Ann. Geophys., 32, 1407–1413, https://doi.org/10.5194/angeo-32-1407-2014,https://doi.org/10.5194/angeo-32-1407-2014, 2014
Acoustic-type waves are widespread in solar and space plasmas where
they contribute to energy transport and release. We discovered a new
channel for nonlinear coupling among oblique sound waves with vastly
different wavelengths across the background magnetic field. The
resulting nonlocal spectral transfer is much faster than the previously
known transfer produced by the local interactions among waves with
G. V. Drisya, D. C. Kiplangat, K. Asokan, and K. Satheesh Kumar
Ann. Geophys., 32, 1415–1425, https://doi.org/10.5194/angeo-32-1415-2014,https://doi.org/10.5194/angeo-32-1415-2014, 2014
We demonstrate that deterministic forecasting methods can make accurate short-term predictions of wind speed using past data. The predictions are remarkably accurate up to 1 hour and reasonably accurate up to 3 hours. Comparison of the results with f-ARIMA model predictions shows that the deterministic models with suitable parameters are capable of returning improved prediction accuracy and capturing the dynamical variations of the actual time series more faithfully.
M. Volwerk, K.-H. Glassmeier, M. Delva, D. Schmid, C. Koenders, I. Richter, and K. Szegö
Ann. Geophys., 32, 1441–1453, https://doi.org/10.5194/angeo-32-1441-2014,https://doi.org/10.5194/angeo-32-1441-2014, 2014
We discuss three flybys (within an 8-day time span) of comet 1P/Halley by VEGA 1, 2 and Giotto. Looking at two different plasma phenomena: mirror mode waves and field line draping; we study the differences in SW--comet interaction between these three flybys. We find that on this time scale (comparable to Rosetta's orbits) there is a significant difference, both caused by changing outgassing rate of the comet and changes in the solar wind. We discuss implications for Rosetta RPC observations.