Observations of ionospheric convection from the Wallops SuperDARN radar at middle latitudes
Observations of ionospheric convection from the Wallops SuperDARN radar at middle latitudes
复制标题
中纬度地区 Wallops SuperDARN 雷达对电离层对流的观测
DOI:
10.1029/2006ja011982
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发表时间:
2007
期刊:
影响因子:
--
通讯作者:
Baker J
中科院分区:
文献类型:
--
作者:
Baker J
During geomagnetic storms the ability of the Super Dual Auroral Radar Network (SuperDARN) to measure ionospheric convection becomes limited when the radars suffer from absorption and the auroral disturbance expands equatorward of the radar sites. To overcome these shortcomings, it was decided to construct a SuperDARN radar at middle latitudes on the grounds of the NASA Wallops Flight Facility. This paper presents the first comprehensive analysis of Doppler measurements from the Wallops radar, which commenced operations in May 2005. Wallops measurements are compared with the Goose Bay radar during the onset of a geomagnetic storm on 31 August 2005: Goose Bay measured the onset of geomagnetic activity at high latitude while Wallops monitored the expansion of convection to middle latitudes. Average convection patterns binned by theKpgeomagnetic index are also presented. During weak‐moderate geomagnetic activity (Kp≤ 3) the Wallops radar observes ionospheric irregularities between 50° and 60° magnetic latitude drifting westward across much of the nightside. When these measurements are incorporated into the calculation of an average SuperDARN convection pattern, the streamlines of polar cap outflow on the nightside become kinked in a manner reminiscent of the Harang discontinuity. This morphology arises quite naturally when the two‐cell convection at high latitudes merges with the prevailing westward convection at middle latitudes. During increased geomagnetic activity (Kp≥ 3), Wallops is able to measure the expansion of auroral electric fields to middle latitudes and the average SuperDARN cross‐polar cap potential is increased by 25%.
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影响因子:
1.9
作者:
Chisham, G;Freeman, MP;Sofko, G
通讯作者:
Sofko, G
DOI:
--
发表时间:
1987
期刊:
影响因子:
--
作者:
C. Senior;M. Blanc
通讯作者:
M. Blanc
DOI:
--
发表时间:
2007
期刊:
影响因子:
--
作者:
M. Watanabe;G. Sofko;D. André;Takashi Tanaka;M. Hairston
通讯作者:
M. Hairston
影响因子:
--
作者:
H. Koskinen;T. Pulkkinen
通讯作者:
T. Pulkkinen
DOI:
--
发表时间:
1987
期刊:
影响因子:
--
作者:
J. Holt;R. Wand;J. V. Evans;W. Oliver
通讯作者:
W. Oliver