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August 2016

On the thermal nature of 140 GHz emission from the 4 July 2012 solar flare
by Yuriy Tsap et al.*

2016-08-30

The nature of the solar flare sub-THz emission (Kaufmann, 2012) with a positive spectral slope at 200-400 GHz is still not clear [see also previous CESRA highlight]. Some authors associate this emission with thermal bremsstrahlung, while other suggest it is associated with different, non-thermal mechanisms (see Fleishman & Kontar, 2010; Krucker et al., 2013). There are two serious disadvantages of the existing approaches. First, there is a lack of observations in […]

Bright 30 THz impulsive solar bursts
by Pierre Kaufmann et al.*

2016-08-23

Impulsive 30 THz continuum bursts have been recently observed in solar flares, utilizing small telescopes with a unique and relatively simple optical setup concept (Kaufmann et al. 2015). The most intense burst was observed together with a GOES X2 class event on October 27, 2014, also detected at two sub-THz frequencies, RHESSI X-rays and SDO/HMI and EUV. It exhibits strikingly good correlation in time and in space with white light […]

Decameter U-burst Harmonic Pair from a High Loop
by Dorovskyy, Melnik, Konovalenko, Bubnov , Gridin, Shevchuk, Rucker, Poedts and Panchenko

2016-08-16

We discuss the results of recent observations of a solar U-burst harmonic pair in the frequency range 10-70 MHz, performed by the radio telescope UTR-2 and the recently built first section of the new Giant Ukrainian Radio Telescope (GURT) (see Dorovskyy et al. 2015). A considerably extended frequency range of the new telescope makes the detection of harmonically connected pairs much more probable. In particular, we focus on interpreting the time delay […]

Particle Acceleration and heating by turbulent reconnection
by L. Vlahos, T. Pisokas, H. Isliker, V. Tsiolis and A. Anastasiadis

2016-08-09

Fermi (1949) introduced a fundamental stochastic process to solve the problem of particle energization (heating and/or acceleration) in space and astrophysical plasmas. The initial idea of Fermi with randomly moving scatterers (magnetic clouds), was soon replaced with a spectrum of low amplitude (δΒ/Β<<1) waves and termed particle acceleration by MHD (weak) turbulence. In the other extreme, isolated turbulent shock waves or isolated unstable current sheets (UCS) were studied. The regime […]

Observation of a Quasi-periodic Pulsation in Hard X-Ray, Radio, and Extreme-ultraviolet Wavelengths
by Pankaj Kumar, Valery M. Nakariakov and Kyung-Suk Cho

2016-08-02

Quasi-periodic pulsations (QPPs) with periods from a few seconds to several minutes are often observed during solar/stellar flares in X-ray, radio, and optical wavelength bands. The study of QPPs is useful to understand the physical mechanism for the energy release, plasma heating, and particle acceleration during solar flares…

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Atacama Large Millimeter Array (ALMA) (11) chromosphere (13) coronal magnetic field (14) Coronal Mass Ejection (CME) (43) density fluctuations (14) electron cyclotron maser (ECM) (4) energetic electrons (14) fine spectral structures (4) free-free emission (8) Giant Metrewave Radio Telescope (GMRT) (3) gyrosynchrotron emission (13) hard X-ray (5) ionosphere (4) Langmuir waves (8) Low Frequency Array (LOFAR) (21) microwave emission (15) Murchison Widefield Array (MWA) (10) Nancay Radio Heliograph (NRH) (5) Nobeyama Radioheliograph (NoRH) (8) Parker Solar Probe (PSP) (11) particle acceleration (8) plasma radio emission (6) Quasi-periodic pulsations (QPP) (4) quiet Sun (9) radio spikes (11) radio wave scattering (13) shock wave (8) simulations (4) Solar Dynamics Observatory (SDO) (4) solar energetic particles (SEP) (24) solar flare (29) Solar Orbiter (SolO) (7) solar radio emission (20) space weather (4) STEREO (10) submillimeter emission (4) turbulence (18) Type III solar radio bursts (66) Type II solar radio bursts (38) Type I solar radio bursts (7) Type IV solar radio bursts (11) Ukrainian T-shaped radio telescope (UTR-2) (4) Ultraviolet (UV)/extreme ultraviolet (EUV) emissions (6) Wind (spacecraft) (7) zebra-structure (7)
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  • Connecting energetic electrons at the Sun and in the heliosphere through X-ray and radio diagnostics by D. Paipa-Leon et al.

    2025-06-10

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