Kullen, Anita; Milan, Steve; Reidy, Jade; Zou, Ying; Frey, Harald; Maggiolo, Romain; Fear, Robert;

Published by: Space Science Reviews Published on: 02/2020

YEAR: 2020 DOI: 10.1007/s11214-020-0637-3

2015

Transpolar arc observation after solar wind entry into the high-latitude magnetosphere

Recently, Cluster observations have revealed the presence of new regions of solar wind plasma entry at the high-latitude magnetospheric lobes tailward of the cusp region, mostly during periods of northward interplanetary magnetic field. In this study, observations from the Global Ultraviolet Imager (GUVI) experiment on board the TIMED spacecraft and Wideband Imaging Camera imager on board the IMAGE satellite are used to investigate a possible link between solar wind entry and the formation of transpolar arcs in the polar cap. We focus on a case when transpolar arc formation was observed twice right after the two solar wind entry events were detected by the Cluster spacecraft. In addition, GUVI and IMAGE observations show a simultaneous occurrence of auroral activity at low and high latitudes after the second entry event, possibly indicating a two-part structure of the continuous band of the transpolar arc.

Mailyan, B.; Shi, Q.; Kullen, A.; Maggiolo, R.; Zhang, Y.; Fear, R.; Zong, Q.-G.; Fu, S; Gou, X.; Cao, X.; Yao, Z.; Sun, W.; Wei, Y.; Pu, Z;

Published by: Journal of Geophysical Research: Space Physics Published on: 05/2015

YEAR: 2015 DOI: 10.1002/2014JA020912

magnetosphere-ionosphere coupling; transpolar arcs; in situ measurements

Solar illumination control of ionospheric outflow above polar cap arcs

We measure the flux density, composition, and energy of outflowing ions above the polar cap, accelerated by quasi-static electric fields parallel to the magnetic field and associated with polar cap arcs, using Cluster. Mapping the spacecraft position to its ionospheric foot point, we analyze the dependence of these parameters on the solar zenith angle (SZA). We find a clear transition at SZA between \~94\textdegree and \~107\textdegree, with the O⁺ flux higher above the sunlit ionosphere. This dependence on the illumination of the local ionosphere indicates that significant O⁺ upflow occurs locally above the polar ionosphere. The same is found for H⁺, but to a lesser extent. This effect can result in a seasonal variation of the total ion upflow from the polar ionosphere. Furthermore, we show that low-magnitude field-aligned potential drops are preferentially observed above the sunlit ionosphere, suggesting a feedback effect of ionospheric conductivity.

Maes, L.; Maggiolo, R.; De Keyser, J.; Dandouras, I.; Fear, R.; Fontaine, D.; Haaland, S.;

Published by: Geophysical Research Letters Published on: 03/2015

YEAR: 2015 DOI: 10.1002/2014GL062972

cold ion outflow; ion upflow; polar cap arc; polar ionosphere; polar wind; solar illumination

Auroral arcs and ion outflow

Figure 4.3 Image of the northern polar cap from the GUVI experiment onboard the TIMED Bottom right: detail of the polar cap arc detected by GUVI. Top left: Cluster HIA observation

Maggiolo, Romain;

Published by: Auroral Dynamics and Space Weather, edited by: Zhang, Y. and Paxton, LJ Published on:

YEAR: 2015 DOI:

2014

The relationship between solar wind entry processes and transpolar arc formation

Mailyan, Bagrat; Shi, Quanqi; Maggiolo, Romain; Zong, Qiugang; Cao, Xin; Zhang, Yongliang; Yao, Zhonghua; Fu, SuiYan; Wei, Yong; Pu, Zuyin;

Published by: Published on:

YEAR: 2014 DOI:

Connection between high-latitude arcs and the low-latitude boundary layer during periods of northward IMF

Maggiolo, Romain; Fontaine, Dominique; Hosokawa, Keisuke; Maes, Lukas; Zhang, Yongliang; Fear, Robert; Cumnock, Judy; Kozlovsky, Alexander; Kullen, Anita; Milan, Steve; , others;