Auroral hiss

spaceweb@oulu.fi - last update: 2 December 1998, 1000 UT (RR)

Auroral hiss consists of broad band, often continuous and featureless emissions at 1-500 kHz. It is related to auroral arcs, i.e., dusk and evening side discrete auroras. Because of this, field-aligned potential drops must play some role hiss production, just like in AKR.

Auroral hiss is characterised by a sharp low-frequency cutoff near the local lower hybrid resonance frequency, and a high-frequency cutoff at the local plasma frequency or local electron cyclotron frequency f_ce.

For more information see, e.g., Bering et al. (1987) and Bahnsen et al. (1987).

References

• Bahnsen, A., M. Jespersen, E. Ungstrup, and I. B. Iversen, Auroral hiss and kilometric radiation measured form the Viking satellite, Geophys. Res. Lett., 14, 471-474, 1987.
• Bering, E. A., J. E. Maggs, and H. R. Anderson, The plasma wave environment of an auroral arc 3. VLF hiss, J. Geophys. Res., 92, 7581-7605, 1987.

See also

• Space Physics Text Book of Oulu