Community of European Solar Radio Astronomers – Page 20

Modulation of radio emission, fast magnetoacoustic waves and magnetic field measurements in the solar corona with LOFAR
by Kolotkov et al*

2018-08-21

Fast magnetoacoustic wave trains are a promising seismological probe of the corona, revealing the magnetic connectivity and providing the estimation of the absolute value of the coronal magnetic field. Low-frequency radio observations allow for the detection of fast wave trains in middle and upper corona, above the field-of-view of EUV imagers and spectrographs, via the modulation of the radio emission by the variations of the electron concentration. We present the […]

An Extreme-ultraviolet Wave Generating Upward Secondary Waves in a Streamer-like Solar Structure
by Ruisheng Zheng et al.*

2018-08-07

Extreme-ultraviolet (EUV) waves are spectacular horizontally propagating disturbances in the low solar corona. If an EUV wave encounters an ambient coronal structure it may trigger another horizontal wave, which is always named a ‘secondary wave’ (SW). We present the first example of upward SWs in a streamer-like structure, a bright loop-like structure developing over an active region, after the passing of an EUV wave. The EUV wave was associated with […]

Long-lasting injection of solar energetic electrons into the heliosphere
by N. Dresing et al.

2018-07-24

The solar energetic particle (SEP) event from 26 Dec 2013 was a so-called widespread event observed by multiple spacecraft. The two STEREO and one close to Earth spacecraft spanned a total longitudinal angle of 210 degrees at that time. Together with the 25 Feb 2014 (Lario et al., 2016, Klassen et al., 2016) this is the widest event ever observed with the STEREO spacecraft. Unusually long-lasting SEP anisotropies together with […]

Statistical Analysis of Solar Events Associated with storm sudden commencements in the magnetosphere
by K. Bocchialini et al.*

2018-07-10

We developed an innovative approach by studying each Earth-directed event leading to a storm sudden commencement (SSC) in the magnetosphere during 2002 (maximum activity of Cycle 23). This unprecedented, comprehensive study consists of: i) starting from the list of 32 SSCs listed by the International Service of Geomagnetic Indices (ISGI) of the Observatory de l’Ebre, ii) linking each SSC to a CME, iii) filling in the observational gaps along the […]

Topical issue “Solar radio physics from the chromosphere to near Earth” published
by E.P Kontar and A. Nindos

2018-06-26

The 2016 CESRA workshop (http://cesra2016.sciencesconf.org) had a special emphasis on the complementarity of current and future space-based observations with ground-based radio observations. It was the place to discuss the new exciting science opportunities that arise from radio instruments such as the Atacama Large Millimeter/submillimeter Array (ALMA), the Expanded Owens Valley Solar Array (EOVSA), the Expanded Very Large Array (EVLA), the Low Frequency array (LOFAR), the Mingantu Spectral Radioheliograph (MUSER), and […]

Solar Radio Burst Associated with a Falling Bright EUV Blob
by M. Karlický et al.*

2018-06-12

In several papers the thermal conduction front formed between hot and cold plasmas was studied (Brown et al. 1979, McKean et al 1990, Arber & Melnikov 2009). Karlický (2015) has studied the thermal front using a 3-D particle-in-cell electromagnetic code and found that the thermal front can produce radio emission. Here we present a very rare radio burst which we interpreted as generated by the thermal conduction front formed in […]

Properties of Decameter IIIb–III Pairs
by V. Melnik et al.*

2018-05-29

A large number of Type IIIb–III pairs, in which the ﬁrst component is a Type IIIb burst and the second one is a Type III burst, are often observed during decameter Type III burst storms. From the beginning of their detection, the question of whether the components of these pairs are the first and the second harmonics of radio emission or not has remained open. We discuss properties of decameter […]

Modeling of Solar Atmosphere Parameters Above Sunspots Using RATAN-600 Microwave Observations
by A.G. Stupishin et al.*

2018-05-15

Models of the upper transition region of sunspots have been derived based on the observed radio spectrum between 3 and 18 GHz from Radio Astronomical Telescope of the Academy of Sciences 600 (RATAN-600) observations. Our objective is to match the spectrum to show that, within the limits of the one-dimensional observations and modeling, we have obtained a reasonable description of the upper transition-region structure of sunspots. We have developed a diagnostic […]

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