Search Publications
The curious temporal behavior of the frequency of different class flares
Zhong, J.; Gao, P. X.
We investigate the frequency of all (X-ray flare events higher than class B1.0), B, C, M and X-class flares, respectively, derived from the National Geophysical Data Center (NGDC) list of solar flares between May 1983 and September 2014, which corresponds to the two complete solar cycles (SCs) 22 and 23 as well as the rise and maximum phases of SC…
Running waves observed by Hinode
Liang, H. F.; Yang, W. G.; Ma, L. +1 more
High cadence (up to 9.6 s) intensity images of a sunspot within the active region NOAA 10953 were obtained by the SOT onboard Hinode with the line H α 6563 Å on April 30, 2007. The running difference images show that running waves periodically appear within the sunspot umbra and propagate outward forming full circles or partial arcs. The propagati…
A statistical analysis of the SOT-Hinode observations of solar spicules and their wave-like behavior
Koutchmy, S.; Tavabi, E.; Ajabshirizadeh, A.
Spicules are an important very dynamical and rather cool structure extending between the solar surface and the corona. They are partly filling the space inside the chromosphere and they are surrounded by a transition thin layer. New space observations taken with the SOT of the Hinode mission shed some light on their still mysterious formation and …
Signature of slow acoustic oscillations in a non-flaring loop observed by EIS/Hinode
Srivastava, A. K.; Dwivedi, B. N.
We study intensity oscillations near the apex of a coronal loop to find the signature of MHD oscillations. We analyse the time series of the strongest Fe XII 195.12 Å image data, observed by 40″ SLOT of the EUV Imaging Spectrometer (EIS) onboard the Hinode spacecraft. Using a standard wavelet tool, we produce power spectra of intensity oscillation…
Evidence of wave harmonics in a brightened magnetic network observed from Hinode/EIS
Srivastava, A. K.
We study intensity oscillations in the upper chromosphere to search acoustic wave harmonics in a low-atmospheric solar cavity associated with a brightened magnetic network near the south pole of the Sun. We use a wavelet tool to produce power spectrum of He II 256.32 Å intensity oscillation as observed by EUV Imaging Spectrometer (EIS) onboard Hin…