26,572 research outputs found
The Impulsive Phase in Solar Flares: Recent Multi-wavelength Results and their Implications for Microwave Modeling and Observations
This short paper reviews several recent key observations of the processes
occurring in the lower atmosphere (chromosphere and photosphere) during flares.
These are: evidence for compact and fragmentary structure in the flare
chromosphere, the conditions in optical flare footpoints, step-like variations
in the magnetic field during the flare impulsive phase, and hot, dense
'chromospheric' footpoints. The implications of these observations for
microwaves are also discussed.Comment: 6 pages, 5 figures, presented at 'Solar Physics with Radio
Observations' Symposium, November 2012, Nagoya, Japa
A Tuner that Accelerates Parameters
We propose a tuner, suitable for adaptive control and (in its discrete-time
version) adaptive filtering applications, that sets the second derivative of
the parameter estimates rather than the first derivative as is done in the
overwhelming majority of the literature. Comparative stability and performance
analyses are presented.Comment: 6 pages, 4 figure
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