153 citations · 602 across the 33 of their papers we have counts for
33 papers
Observations of microwave emission from solar jets and comparison with MHD simulations
Costas E. Alissandrakis, Vasilis Archontis, Kostas Moraitis
We computed the thermal microwave emission from a 3D magnetohydrodynamic (MHD) simulation and compared it with observations of solar jets. The simulation treats the emergence of ma…
ALMA Observations of Solar Spicules in a Polar Coronal Hole
T. S. Bastian, C. Alissandrakis, A. Nindos +2
We report observations of solar spicules at millimeter wavelengths (mm-) using the Atacama Large Millimeter/submillimeter Array (ALMA). These are supplemented by observations in…
Giant post-flare loops in active regions with extremely strong coronal magnetic fields
Costas E. Alissandrakis, Gregory D. Fleishman, Viktor V. Fedenev +2
We report for the first time the detection of thermal free-free emission from post-flare loops at 34GHz in images from the Nobeyama Radioheliograph (NoRH). We studied 8 loops, 7 of…
Explosive Events in the Quiet Sun Near and Beyond the Solar Limb Observed with the Interface Region Imaging Spectrograph (IRIS)
C. E. Alissandrakis, J. -C. Vial
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 Spect…
The quiet Sun at mm Wavelengths as Seen by ALMA
Costas Alissandrakis, Timothy Bastian, Roman Brajša
Solar observations at sub-mm, mm and cm wavelengths offer a straightforward diagnostic of physical conditions in the solar atmosphere because they yield measurement of brightness t…
Where is the base of the Transition Region? Evidence from TRACE, SDO, IRIS and ALMA observations
C. E. Alissandrakis
Classic solar models put the Chromosphere-Corona Transition Region (CCTR} at Mm above the level, whereas rMHD models place it in a wider range of heights. Obs…
A first look at the submillimeter Sun with ALMA
C. E. Alissandrakis, T. S. Bastian, A. Nindos
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 resoluti…
First detection of metric emission from a solar surge
C. E. Alissandrakis, S. Patsourakos, A. Nindos +2
We report the first detection of metric radio emission from a surge, observed with the Nançay Radioheliograph (NRH), STEREO and other instruments. The emission was observed during…
High-resolution observations with ARTEMIS/JLS and the NRH: IV. Imaging spectroscopy of spike-like structures near the front of type-II bursts
S. Armatas, C. Bouratzis, A. Hillaris +5
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…
Multi-wavelength Observations of a Metric Type-II Event
C. E. Alissandrakis, A. Nindos, S. Patsourakos +1
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 wi…
ALMA observations of the variability of the quiet Sun at millimeter wavelengths
A. Nindos, S. Patsourakos, C. E. Alissandrakis +1
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.…
Modeling the quiet Sun cell and network emission with ALMA
C. E. Alissandrakis, A. Nindos, T. S. Bastian +1
ALMA observations of the Sun at mm- offer a unique opportunity to investigate the temperature structure of the solar chromosphere. In this article we expand our previous work on…
Transient brightenings in the quiet Sun detected by ALMA at 3 mm
A. Nindos, C. E. Alissandrakis, S. Patsourakos +1
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…
Observations of solar chromospheric oscillations at 3 mm with ALMA
S. Patsourakos, C. E. Alissandrakis, A. Nindos +1
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 w…
Measurement of the Height of the Chromospheric Network Emission from Solar Dynamics Observatory Images
C. E. Alissandrakis
We measured the height of the chromospheric network in the 1700, 1600, and 304 A wavelength bands of the Atmospheric Imaging Assembly (AIA) onboard the Solar Dynamics Observatory (…
High-resolution observations with ARTEMIS-JLS and the NRH. III. Spectroscopy and imaging of fiber bursts
C. E. Alissandrakis, C. Bouratzis, A. Hillaris
Aims: We study the characteristics of intermediate drift bursts (fibers) embedded in the July 14, 2000 large solar event. Methods: We used dynamic spectra from the acousto-optic an…
Structure of the transition region and the low corona from TRACE and SDO observations near the limb
C. E. Alissandrakis, A. Valentino
We examined the structure near the solar limb in TRACE images of the continuum and in the 1600 and 171 A bands as well as in SDO images in the continuum (from HMI) and all AIA band…
Detection of spike-like structures near the front of type-II bursts
S. Armatas, C. Bouratzis, A. Hillaris +6
Aims. We examine high time resolution dynamic spectra for fine structures in type II solar radio bursts Methods. We used data obtained with the (SAO) receiver of the Artemis-JLS (A…
Modeling of the sunspot-associated microwave emission using a new method of DEM inversion
C. E. Alissandrakis, V. M. Bogod, T. I. Kaltman +2
We developed a method to compute the temperature and density structure along the line of sight by inversion of the differential emission measure (DEM), under the assumptions of str…
First high-resolution look at the quiet Sun with ALMA at 3 mm
A. Nindos, C. E. Alissandrakis, T. S. Bastian +9
We present an overview of high resolution quiet Sun observations, from disk center to the limb, obtained with the Atacama Large mm and sub-mm Array (ALMA) at 3 mm. Seven quiet Sun…
IRIS Observations of Spicules and Structures Near the Solar Limb
C. E. Alissandrakis, J. -C. Vial, A. Koukras +2
We have analyzed IRIS spectral and slit-jaw observations of a quiet region near the South Pole. In this article we present an overview of the observations, the corrections, and the…
Center-to-limb observations of the Sun with ALMA
C. E. Alissandrakis, S. Patsourakos, A. Nindos +1
We measured the center-to-limb variation of the brightness temperature, , from ALMA full-disk images at two frequencies and inverted the solution of the transfer equation to o…
Evidence for two-loop interaction from IRIS and SDO observations of penumbral brightenings
C. E. Alissandrakis, A. Koukras, S. Patsourakos +1
We analyzed spectral and imaging data from the Interface Region Imaging Spectrograph (IRIS), images from the Atmospheric Imaging Assembly (AIA) aboard the Solar Dynamics Observator…
ALMA Observations of the Sun in Cycle 4 and Beyond
S. Wedemeyer, B. Fleck, M. Battaglia +34
This document was created by the Solar Simulations for the Atacama Large Millimeter Observatory Network (SSALMON) in preparation of the first regular observations of the Sun with t…