Premium
Observations of Pi2 pulsations by the Wallops HF radar in association with substorm expansion
Author(s) -
Gjerloev J. W.,
Greenwald R. A.,
Waters C. L.,
Takahashi K.,
Sibeck D.,
Oksavik K.,
Barnes R.,
Baker J.,
Ruohoniemi J. M.
Publication year - 2007
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2007gl030492
Subject(s) - substorm , electrojet , geophysics , ionosphere , solar wind , radar , physics , geomagnetic storm , amplitude , magnetic field , geology , magnetometer , earth's magnetic field , atmospheric sciences , magnetosphere , telecommunications , quantum mechanics , computer science
We report the first sub‐auroral Pi2 pulsations observations by a SuperDARN type HF radar. The Wallops radar LOS measurements obtained at ionospheric altitudes, ∼56° magnetic latitude, 23 hour magnetic local time, are shown to be highly correlated with ground magnetic field perturbations obtained at Ottawa. The period of the Pi2 pulsations is 118 s and the m‐number is ∼2.3. The availability of both ionospheric LOS measurements and ground based magnetic field perturbations enable us to constrain the properties of the wave. A predominantly shear Alfven mode wave is able to explain both the amplitude and phase relations of our observations. Although the solar wind dynamic pressure is fairly stable the IMF Bz is highly variable thereby preventing an unambiguous identification of a solar wind trigger. Rather, magnetotail observations of a clear dipolarization and an intensification of the auroral westward electrojet producing a modest ground magnetic bay indicate that the wave is associated with the onset of a weak substorm.