منابع مشابه
Fast X-ray Oscillations During Magnetar Flares
The giant flares produced by highly magnetized neutron stars, "magnetars," are the brightest sources of high energy radiation outside our solar system. Serendipitous observations with NASA's Rossi X-ray Timing Explorer (RXTE) of the two most recent flares resulted in the discovery of high frequency oscillations in their X-ray fluxes. The frequencies of these oscillations range from = 20 Hz to a...
متن کاملUnveiling Fast Field Oscillations through Comodulation
Phase-amplitude coupling analysis shows that theta phase modulates oscillatory activity not only within the traditional gamma band (30-100 Hz) but also at faster frequencies, called high-frequency oscillations (HFOs; 120-160 Hz). To date, however, theta-associated HFOs have been reported by only a small number of laboratories. Here we characterized coupling patterns during active waking (aWk) a...
متن کاملDamping of Fast Magnetohydrodynamic Oscillations in Quiescent Filament Threads
High-resolution observations provide evidence of the existence of small-amplitude transverse oscillations in solar filament fine structures. These oscillations are believed to represent fast magnetohydrodynamic (MHD) waves and the disturbances are seen to be damped in short timescales of the order of 1 to 4 periods. We propose that, due to the highly inhomogeneous nature of the filament plasma ...
متن کاملNovel design of a microstructured reactor allowing fast temperature oscillations
Two types of stainless steel microstructured reactors for catalytic gas-phase reactions have been developed and characterized with respect to heir thermal behaviour under non-stationary temperature conditions. One of the reactors used (FTC-I) allowed periodic temperature changes up to 00 K with a frequency of 0.05 Hz. However, a broad temperature gradient of 80 K developed inside the reactor. A...
متن کاملOn retarded canards: Complex oscillations in delayed slow-fast systems
We analyze canard explosions in delayed differential equations with a one-dimensional slow manifold. This study is applied to explore the dynamics of the van der Pol slow-fast system with delayed self-coupling. In the absence of delays, this system provides a canonical example of a canard explosion. The presence of delays significantly enriches the dynamics, and varying the delay induces canard...
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ژورنال
عنوان ژورنال: Scholarpedia
سال: 2006
ISSN: 1941-6016
DOI: 10.4249/scholarpedia.1764