3,391 research outputs found
New Interactive Solar Flare Modeling and Advanced Radio Diagnostics Tools
The coming years will see routine use of solar data of unprecedented spatial
and spectral resolution, time cadence, and completeness in the wavelength
domain. To capitalize on the soon to be available radio facilities such as the
expanded OVSA, SSRT and FASR, and the challenges they present in the
visualization and synthesis of the multi-frequency datasets, we propose that
realistic, sophisticated 3D active region and flare modeling is timely now and
will be a forefront of coronal studies over the coming years. Here we summarize
our 3D modeling efforts, aimed at forward fitting of imaging spectroscopy data,
and describe currently available 3D modeling tools. We also discuss plans for
future generalization of our modeling tools.Comment: 4 pages; IAU Symposium # 274 "Advances in Plasma Astrophysics"; typo
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Cold, tenuous solar flare: acceleration without heating
We report the observation of an unusual cold, tenuous solar flare, which
reveals itself via numerous and prominent non-thermal manifestations, while
lacking any noticeable thermal emission signature. RHESSI hard X-rays and
0.1-18 GHz radio data from OVSA and Phoenix-2 show copious electron
acceleration (10^35 electrons per second above 10 keV) typical for GOES M-class
flares with electrons energies up to 100 keV, but GOES temperatures not
exceeding 6.1 MK. The imaging, temporal, and spectral characteristics of the
flare have led us to a firm conclusion that the bulk of the microwave continuum
emission from this flare was produced directly in the acceleration region. The
implications of this finding for the flaring energy release and particle
acceleration are discussed.Comment: ApJ Letters accepted; 5 figure
Dynamic Magnetography of Solar Flaring Loops
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.Comment: ApJ Letters, in pres
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