Zobrazeno 1 - 10
of 116
pro vyhledávání: '"Donea, A. -C"'
We present observations of recurrent active region coronal jets and derive their thermal and non-thermal properties, by studying the physical properties of the plasma simultaneously at the base footpoint, and along the outflow of jets. The sample of
Externí odkaz:
http://arxiv.org/abs/2207.12612
The use of acoustic holography in the high-frequency $p$-mode spectrum can resolve the source distributions of enhanced acoustic emissions within halo structures surrounding active regions. In doing so, statistical methods can then be applied to asce
Externí odkaz:
http://arxiv.org/abs/1507.03447
The physics of transient seismic emission in flares remains largely mysterious. Its discoverers proposed that these "sunquakes" are the signature of a shock driven by "thick-target heating" of the flaring chromosphere. H-{\alpha} observations show ev
Externí odkaz:
http://arxiv.org/abs/1303.3299
Dynamical changes in the solar corona have proven to be very important in inducing seismic waves into the photosphere. Different mechanisms for their generation have been proposed. In this work, we explore the magnetic field forces as plausible mecha
Externí odkaz:
http://arxiv.org/abs/0902.3856
On 2005 January 15, the active region AR10720 produced an X1.2 solar flare that induced high levels of seismicity into the photospheric layers. The seismic source was detected using helioseismic holography and analysed in detail in Paper I. Egression
Externí odkaz:
http://arxiv.org/abs/0807.3783
On 10 March 2001 the active region NOAA 9368 produced an unusually impulsive solar flare in close proximity to the solar limb. This flare has previously been studied in great detail, with observations classifying it as a type 1 white-light flare with
Externí odkaz:
http://arxiv.org/abs/0801.0898
Autor:
Martinez-Oliveros, J. C., Moradi, H., Besliu-Ionescu, D., Donea, A. -C, Cally, P. S., Lindsey, C.
We carried out an electromagnetic acoustic analysis of the solar flare of 14 August 2004 in active region AR10656 from the radio to the hard X-ray spectrum. The flare was a GOES soft X-ray class M7.4 and produced a detectable sun quake, confirming ea
Externí odkaz:
http://arxiv.org/abs/0707.2019
Publikováno v:
Mon.Not.Roy.Astron.Soc.374:1155-1163,2007
We report the discovery of one of the most powerful sunquakes detected to date, produced by an X1.2-class solar flare in active region 10720 on 2005 January 15. We used helioseismic holography to image the source of seismic waves emitted into the sol
Externí odkaz:
http://arxiv.org/abs/0704.3472
Publikováno v:
New Astron.Rev. 48 (2004) 411-413
The giant radio galaxy M87 is usually classified as a Fanaroff-Riley class I source, suggesting that M87 is a mis-aligned BL Lac object. Its unresolved nuclear region emits strong non-thermal emission from radio to X-rays which has been interpreted a
Externí odkaz:
http://arxiv.org/abs/astro-ph/0402258
Autor:
Donea, A. -C., Protheroe, R. J.
Publikováno v:
Prog.Theor.Phys.Suppl. 151 (2003) 186-191
The existence of intrinsic obscuration of Fanaroff-Riley I objects is a controversial topic. M87, the nearest such object, is puzzling in that although it has very massive central black hole it has a relatively low luminosity, suggesting it is in a d
Externí odkaz:
http://arxiv.org/abs/astro-ph/0303522