Global Oscillations and Active Regions
نویسندگان
چکیده
منابع مشابه
Magnetic field inclination and atmospheric oscillations above solar active regions
Recent observational evidence for magnetic field direction effects on helioseismic signals in sunspot penumbrae is suggestive of magnetohydrodynamic (MHD) mode conversion occurring at lower levels. This possibility is explored using wave mechanical and ray theory in a model of the Sun’s surface layers permeated by uniform inclined magnetic field. It is found that fastto-slow conversion near the...
متن کاملActive Region Oscillations
We report here on an investigation of high frequency oscillations in active regions, carried out using high cadence observations of O V 629 Å, Mg IX 368 Å and Fe XVI 335 Å with the Coronal Diagnostic Spectrometer (CDS) on SOHO. Using the techniques of wavelet analysis on various temporal series datasets, we find that certain oscillation frequencies are favoured for each line. We find furthermor...
متن کاملThe Role of Active Regions in the Generation of Torsional Oscillations
We present a model for torsional oscillations where the inhibiting effect of active region magnetic fields on turbulence locally reduces turbulent viscous torques, leading to a cycleand latitude-dependent modulation of the differential rotation. The observed depth dependence of torsional oscillations as well as their phase relationship with the sunspot butterfly diagram are reproduced quite nat...
متن کاملAtmospheric neutrino data : Active-Active × Active-Sterile oscillations
Atmospheric showers are initiated when primary cosmic rays hit the Earth’s atmosphere. Secondary mesons produced in this collision, mostly pions and kaons, decay and give rise to electron and muon neutrino and anti-neutrinos fluxes [1]. In the past Fréjus and NUSEX [2] reported a R-value (R = (μ/e)data/(μ/e)MC) consistent with one, therefore other detectors like Kamiokande, IMB and Soudan-2 [3]...
متن کاملActive Suppression of Torsional Oscillations
A problem with electrically driven vehicles is resonances in the drive train caused by elasticity and gear play. Disadvantageous effects caused by this are noticeable vibrations and high mechanical stresses due to torque oscillations. The oscillations can be damped using a control structure consisting of a nonlinear observer to estimate the torque in the gear and a controller, which computes a ...
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ژورنال
عنوان ژورنال: Australian Journal of Physics
سال: 1985
ISSN: 0004-9506
DOI: 10.1071/ph850839