A5018113160- Solar and Space Plasma Dynamics
- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Ionosphere and magnetosphere dynamics
- Geophysics and Gravity Measurements
- Geomagnetism and Paleomagnetism Studies
- Atmospheric Ozone and Climate
- Gamma-ray bursts and supernovae
- Solar Radiation and Photovoltaics
- History and Developments in Astronomy
- Spacecraft Design and Technology
- American Constitutional Law and Politics
- solar cell performance optimization
- Space exploration and regulation
- Spacecraft and Cryogenic Technologies
- Earthquake Detection and Analysis
- Astronomy and Astrophysical Research
- Dark Matter and Cosmic Phenomena
- Calibration and Measurement Techniques
- Disaster Response and Management
- Astrophysical Phenomena and Observations
- Particle Detector Development and Performance
- GNSS positioning and interference
- Planetary Science and Exploration
- Astrophysics and Cosmic Phenomena
Rutherford Appleton Laboratory
2015-2024
Mars Space (United Kingdom)
2020
University of Cambridge
2017-2019
Science and Technology Facilities Council
2010-2016
Tel Aviv University
2015
Research Complex at Harwell
2011-2014
Liverpool John Moores University
2013
Jacksonville University
2010
United States Merchant Marine Academy
2008
Smith Family
2008
The Sun Earth Connection Coronal and Heliospheric Investigation (SECCHI) is a five telescope package, which has been developed for the Solar Terrestrial Relation Observatory (STEREO) mission by Naval Research Laboratory (USA), Lockheed Astrophysics Goddard Space Flight Center University of Birmingham (UK), Rutherford Appleton Max Planck Institute System (Germany), Centre Spatiale de Leige (Belgium), Institut d'Optique (France) d'Astrophysique (France). SECCHI comprises telescopes, together...
We study the interaction of two successive coronal mass ejections (CMEs) during 2010 August 1 events using STEREO/SECCHI COR and HI data. obtain direction motion for both CMEs by applying several independent reconstruction methods find that head in similar directions. This provides evidence a full takes place between can be observed HI1 field-of-view. The de-projected kinematics faster CME from Sun to Earth is derived combining remote observations with situ measurements at AU. speed profile...
Since the advent of wide-angle imaging inner heliosphere, a plethora techniques have been developed to investigate three-dimensional structure and kinematics solar wind transients, such as coronal mass ejections, from their signatures in single- multi-spacecraft observations. These techniques, which range highly complex computationally intensive methods based on simple curve fitting, all inherent advantages limitations. In analysis single-spacecraft observations, much use has made fixed ϕ...
Forecasting the in situ properties of coronal mass ejections (CMEs) from remote images is expected to strongly enhance predictions space weather, and general interest for studying interaction CMEs with planetary environments. We study feasibility using a single heliospheric imager (HI) instrument, imaging solar wind density Sun 1 AU, connecting observations CMEs. compare speed arrival time 22 (in 2008-2012) corresponding interplanetary ejection (ICME) parameters at observatories (STEREO...
Long-duration Gamma-Ray Bursts (GRBs) are an extremely rare outcome of the collapse massive stars, and typically found in distant Universe. Because its intrinsic luminosity ($L\sim 3 \times 10^{53}$ erg s$^{-1}$) relative proximity ($z=0.34$), GRB 130427A was a unique event that reached highest fluence observed gamma-ray band. Here we present comprehensive multiwavelength view with Swift, 2-m Liverpool Faulkes telescopes by other ground-based facilities, highlighting evolution burst emission...
The successive coronal mass ejections (CMEs) from 2010 July 30 - August 1 present us the first opportunity to study CME-CME interactions with unprecedented heliospheric imaging and in situ observations multiple vantage points. We describe two cases of CME interactions: merging CMEs launched close time overtaking a preceding by shock wave. on interact Sun form merged front, which then overtakes near AU, as revealed wide-angle observations. Connections between signatures at AU suggest that...
Abstract Severe space weather was identified as a risk to the UK in 2010 part of wider review natural hazards triggered by societal disruption caused eruption Eyjafjallajökull volcano April that year. To support further assessment government officials, and at their request, we developed set reasonable worst‐case scenarios first published them technical report 2012 (current version 2020). Each scenario focused on environment could disrupt particular national infrastructure such electric power...
Abstract We report the result of first search for multipoint in situ and imaging observations interplanetary coronal mass ejections (ICMEs) starting with Solar Orbiter (SolO) data 2020 April–2021 April. A exploration analysis is performed including visualizations magnetic-field plasma made by five spacecraft SolO, BepiColombo, Parker Probe (PSP), Wind, STEREO-A, connection coronagraph heliospheric from STEREO-A/SECCHI SOHO/LASCO. identify ICME events that could be unambiguously followed...
Abstract Coronal mass ejections (CMEs) can create significant disruption to human activities and systems on Earth, much of which be mitigated with prior warning the upstream solar wind conditions. However, it is currently extremely challenging accurately predict arrival time internal structure a CME from coronagraph images alone. In this study, we take advantage rare opportunity use Solar Orbiter, at 0.5 au as an monitor. combination low‐latency STEREO‐A, successfully predicted two events...
During relatively quiet solar conditions throughout the spring and summer of 2007, SECCHI HI2 white-light telescope on STEREO B solar-orbiting spacecraft observed a succession wave fronts sweeping past Earth. We have compared these heliospheric images with in situ plasma magnetic field measurements obtained by near-Earth spacecraft, we found near perfect association between occurrence waves arrival density enhancements at leading edges high-speed wind streams. Virtually all strong corotating...
A set of five observations extreme-ultraviolet (EUV) coronal dimming associated with mass ejection (CME) activity is examined. Using spectroscopic data, plasma characteristics across a broad range temperatures from 20 000 K to 2 million are determined. The events found coincide in time, and spatially, the projected onset times locations CMEs. spectral data confirm that due mass-loss, not temperature variations. actual mass-loss calculated degree dimming, using two different methods, shows...
We present stereoscopic images of an Earth‐impacting Coronal Mass Ejection (CME). The CME was imaged by the Heliospheric Imagers onboard twin STEREO spacecraft during December 2008. apparent acceleration is used to provide independent estimates its speed and direction from two spacecraft. Three distinct signatures within were all found be closely Earth‐directed. At time that predicted pass ACE spacecraft, in‐situ observations contained a typical signature. Earth, ground‐based magnetometer...
The Heliospheric Imager (HI) instruments on board the STEREO spacecraft are used to analyze solar wind during August and September 2007. We show how HI can be image streamer belt and, in particular, variability of slow which originates inside vicinity belt. Intermittent mass flows observed difference images, streaming out along extension helmet streamers. These appear very differently images: plasma distributed twisted flux ropes, V‐shaped structures, or “blobs.” variety these transient...
The images taken by the Heliospheric Imagers (HIs), part of SECCHI imaging package onboard pair STEREO spacecraft, provide information on radial and latitudinal evolution plasma compressed inside corotating interaction regions (CIRs). A density wave imaged HI instrument STEREO-B was found to propagate towards STEREO-A, enabling a comparison between simultaneous remote-sensing in situ observations its structure be performed. In measurements made STEREO-A show that is associated with passage...
The twin-spacecraft STEREO mission has enabled simultaneous white-light imaging of the solar corona and inner heliosphere from multiple vantage points. This led to development numerous stereoscopic techniques investigate three-dimensional structure kinematics wind transients such as coronal mass ejections (CMEs). Two methods—triangulation tangent a sphere—can be used determine time profiles propagation direction radial distance (and thereby speed) transient it travels through heliosphere,...
On 2010 August 1, the northern solar hemisphere underwent significant activity that involved a complex set of active regions near central meridian with, nearby, two large prominences and other more distant regions. This culminated in eruption four major coronal mass ejections (CMEs), effects which were detected at Earth system bodies. Recognizing unprecedented wealth data from wide range spacecraft available—providing potential for us to explore methods CME identification tracking, assess...
We present an advance towards accurately predicting the arrivals of coronal mass ejections (CMEs) at terrestrial planets, including Earth. For first time, we are able to assess a CME prediction model using data over 2/3 solar cycle observations with Heliophysics System Observatory. validate modeling results 1337 CMEs observed Solar Terrestrial Relations Observatory (STEREO) heliospheric imagers (HI) (science data) from 8 years by 5 in situ observing spacecraft. use self-similar expansion for...
In this study, we present a new method for forecasting arrival times and speeds of coronal mass ejections (CMEs) at any location in the inner heliosphere. This approach enables adoption highly flexible geometrical shape CME front with an adjustable angular width radius curvature its leading edge, i.e., assumed geometry is elliptical. Using, as input, Solar TErrestrial RElations Observatory (STEREO) heliospheric imager (HI) observations, elliptic conversion (ElCon) introduced combined use...
Aims . We present the design and pre-launch performance of Solar Orbiter Heliospheric Imager (SoloHI) which is an instrument prepared for inclusion in ESA/NASA mission, currently scheduled launch 2020. Methods The goal this paper to provide details SoloHI concept, design, pre-flight give potential user data a better understanding how observations are collected sources that contribute signal. Results discusses science objectives, including SoloHI-specific aspects, before presenting concepts,...