Blar i forfatter "Hansen, T.L."
-
Geomagnetic control of polar mesosphere summer echoes.
Bremer, J.; Hansen, T.L.; Hoffmann, P. (Journal article; Tidsskriftartikkel, 2000)Using observations with the ALOMAR SOUSY radar near Andenes (69.3°N, 16.0°E) from 1994 until 1997 polar mesosphere summer echoes (PMSE) have been investigated in dependence on geomagnetic K indices derived at the Auroral Observa- tory Tromsù (69.66°N, 18.94°E). During night-time and morning hours a significant correlation between the signal-to-noise ratio (SNR) of the radar results and ... -
Superposed epoch analysis applied to large-amplitude travelling convection vortices.
Hansen, T.L.; Lühr, H.; Rother, M.; Iyemori, T.; Lepping, R.P. (Journal article; Tidsskriftartikkel, 1998)For the six months from 1 October 1993 to 1 April 1994 the recordings of the IMAGE magnetometer network have been surveyed in a search for large- amplitude travelling convection vortices (TCVs). The restriction to large amplitudes (>100 nT) was chosen to ensure a proper detection of evens also during times of high activity. Readings of all stations of the northern half of the IMAGE network ...