Pietro Zucca
A5074918414- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Gamma-ray bursts and supernovae
- Radio Astronomy Observations and Technology
- Astrophysics and Cosmic Phenomena
- Geophysics and Gravity Measurements
- Pulsars and Gravitational Waves Research
- Earthquake Detection and Analysis
- GNSS positioning and interference
- Stellar, planetary, and galactic studies
- Geomagnetism and Paleomagnetism Studies
- earthquake and tectonic studies
- Astronomical Observations and Instrumentation
- Astro and Planetary Science
- Atmospheric Ozone and Climate
- Solar Radiation and Photovoltaics
- Radio Wave Propagation Studies
- Spacecraft Design and Technology
- Space exploration and regulation
- Galaxies: Formation, Evolution, Phenomena
- Seismic Imaging and Inversion Techniques
- Inertial Sensor and Navigation
- Global Energy and Sustainability Research
- Market Dynamics and Volatility
- Seismology and Earthquake Studies
Netherlands Institute for Radio Astronomy
2017-2025
KBR (United States)
2022
Sorbonne Université
2014-2018
Laboratoire d’études spatiales et d’instrumentation en astrophysique
2014-2018
Observatoire de Paris
2016-2018
Centre National de la Recherche Scientifique
2014-2018
Université de Versailles Saint-Quentin-en-Yvelines
2016-2018
Université Paris Cité
2014-2018
Université Paris Sciences et Lettres
2017-2018
Janssen (France)
2016-2017
ABSTRACT We study the link between an expanding coronal shock and energetic particles measured near Earth during ground level enhancement of 2012 May 17. developed a new technique based on multipoint imaging to triangulate three-dimensional (3D) expansion forming in corona. It uses images from three vantage points by mapping outermost extent region perturbed pressure front. derive for first time 3D velocity vector distribution Mach numbers, M FM , entire front as function time. Our approach...
We present an overview of the LOFAR Tied-Array All-Sky Survey (LOTAAS) for radio pulsars and fast transients. The survey uses high-band antennas Superterp, dense inner part core, to northern sky (dec > 0 deg) at a central observing frequency 135 MHz. A total 219 tied-array beams (coherent summation station signals, covering 12 square degrees), as well three incoherent (covering 67 degrees) are formed in each pointing. For ofthe 222 beams, intensity is recorded 491.52 us time resolution. Each...
Super-Alfv\'enic shock waves associated with coronal mass ejections (CMEs) can produce radio emission known as Type II bursts. In the absence of direct imaging, accurate estimates electron densities, magnetic field strengths and Alfv\'en speeds are required in order to calculate kinematics shocks. To date, 1D radial models have been used, but these not appropriate for shocks propagating non-radial directions. Here, we study a wave CME burst using 2D density speed maps determine locations...
The International LOFAR Telescope is an interferometer with stations spread across Europe. With baselines of up to ~2000 km, has the unique capability achieving sub-arcsecond resolution at frequencies below 200 MHz. However, it technically and logistically challenging process data this resolution. To date only a handful publications have exploited capability. Here we present calibration strategy that builds on previous high-resolution work LOFAR. It implemented in pipeline using mostly...
Energetic particles in the heliosphere are produced by flaring processes on Sun or shocks driven coronal mass ejections. These can be detected remotely through electromagnetic radiation they generate (X-rays radio emission) situ spacecraft monitoring and heliosphere. Here, we investigate acceleration location, escape, propagation directions of electron beams producing bursts observed with Low Frequency Array (LOFAR), Parker Solar Probe (PSP) Orbiter (SolO) compare it to hard X-ray (HXR)...
Context. The Sun is an active source of radio emission that often associated with energetic phenomena ranging from nanoflares to coronal mass ejections (CMEs). At low frequencies (<100 MHz), numerous millisecond duration bursts have been reported, such as spikes or solar S (where stands for short). To date, these neither studied extensively nor imaged because the instrumental limitations previous telescopes. Aims. Here, Low Frequency Array (LOFAR) observations were used study spectral and...
High-precision pulsar timing requires accurate corrections for dispersive delays of radio waves, parametrized by the dispersion measure (DM), particularly if these are variable in time. In a previous paper we studied Solar-wind (SW) models used to mitigate excess DM annually induced SW, and found be insufficient high-precision timing. Here analyze additional datasets further investigate which aspects SW currently can readily improved, at what levels precision mitigation is possible. Our...
Collisionless shocks are one of the most powerful particle accelerators in Universe. In heliosphere, type II solar radio bursts signatures electrons accelerated by collisionless launched at Sun. Spectral observations these show a variety fine structures often composing multiple lanes. The origin lanes and is not well understood has been attributed to inhomogeneous environment around propagating shock. Here, we aim determine large-scale local near coronal shock wave using high-resolution...
The Parker Solar Probe (PSP) mission provides a unique opportunity for both remote and in situ measurements of solar activity very close to the Sun. This is an especially powerful approach when studying radio bursts, which can also be observed with modern ground-based interferometers such as Low Frequency Array (LOFAR). We report here combined detection energetic electrons (LOFAR) telescope PSP during its 17th perihelion encounter, on September 24, 2023. LOFAR short but intense period type...
The Sun is an active source of radio emission which often associated with energetic phenomena such as solar flares and coronal mass ejections (CMEs). At low frequencies (<100 MHz), the has not been imaged extensively because instrumental limitations previous telescopes. Here, combined high spatial, spectral temporal resolution Low Frequency Array (LOFAR) was used to study Type III bursts at 30-90 MHz their association CMEs. 126 simultaneous tied-array beams within 5 radii centre. This method...
Cassiopeia A is one of the best-studied supernova remnants. Its shocked ejecta emits brightly in radio and X-rays. unshocked can be studied through infrared emission, radio-active decay $^{44}$Ti, low frequency free-free absorption due to cold gas internal shell. Free-free affected by mass, geometry, temperature, ionisation conditions absorbing gas. Observations at lowest frequencies constrain a combination these properties. We use LOFAR LBA observations 30-77 MHz L-band VLA compare...
Abstract Shock waves in the solar corona are closely associated with coronal mass ejections and flares. The longest-known frequently studied signatures of shock metric type II radio bursts, which provide information on driver ambient plasma conditions. We report outstanding high frequency/time resolution LOw Frequency ARray (LOFAR) observations a burst. LOFAR show strong fragmentation emission, both frequency time domains, during whole duration event. A very unusual splitting an...
Abstract Radio emission of the quiet Sun is considered to be due thermal bremsstrahlung hot solar atmosphere. The properties in microwave band have been well studied, and they can described by spectrum emission. In meter-wave decameter-wave bands, rarely studied instrumental limitations. this work, we use LOw Frequency ARray telescope perform high quality interferometric imaging spectroscopy observations coronal at frequencies below 90 MHz. We present brightness temperature size frequency...
Using multiwavelength imaging observations, in EUV, white light and radio, radio spectral data over a large frequency range, we analyzed the triggering development of complex eruptive event. This one includes two components, an jet coronal mass ejection (CME), which interact during more than 30 minutes, can be considered as physically linked. was unusual The is generated above typical magnetic configuration that has been investigated many former studies related to build-up jets; this...
Type II radio bursts are evidence of shocks in the solar atmosphere and inner heliosphere that emit waves ranging from sub-meter to kilometer lengths. These may be associated with CMEs reach speeds higher than local magnetosonic speed. Radio imaging decameter wavelengths (20-90 MHz) is now possible LOFAR, opening a new window which study coronal leave corona enter interplanetary medium understand their association CMEs. To this end, we shock CME type burst determine locations at emission...
Dispersive delays due to the Solar wind introduce excess noise in high-precision pulsar timing experiments, and must be removed order achieve accuracy needed detect, e.g., low-frequency gravitational waves. In current this delay is usually by approximating electron density distribution either as spherically symmetric, or with a two-phase model that describes contributions from both high- low-speed phases of wind. However, no dataset has previously been available test performance limitations...
This paper presents the results from one of first observations ionospheric scintillation taken using Low-Frequency Array (LOFAR). The observation was strong natural radio source Cassiopeia A, overnight on 18–19 August 2013, and exhibited moderately scattering effects in dynamic spectra intensity received across an observing bandwidth 10–80 MHz. Delay-Doppler (the 2-D FFT spectrum) hour showed two discrete parabolic arcs, with a steep curvature other shallow, which can be used to provide...
The four persistent radio sources in the northern sky with highest flux density at metre wavelengths are Cassiopeia A, Cygnus Taurus and Virgo A; collectively they called A-team. Their densities ultra-low frequencies (<100 MHz) can reach several thousands of janskys, often contaminate observations low-frequency by interfering image processing. Furthermore, these foreground objects for all-sky hampering study faint signals, such as cosmological 21 cm line from epoch reionisation. We aim to...
The Low-Frequency Array (LOFAR) Long-Baseline Calibrator Survey (LBCS) was conducted between 2014 and 2019 in order to obtain a set of suitable calibrators for the LOFAR array. In this paper we present complete survey, building on preliminary analysis published 2016 which covered approximately half survey area. final catalogue consists 30006 observations 24713 sources northern sky, selected combination high low-frequency radio flux density flat spectral index using existing surveys (WENSS,...
Context. Solar Orbiter, launched in February 2020, started its cruise phase June coincidence with first perihelion at 0.51 au from the Sun. The situ instruments onboard, including Energetic Particle Detector (EPD), operate continuously during enabling observation of solar energetic particles. Aims. In measurements near-relativistic electron events observed July 2020 by EPD are analyzed and origins conditions for interplanetary transport these particles investigated. Methods. Electron...
Observations made using the LOw-Frequency ARray (LOFAR) between 10:15 and 11:48 UT on 15th of September 2018 over a bandwidth approximately 25–65 MHz contain discrete pseudo-periodic features ionospheric origin. These occur within period 10 min collectively last roughly an hour. They are strongly frequency dependent, broadening significantly in time towards lower frequencies, show overlaid pattern diffraction fringes. By modelling ionosphere as thin phase screen containing wave-like...
The Sun produces highly dynamic and eruptive events that can drive shocks through the corona. These accelerate electrons, which result in plasma emission form of a type II radio burst. Despite large number bursts observations, precise origin coronal is still subject to investigation. Here we present well observed solar event occurred on 16 October 2015, focusing jet extreme ultraviolet (EUV) by Atmospheric Imaging Assembly (SDO/AIA), streamer white-light Large Angle Spectrometric Coronagraph...