Grégory Hellbourg
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View article: Enigmatic Centi-SFU and mSFU Nonthermal Radio Transients Detected in the Middle Corona
Enigmatic Centi-SFU and mSFU Nonthermal Radio Transients Detected in the Middle Corona Open
Decades of solar coronal observations have provided substantial evidence for accelerated particles in the corona. In most cases, the location of particle acceleration can be roughly identified by combining high spatial and temporal resolut…
View article: A Dedicated System for Coordinated Radio and Optical Monitoring of the Space Weather of Young, Solar-type Stars
A Dedicated System for Coordinated Radio and Optical Monitoring of the Space Weather of Young, Solar-type Stars Open
Low-frequency radio emission in the form of type II and III bursts is a direct indicator of plasma motion in the solar corona and interplanetary medium. However, detecting equivalent events on solar analogs requires thousands of observing …
View article: Possible First Detection of Gyroresonance Emission from a Coronal Mass Ejection in the Middle Corona
Possible First Detection of Gyroresonance Emission from a Coronal Mass Ejection in the Middle Corona Open
Routine measurements of the magnetic field of coronal mass ejections (CMEs) have been a key challenge in solar physics. Making such measurements is important both from a space weather perspective and for understanding the detailed evolutio…
View article: Probing the Turbulent Corona and Heliosphere Using Radio Spectral Imaging Observation during the Solar Conjunction of the Crab Nebula
Probing the Turbulent Corona and Heliosphere Using Radio Spectral Imaging Observation during the Solar Conjunction of the Crab Nebula Open
Measuring plasma parameters in the upper solar corona and inner heliosphere is challenging because of the region’s weakly emissive nature and inaccessibility for most in situ observations. Radio imaging of broadened and distorted backgroun…
High energy cosmic ray detections with the standalone radio trigger system at the Owens Valley Radio Observatory Long Wavelength Array Open
Radio observations of cosmic ray air showers can characterize cosmic ray mass composition, via precise Xmax measurements, at the energies of the likely shift from Galactic to extragalactic sources. Advantages over other methods include low…
View article: Measuring the Magnetic Field of a Coronal Mass Ejection from the Low to Middle Corona
Measuring the Magnetic Field of a Coronal Mass Ejection from the Low to Middle Corona Open
A major challenge in understanding the initiation and evolution of coronal mass ejections (CMEs) is measuring the magnetic field of the magnetic flux ropes (MFRs) that drive CMEs. Recent developments in radio imaging spectroscopy have pave…
View article: Sensing and Stopping Interfering Secondary Users: Validation of an Efficient Spectrum Sharing System
Sensing and Stopping Interfering Secondary Users: Validation of an Efficient Spectrum Sharing System Open
We present the design and validation of Stoppable Secondary Use (StopSec), a privacy-preserving protocol with the capability to identify a secondary user (SU) causing interference to a primary user (PU) and to act quickly to stop the inter…
View article: Probing the Turbulent Corona and Heliosphere Using Radio Spectral Imaging Observation during the Solar Conjunction of Crab Nebula
Probing the Turbulent Corona and Heliosphere Using Radio Spectral Imaging Observation during the Solar Conjunction of Crab Nebula Open
Measuring plasma parameters in the upper solar corona and inner heliosphere is challenging because of the region's weakly emissive nature and inaccessibility for most in situ observations. Radio imaging of broadened and distorted backgroun…
View article: Implementing Continuous All-sky Monitoring with the OVRO-LWA to Identify Prompt and Precursor Counterparts of Gravitational Wave Events
Implementing Continuous All-sky Monitoring with the OVRO-LWA to Identify Prompt and Precursor Counterparts of Gravitational Wave Events Open
A number of theoretical studies have proposed a prompt or precursor low-frequency radio counterpart to gravitational wave events detected by LIGO and Virgo. Detection of such events would offer a new window on the immediate environment of …
View article: Deep Synoptic Array Science: A 50 Mpc Fast Radio Burst Constrains the Mass of the Milky Way Circumgalactic Medium
Deep Synoptic Array Science: A 50 Mpc Fast Radio Burst Constrains the Mass of the Milky Way Circumgalactic Medium Open
We present the Deep Synoptic Array (DSA-110) discovery and interferometric localization of the so far nonrepeating FRB 20220319D. The FRB originates in a young, rapidly star-forming barred spiral galaxy, IRAS 02044+7048, at just 50 Mpc. Al…
View article: Survey and monitoring of ASKAP’s RFI environment and trends I: Flagging statistics
Survey and monitoring of ASKAP’s RFI environment and trends I: Flagging statistics Open
We present an initial analysis of Radio Frequency Interference (RFI) flagging statistics from archived Australian SKA Pathfinder (ASKAP) observations for the ‘Survey and Monitoring of ASKAP’s RFI environment and Trends’ (SMART) project. SM…
View article: Cellular Wireless Networks in the Upper Mid-Band
Cellular Wireless Networks in the Upper Mid-Band Open
The upper mid-band - approximately from 7 to 24 GHz - has recently attracted considerable interest for new cellular services. This frequency range has vastly more spectrum than the highly congested bands below 7 GHz while offering more fav…
View article: Survey and Monitoring of ASKAP's RFI Environment and Trends I: Flagging Statistics
Survey and Monitoring of ASKAP's RFI Environment and Trends I: Flagging Statistics Open
We present an initial analysis of Radio Frequency Interference (RFI) flagging statistics from archived Australian SKA Pathfinder (ASKAP) observations for the 'Survey and Monitoring of ASKAP's RFI environment and Trends' (SMART) project. Th…
View article: Cellular Wireless Networks in the Upper Mid-Band
Cellular Wireless Networks in the Upper Mid-Band Open
The upper mid-band - roughly from 7 to 24 GHz - has attracted considerable recent interest for new cellular services. This frequency range has vastly more spectrum than the highly congested bands below 7 GHz while offering more favorable p…
View article: Deep Synoptic Array Science: First FRB and Host Galaxy Catalog
Deep Synoptic Array Science: First FRB and Host Galaxy Catalog Open
Fast Radio Bursts (FRBs) are a powerful and mysterious new class of transient that are luminous enough to be detected at cosmological distances. By associating FRBs to host galaxies, we can measure intrinsic and environmental properties th…
View article: Collaboration with Cellular Networks for RFI Cancellation at Radio Telescope
Collaboration with Cellular Networks for RFI Cancellation at Radio Telescope Open
The growing need for electromagnetic spectrum to support the next generation (xG) communication networks increasingly generate unwanted radio frequency interference (RFI) in protected bands for radio astronomy. RFI is commonly mitigated at…
View article: Machine Learning in Heliophysics and Space Weather Forecasting: A White Paper of Findings and Recommendations
Machine Learning in Heliophysics and Space Weather Forecasting: A White Paper of Findings and Recommendations Open
The authors of this white paper met on 16-17 January 2020 at the New Jersey Institute of Technology, Newark, NJ, for a 2-day workshop that brought together a group of heliophysicists, data providers, expert modelers, and computer/data scie…
Performance analysis of the Karhunen-Loève Transform for artificial and astrophysical transmissions: denoising and detection Open
In this work, we propose a new method of computing the Karhunen-Loève Transform (KLT) applied to complex voltage data for the detection and noise level reduction in astronomical signals. We compared this method with the standard KLT techni…
View article: The Breakthrough Listen Search for Extraterrestrial Intelligence
The Breakthrough Listen Search for Extraterrestrial Intelligence Open
The discovery of the ubiquity of habitable extrasolar planets, combined with revolutionary advances in instrumentation and observational capabilities, have ushered in a renaissance in the millenia-old quest to answer our most profound ques…
View article: A fast radio burst with frequency-dependent polarization detected during Breakthrough Listen observations
A fast radio burst with frequency-dependent polarization detected during Breakthrough Listen observations Open
Here, we report on the detection and verification of fast radio burst FRB 180301, which occurred on utc 2018 March 1 during the Breakthrough Listen observations with the Parkes telescope. Full-polarization voltage data of the detection wer…
Comparison of signal detectors for time domain radio SETI Open
The radio Search for Extra Terrestrial Intelligence (SETI) aims at identifying intelligent and communicative civilizations in the Universe through the detection of engineered transmissions. In the absence of prior knowledge concerning the …
RFI subspace smearing and projection for array radio telescopes Open
Active Radio Frequency Interference (RFI) mitigation becomes a necessity for radio astronomy. The solution commonly applied by the community consists in monitoring the statistics of the received signal, and flag out the detected corrupted …
View article: Highest Frequency Detection of FRB 121102 at 4–8 GHz Using the Breakthrough Listen Digital Backend at the Green Bank Telescope
Highest Frequency Detection of FRB 121102 at 4–8 GHz Using the Breakthrough Listen Digital Backend at the Green Bank Telescope Open
We report the first detections of the repeating fast radio burst source FRB 121102 above 5.2 GHz. Observations were performed using the 4–8 GHz receiver of the Robert C. Byrd Green Bank Telescope with the Breakthrough Listen digital backen…
Seti Detection Strategies for Single Dish Radio Telescopes Open
Radio Searches for Extra Terrestrial Intelligence aim at detecting artificial\ntransmissions from extra terrestrial communicative civilizations. The lack of\nprior knowledge concerning these potential transmissions increase the search\npar…
Breakthrough Listen Observations of 1I/'Oumuamua with the GBT Open
We have conducted a search for radio emission consistent with an artificial source targeting 1I/'Oumuamua with the Robert C. Byrd Green Bank Telescope (GBT) between 1.1 and 11.6 GHz. We searched the data for narrowband signals and found no…