H? Doppler-velocity fields within sites of flares in a solar active region

Solar Physics ◽  
1996 ◽  
Vol 163 (1) ◽  
pp. 121-131 ◽  
Author(s):  
Wei Li ◽  
Guoxiang Ai ◽  
Hongqi Zhang
Keyword(s):  
Active Region ◽  
Velocity Fields ◽  
Solar Active Region ◽  
Doppler Velocity

Characteristics of Soft X-Ray Radiation of the Solar Active Region NOAA 1024 Registered by the PINGVIN-M Device in July 2009

2020 ◽  
Vol 60 (7) ◽  
pp. 936-941
Author(s):  
M. I. Savchenko ◽  
P. V. Vatagin ◽  
P. B. Dmitriev ◽  
M. G. Ogurtsov ◽  
E. M. Kruglov ◽  
...  
Keyword(s):  
Active Region ◽  
Solar Active Region ◽  
Active Region Noaa ◽  
X Ray ◽  
Region Noaa

scholarly journals Time-Dependent Stochastic Modeling of Solar Active Region Energy

Solar Physics ◽  
2010 ◽  
Vol 266 (2) ◽  
pp. 301-321 ◽  
Author(s):  
M. Kanazir ◽  
M. S. Wheatland
Keyword(s):  
Active Region ◽  
Stochastic Modeling ◽  
Solar Active Region ◽  
Time Dependent

scholarly journals An observation of solar active region expansion into the heliosphere

2013 ◽  
Vol 433 (1) ◽  
pp. L74-L78 ◽  
Author(s):  
H. Morgan
Keyword(s):  
Active Region ◽  
Solar Active Region

AWSoM MHD Simulation of a Solar Active Region with Realistic Spectral Synthesis

2021 ◽  
Author(s):  
Ward Manchester ◽  
Tong Shi ◽  
Ward Manchester ◽  
Enrico Landi ◽  
Bart Van Der Holst ◽  
...  
Keyword(s):  
Active Region ◽  
Spectral Synthesis ◽  
Solar Active Region ◽  
Mhd Simulation

A Variational Method for Filling in Missing Data in Doppler Velocity Fields

2021 ◽  
Author(s):  
VINCENT T. WOOD ◽  
ROBERT P. DAVIES-JONES ◽  
ALAN SHAPIRO
Keyword(s):  
Missing Data ◽  
Doppler Radar ◽  
Signal To Noise Ratio ◽  
Original Data ◽  
Radar Data ◽  
Velocity Fields ◽  
Doppler Velocity ◽  
Doppler Radar Data ◽  
Ground Clutter ◽  
Tornado Warnings

AbstractSingle-Doppler radar data are often missing in important regions of a severe storm due to low return power, low signal-to-noise ratio, ground clutter associated with normal and anomalous propagation, and missing radials associated with partial or total beam blockage. Missing data impact the ability of WSR-88D algorithms to detect severe weather. To aid the algorithms, we develop a variational technique that fills in Doppler velocity data voids smoothly by minimizing Doppler velocity gradients while not modifying good data. This method provides estimates of the analysed variable in data voids without creating extrema.Actual single-Doppler radar data of four tornadoes are used to demonstrate the variational algorithm. In two cases, data are missing in the original data, and in the other two, data are voided artificially. The filled-in data match the voided data well in smoothly varying Doppler velocity fields. Near singularities such as tornadic vortex signatures, the match is poor as anticipated. The algorithm does not create any velocity peaks in the former data voids, thus preventing false triggering of tornado warnings. Doppler circulation is used herein as a far-field tornado detection and advance-warning parameter. In almost all cases, the measured circulation is quite insensitive to the data that have been voided and then filled. The tornado threat is still apparent.

scholarly journals Cancellation analysis of current density in solar active region NOAA10019

2015 ◽  
Vol 5 ◽  
pp. A28 ◽  
Author(s):  
Gaetano De Vita ◽  
Antonio Vecchio ◽  
Luca Sorriso-Valvo ◽  
Carine Briand ◽  
Leonardo Primavera ◽  
...  
Keyword(s):  
Active Region ◽  
Current Density ◽  
Solar Active Region

scholarly journals The Trigger Mechanism of Recurrent Solar Active Region Jets Revealed by the Magnetic Properties of a Coronal Geyser Site

2020 ◽  
Vol 891 (2) ◽  
pp. 149
Author(s):  
Alin Razvan Paraschiv ◽  
Alina Donea ◽  
K. D. Leka
Keyword(s):  
Magnetic Properties ◽  
Active Region ◽  
Solar Active Region ◽  
Trigger Mechanism

An Investigation into the Variability of Heating in a Solar Active Region

2006 ◽  
Vol 643 (2) ◽  
pp. 1245-1257 ◽  
Author(s):  
Ignacio Ugarte‐Urra ◽  
Amy R. Winebarger ◽  
Harry P. Warren
Keyword(s):  
Active Region ◽  
Solar Active Region

scholarly journals Eigenspectra of solar active region long-period oscillations

2021 ◽  
Author(s):  
G. Dumbadze ◽  
B.M. Shergelashvili ◽  
S. Poedts ◽  
T.V. Zaqarashvili ◽  
M. Khodachenko ◽  
...  
Keyword(s):  
Active Region ◽  
Solar Active Region ◽  
Long Period
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