Zobrazeno 1 - 10
of 312
pro vyhledávání: '"Alissandrakis, C."'
Autor:
Alissandrakis, C. E., Vial, J. -C.
We study point-like explosive events (EE), characterized by emission in the far wings of spectral lines, in a quiet region near the South Pole, using Interface Region Imaging Spectrograph (IRIS) spectra at two slit positions, slit-jaw (SJ) observatio
Externí odkaz:
http://arxiv.org/abs/2301.07190
Autor:
Alissandrakis, C. E.
Classic solar models put the Chromosphere-Corona Transition Region (CCTR} at $\sim2$Mm above the $\tau_{5000} = 1$ level, whereas rMHD models place it in a wider range of heights. Observational verification is scarce. We review and discuss recent res
Externí odkaz:
http://arxiv.org/abs/2207.03159
We present the first full-disk solar images obtained with the Atacama Large Millimeter/submillimeter Array (ALMA) in Band 7 (0.86 mm; 347 GHz). In spite of the low spatial resolution (21"), several interesting results were obtained. During our observ
Externí odkaz:
http://arxiv.org/abs/2205.01008
Publikováno v:
A&A 662, A14 (2022)
We report the first detection of metric radio emission from a surge, observed with the Nan\c{c}ay Radioheliograph (NRH), STEREO and other instruments. The emission was observed during the late phase of the M9 complex event SOL2010-02-012T11:25:00, de
Externí odkaz:
http://arxiv.org/abs/2203.01043
Autor:
Armatas, S., Bouratzis, C., Hillaris, A., Alissandrakis, C. E., Preka-Papadema, P., Kontogeorgos, A., Tsitsipis, P., Moussas, X.
Publikováno v:
A&A 659, A198 (2022)
Narrowband bursts (spikes) appear on dynamic spectra from microwave to decametric frequencies. They are believed to be manifestations of small-scale energy release through magnetic reconnection. We study the position of the spike-like structures rela
Externí odkaz:
http://arxiv.org/abs/2201.07832
Publikováno v:
A&A 654, A112 (2021)
We have studied a complex metric radio event which originated in a compact flare, observed with the ARTEMIS-JLS radiospectro-graph on February 12, 2010. The event was associated with a surge observed at 195 and 304 {\AA} and with a coronal mass eject
Externí odkaz:
http://arxiv.org/abs/2108.02855
Publikováno v:
A&A 652, A92 (2021)
Using Atacama Large Millimeter/submillimeter Array (ALMA) observations of the quiet Sun at 1.26 and 3 mm, we study spatially resolved oscillations and transient brightenings, i.e. small, weak events of energy release. Both phenomena may have a bearin
Externí odkaz:
http://arxiv.org/abs/2106.04220
Publikováno v:
A&A 640, A57 (2020)
ALMA observations of the Sun at mm-$\lambda$ offer a unique opportunity to investigate the temperature structure of the solar chromosphere. In this article we expand our previous work on modeling the chromospheric temperature of the quiet Sun, by inc
Externí odkaz:
http://arxiv.org/abs/2006.09886
Publikováno v:
A&A 638, A62 (2020)
Using ALMA observations, we performed the first systematic survey for transient brightenings (i.e. weak, small-scale episodes of energy release) in the quiet solar chromosphere at 3 mm. Our dataset included images of six 87'' x 87'' regions of the qu
Externí odkaz:
http://arxiv.org/abs/2004.07591
Publikováno v:
A&A 634, A86 (2020)
We studied chromospheric oscillations using Atacama Large millimeter and sub-millimeter Array (ALMA) time-series of interferometric observations of the quiet Sun obtained at 3 mm with a 2-s cadence and a spatial resolution of a few arcsec. The same a
Externí odkaz:
http://arxiv.org/abs/1912.03480