Dynamic Magnetography of Solar Flaring Loops
نویسندگان
چکیده
We develop a practical forward fitting method based on the SIMPLEX algorithm with shaking, which allows the derivation of the magnetic field and other parameters along a solar flaring loop using microwave imaging spectroscopy of gyrosynchrotron emission. We illustrate the method using a model loop with spatially varying magnetic field, filled with uniform ambient density and an evenly distributed fast electron population with an isotropic, power-law energy distribution. Subject headings: Sun: flares—Sun: corona—Sun: magnetic fields—Sun: radio radiation
منابع مشابه
Plasma Sloshing in Pulse-heated Solar and Stellar Coronal Loops
INAF-Osservatorio Astronomico di Palermo, Piazza del Parlamento 1, 90134 Palermo, Italy Abstract There is evidence that coronal heating is highly intermittent, and flares are the high energy extreme. The properties of the heat pulses are difficult to constrain. Here hydrodynamic loop modeling shows that several large amplitude oscillations (∼ 20% in density) are triggered in flare light curves ...
متن کاملLooptop and Footpoint Impulsive Hard X-rays and Stochastic Electron Acceleration in Flares
The discovery of hard X-rays from tops of flaring loops by the HXT of YOHKOH represents a significant progress in the understanding of solar flares. This report describes the properties of 20 limb flares observed by YOHKOH from October 1991 to August 1998, 15 of which show detectable impulsive looptop emission. Considering the finite dynamic range (about a decade) of the detection it can be con...
متن کاملDetermination of the length of coronal loops from the decay of X-ray flares I. Solar flares observed with Yohkoh SXT
We show how to estimate the size of spatially unresolved solar and stellar coronal flaring regions from the X-ray light curve and time-resolved temperature and emission measure values during the flare decay. Bymeans of extensive hydrodynamic modeling of decaying flaring loops, we propose and test a relationship between the decay time of the light curve in the band of a specific instrument and t...
متن کاملAcoustic oscillations in solar and stellar flaring loops
Evolution of a coronal loop in response to an impulsive energy release is numerically modelled. It is shown that the loop density evolution curves exhibit quasi-periodic perturbations with the periods given approximately by the ratio of the loop length to the average sound speed, associated with the second standing harmonics of an acoustic wave. The density perturbations have a maximum near the...
متن کاملChromospheric evidence for magnetic reconnection
We study the decay phase of an M2.6 flare, observed with ground based instruments at NSO/Sac Peak and with the cluster of instruments onboard Yohkoh. The whole set of chromospheric and coronal data gives a picture consistent with the classical Kopp-Pneumanmodel of two-ribbon flares.We clearly witness new episodes of coronal energy release, most probably due to magnetic reconnection, during the ...
متن کامل