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Magnetohydrodynamic Wave Diagnostics of the Solar Atmosphere in the Era of Transformative High-Resolution Observations
EC | FP7 | SP2 | ERC
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Special Clause 39
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  • Effect of a radiation cooling and heating function on standing longitudinal\ud oscillations in coronal loops\ud

    Kumar, Sanjay; Nakariakov, V. M. (Valery M.); Moon, Y. -J. (2016)
    Projects: EC | SEISMOSUN (321141)
    Standing long-period (with the periods longer than several minutes) oscillations in large hot (with the temperature higher than 3 MK) coronal loops have been observed as the quasi-periodic modulation of the EUV and microwave intensity emission and the Doppler shift of coronal emission lines, and have been interpreted as standing slow magnetoacoustic (longitudinal) oscillations. Quasi-periodic pulsations of shorter periods, detected in thermal and non-thermal emissions in solar flares could be...

    3D Reconstruction of Coronal Loops by the Principal Component Analysis

    Nistico, Giuseppe; Verwichte, Erwin; Nakariakov, Valery M. (2013)
    Projects: EC | SEISMOSUN (321141)
    Knowing the three dimensional structure of plasma filaments in the uppermost part of the solar atmosphere, known as coronal loops, and especially their length, is an important parameter in the wave-based diagnostics of this part of the Sun. The combination of observations of the Sun from different points of observations in space, thanks to the most recent missions, including the Solar Dynamics Observatory (SDO) and the Solar TErrestrial RElations Observatory (STEREO), allows us to infer infor...

    Fast magnetoacoustic wave trains of sausage symmetry in cylindrical waveguides of the solar corona

    Shestov, S.; Nakariakov, V. M.; Kuzin, S. (2015)
    Projects: EC | SEISMOSUN (321141)
    Fast magnetoacoustic waves guided along the magnetic field by plasma non-uniformities, in particular coronal loops, fibrils and plumes, are known to be highly dispersive, which leads to the formation of quasi-periodic wave trains excited by a broadband impulsive driver, e.g. a solar flare. We investigated effects of cylindrical geometry on the fast sausage wave train formation. We performed magnetohydrodynamic numerical simulations of fast magnetoacoustic perturbations of a sausage symmetry, ...

    Observation of a Short Period Quasi-Periodic Pulsation in Solar X-ray, Microwave and EUV Emissions

    Kumar, Pankaj; Nakariakov, Valery M.; Cho, Kyung-Suk (2017)
    Projects: EC | SEISMOSUN (321141)
    This paper presents the multi-wavelength analysis of a 13 s quasi-periodic pulsation (QPP) observed in hard X-ray (12-300 keV) and microwave (4.9-34 GHz) emissions during a C-class flare occurred on 21 September 2015. AIA 304 and 171 \AA~ images show an emerging loop/flux tube (L1) moving radially outward, which interacts with preexisting structures within the active region. The QPP was observed during the expansion and rising motion of L1. The Nobeyama Radioheliograph (NoRH) microwave images...

    Radial and azimuthal oscillations of halo coronal mass ejections in the Sun

    Lee, Harim; Moon, Y.-J.; Nakariakov, V. M. (2015)
    Projects: EC | SEISMOSUN (321141)
    We present the first observational detection of radial and azimuthal oscillations in full halo coronal mass ejections (HCMEs). We analyze nine HCMEs well-observed by the Large Angle and Spectrometric Coronagraph (LASCO) from 2011 February to June. Using the LASCO C3 running difference images, we estimated the instantaneous apparent speeds of the HCMEs in different radial directions from the solar disk center. We find that the development of all these HCMEs is accompanied by quasi-periodic var...

    Hilbert–Huang transform analysis of periodicities in the last two solar activity cycles

    Kolotkov, Dmitrii; Broomhall, Anne-Marie; Nakariakov, V. M. (2015)
    Projects: EC | SEISMOSUN (321141)
    We investigated periodicities associated with the last two-and-a-half solar activity cycles with the novel Hilbert–Huang transform (HHT) method. Raw data signals of five different observational proxies: the 10.7 cm radio flux intensity, the helioseismic frequency shift, and the sunspot area signals recorded from the whole solar disc, and separately from the Northern and Southern hemispheres, were expanded into a set of intrinsic modes with the ensemble empirical mode decomposition technique. ...

    A statistical study of the inferred transverse density profile of coronal loop threads observed with SDO/AIA

    Goddard, C. R.; Pascoe, D. J. (David J.); Anfinogentov, Sergey; Nakariakov, V. M. (Valery M.)
    Projects: EC | SEISMOSUN (321141)
    Aims. We carry out a statistical study of the inferred coronal loop cross-sectional density profiles using extreme ultraviolet (EUV) imaging data from the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory (SDO).\ud Methods. We analysed 233 coronal loops observed during 2015/2016. We consider three models for the density profile; the step function (model S ), the linear transition region profile (model L), and a Gaussian profile (model G). Bayesian inference is used to...

    Oscillations in stellar superflares

    Balona, L. A.; Broomhall, A. -M.; Kosovichev, A.; Nakariakov, V. M.; Pugh, C. E.; Van Doorsselaere, T. (2015)
    Projects: EC | SEISMOSUN (321141)
    Two different mechanisms may act to induce quasi-periodic pulsations (QPP) in whole-disk observations of stellar flares. One mechanism may be magneto-hydromagnetic (MHD) forces and other processes acting on flare loops as seen in the Sun. The other mechanism may be forced local acoustic oscillations due to the high-energy particle impulse generated by the flare (known as `sunquakes' in the Sun). We analyze short-cadence Kepler data of 257 flares in 75 stars to search for QPP in the flare deca...

    Transverse oscillations and stability of prominences in a magnetic field dip\ud

    Kolotkov, Dmitrii; Nisticò, Giuseppe; Nakariakov, V. M. (2016)
    Projects: EC | SEISMOSUN (321141)
    Aims. An analytical model of the global transverse oscillations and mechanical stability of a quiescent prominence in the magnetised environment with a magnetic field dip, accounting for the mirror current effect, is developed. Methods. The model is based upon the interaction of line currents through the Lorentz force. Within this concept the prominence is treated as a straight current-carrying wire, and the magnetic dip is provided by two photospheric current sources. Results. Properties of ...

    Undamped transverse oscillations of coronal loops as a self-oscillatory process

    Nakariakov, V. M. (Valery M.); Anfinogentov, Sergey; Nisticò, Giuseppe; Lee, D. -H. (2016)
    Projects: EC | SEISMOSUN (321141)
    Context. Standing transverse oscillations of coronal loops are observed to operate in two regimes, the rapidly decaying large amplitude oscillations, and undamped small amplitude oscillations. In the latter regime the damping should be compensated by energy supply, which allows the loop to perform almost monochromatic oscillations with almost constant amplitude. Different loops oscillate with different periods. The oscillation amplitude does not show dependence on the loop length or the oscil...
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