H. E. Mason
YOU?
Author Swipe
View article: Nigel R. Badnell (1958–2024): A Legacy in Atomic Astrophysics
Nigel R. Badnell (1958–2024): A Legacy in Atomic Astrophysics Open
Nigel Robert Badnell was born on the 27th of October 1958 and grew up in Swindon where he lived with his parents, Dave and Patricia, and his wee sister, Hilary [...]
View article: Determining the Nanoflare Heating Frequency of an X-Ray Bright Point Observed by MaGIXS
Determining the Nanoflare Heating Frequency of an X-Ray Bright Point Observed by MaGIXS Open
Nanoflares are thought to be one of the prime candidates that can heat the solar corona to its multimillion kelvin temperature. Individual nanoflares are difficult to detect with the present generation of instruments, but their presence ca…
View article: SPICE connection mosaics to link the Sun’s surface and the heliosphere
SPICE connection mosaics to link the Sun’s surface and the heliosphere Open
Aims. We present an analysis of the first connection mosaic made by the SPICE instrument on board the ESA/NASA Solar Orbiter mission on March 2, 2022. The data will be used to map coronal composition that will be compared with in-situ meas…
View article: Determining the nanoflare heating frequency of an X-ray Bright Point observed by MaGIXS
Determining the nanoflare heating frequency of an X-ray Bright Point observed by MaGIXS Open
Nanoflares are thought to be one of the prime candidates that can heat the solar corona to its multi-million kelvin temperature. Individual nanoflares are difficult to detect with the present generation instruments, however their presence …
View article: Multiwavelength Observations of a B-class Flare Using XSM, AIA, and XRT
Multiwavelength Observations of a B-class Flare Using XSM, AIA, and XRT Open
We present multiwavelength observations by Chandrayaan-2/Solar X-ray Monitor, Solar Dynamics Observatory/Atmospheric Imaging Assembly, and Hinode/X-Ray Telescope (XRT) of a B-class flare observed on 2021 February 25, originating from an ac…
View article: Evolution of Elemental Abundances in Hot Active Region Cores from Chandrayaan-2 XSM Observations
Evolution of Elemental Abundances in Hot Active Region Cores from Chandrayaan-2 XSM Observations Open
The first ionization potential (FIP) bias, whereby elemental abundances for low-FIP elements in different coronal structures vary from their photospheric values and may also vary with time, has been widely studied. In order to study the te…
View article: Multi-wavelength observations of a B-class flare using XSM, AIA, and XRT
Multi-wavelength observations of a B-class flare using XSM, AIA, and XRT Open
We present multi-wavelength observations by Chandrayaan-2/XSM, SDO/AIA and Hinode/XRT of a B-class flare observed on 25th February, 2021, originating from an active region (AR 12804) near the North-West limb. The microflare lasts for appro…
View article: SPICE Connection Mosaics to link the Sun's surface and the heliosphere
SPICE Connection Mosaics to link the Sun's surface and the heliosphere Open
We present an analysis of the first connection mosaic made by the SPICE instrument on board of the ESA / NASA Solar Orbiter mission on March 2nd, 2022. The data will be used to map coronal composition that will be compared with in-situ mea…
View article: A benchmark study of atomic models for the transition region against quiet Sun observations
A benchmark study of atomic models for the transition region against quiet Sun observations Open
The use of the coronal approximation to model line emission from the solar transition region has led to discrepancies with observations over many years, particularly for Li- and Na-like ions. Studies have shown that a number of atomic proc…
View article: A benchmark study of atomic models for the transition region against quiet Sun observations
A benchmark study of atomic models for the transition region against quiet Sun observations Open
The use of the coronal approximation to model line emission from the solar transition region has led to discrepancies with observations over many years, particularly for Li- and Na-like ions. Studies have shown that a number of atomic proc…
View article: The First Flight of the Marshall Grazing Incidence X-Ray Spectrometer (MaGIXS)
The First Flight of the Marshall Grazing Incidence X-Ray Spectrometer (MaGIXS) Open
The Marshall Grazing Incidence X-ray Spectrometer (MaGIXS) sounding rocket experiment launched on 2021 July 30 from the White Sands Missile Range in New Mexico. MaGIXS is a unique solar observing telescope developed to capture X-ray spectr…
View article: Role of Small-scale Impulsive Events in Heating the X-Ray Bright Points of the Quiet Sun
Role of Small-scale Impulsive Events in Heating the X-Ray Bright Points of the Quiet Sun Open
Small-scale impulsive events, known as nanoflares, are thought to be one of the prime candidates that can keep the solar corona hot at its multimillion-Kelvin temperature. Individual nanoflares are difficult to detect with the current gene…
View article: Coronal Densities, Temperatures, and Abundances during the 2019 Total Solar Eclipse: The Role of Multiwavelength Observations in Coronal Plasma Characterization
Coronal Densities, Temperatures, and Abundances during the 2019 Total Solar Eclipse: The Role of Multiwavelength Observations in Coronal Plasma Characterization Open
The Airborne Infrared Spectrometer (AIR-Spec) offers an unprecedented opportunity to explore the near-infrared (NIR) wavelength range. It has been flown at two total solar eclipses, in 2017 and 2019. The wavelength range of the much-improv…
View article: Evolution of elemental abundances in hot active region cores from Chandrayaan-2 XSM observations
Evolution of elemental abundances in hot active region cores from Chandrayaan-2 XSM observations Open
The First Ionization Potential (FIP) bias, whereby elemental abundances for low FIP elements in different coronal structures vary from their photospheric values and may also vary with time, has been widely studied. In order to study the te…
View article: Role of small-scale impulsive events in heating the X-ray bright points of the quiet Sun
Role of small-scale impulsive events in heating the X-ray bright points of the quiet Sun Open
Small-scale impulsive events, known as nanoflares, are thought to be one of the prime candidates that can keep the solar corona hot at its multi-million Kelvin temperature. Individual nanoflares are difficult to detect with the current gen…
View article: The First Flight of the Marshall Grazing Incidence X-ray Spectrometer (MaGIXS)
The First Flight of the Marshall Grazing Incidence X-ray Spectrometer (MaGIXS) Open
The Marshall Grazing Incidence X-ray Spectrometer (MaGIXS) sounding rocket experiment launched on July 30, 2021 from the White Sands Missile Range in New Mexico. MaGIXS is a unique solar observing telescope developed to capture X-ray spect…
View article: Formation and Thermodynamic Evolution of plasmoids in active region jets
Formation and Thermodynamic Evolution of plasmoids in active region jets Open
We have carried out a comprehensive study of the temperature structure of plasmoids, which successively occurred in recurrent active region jets. The multithermal plasmoids were seen to be travelling along the multi-threaded spire as well …
View article: Formation and thermodynamic evolution of plasmoids in active region jets
Formation and thermodynamic evolution of plasmoids in active region jets Open
We have carried out a comprehensive study of the temperature structure of plasmoids, which successively occurred in recurrent active region jets. The multithermal plasmoids were seen to be travelling along the multithreaded spire as well a…
View article: Soft X-Ray Spectral Diagnostics of Multithermal Plasma in Solar Flares with Chandrayaan-2 XSM
Soft X-Ray Spectral Diagnostics of Multithermal Plasma in Solar Flares with Chandrayaan-2 XSM Open
Spectroscopic observations in X-ray wavelengths provide excellent diagnostics of the temperature distribution in solar flare plasma. The Solar X-ray Monitor (XSM) on board the Chandrayaan-2 mission provides broadband disk-integrated soft X…
View article: Soft X-ray Spectral Diagnostics of Multi-thermal Plasma in Solar Flares with Chandrayaan-2 XSM
Soft X-ray Spectral Diagnostics of Multi-thermal Plasma in Solar Flares with Chandrayaan-2 XSM Open
Spectroscopic observations in X-ray wavelengths provide excellent diagnostics of the temperature distribution in solar flare plasma. The Solar X-ray Monitor (XSM) onboard the Chandrayaan-2 mission provides broad-band disk integrated soft X…
View article: Multiwavelength Observations by XSM, Hinode, and SDO of an Active Region. Chemical Abundances and Temperatures
Multiwavelength Observations by XSM, Hinode, and SDO of an Active Region. Chemical Abundances and Temperatures Open
We have reviewed the first year of observations of the Solar X-ray Monitor (XSM) on board Chandrayaan-2 and the available multiwavelength observations to complement the XSM data, focusing on the Solar Dynamics Observatory AIA and Hinode XR…
View article: Multi-wavelength observations by XSM, Hinode and SDO of an active region. Chemical abundances and temperatures
Multi-wavelength observations by XSM, Hinode and SDO of an active region. Chemical abundances and temperatures Open
We have reviewed the first year of observations of the Solar X-ray Monitor (XSM) onboard Chandrayaan-2, and the available multi-wavelength observations to complement the XSM data, focusing on Solar Dynamics Observatory AIA and Hinode XRT, …
View article: Diagnostics of Non-Maxwellian Electron Distributions in Solar Active Regions from Fe xii Lines Observed by the Hinode Extreme Ultraviolet Imaging Spectrometer and Interface Region Imaging Spectrograph
Diagnostics of Non-Maxwellian Electron Distributions in Solar Active Regions from Fe xii Lines Observed by the Hinode Extreme Ultraviolet Imaging Spectrometer and Interface Region Imaging Spectrograph Open
We present joint Hinode Extreme Ultraviolet Imaging Spectrometer (EIS) and Interface Region Imaging Spectrograph (IRIS) observations of Fe xii lines in active regions, both on-disk and off-limb. We use an improved calibration for the EIS d…
View article: The center-to-limb variation of non-thermal velocities using IRIS Si IV
The center-to-limb variation of non-thermal velocities using IRIS Si IV Open
We study the non-thermal velocities in the quiet-sun using various high spatial, temporal, and spectral resolution observations from the Interface Region Imaging Spectrograph (IRIS). We focus our analysis on the transition region using the…
View article: Evolution of Elemental Abundances during B-Class Solar Flares: Soft X-Ray Spectral Measurements with Chandrayaan-2 XSM
Evolution of Elemental Abundances during B-Class Solar Flares: Soft X-Ray Spectral Measurements with Chandrayaan-2 XSM Open
The Solar X-ray Monitor (XSM) payload on board Chandrayaan-2 provides disk-integrated solar spectra in the 1–15 keV energy range with an energy resolution of 180 eV (at 5.9 keV) and a cadence of 1 s. During the period from 2019 September t…
View article: High Resolution Soft X-ray Spectroscopy and the Quest for the Hot (5–10 MK) Plasma in Solar Active Regions
High Resolution Soft X-ray Spectroscopy and the Quest for the Hot (5–10 MK) Plasma in Solar Active Regions Open
We discuss the diagnostics available to study the 5–10 MK plasma in the solar corona, which is key to understanding the heating in the cores of solar active regions. We present several simulated spectra, and show that excellent diagnostics…
View article: Thermodynamic evolution of a sigmoidal active region with associated flares
Thermodynamic evolution of a sigmoidal active region with associated flares Open
Active regions often show S-shaped structures in the corona called sigmoids. These are highly sheared and twisted loops formed along the polarity inversion line. They are considered to be one of the best pre-eruption signatures for CMEs. H…
View article: High Resolution Soft X-ray Spectroscopy and the Quest for the Hot (5–10 MK) Plasma in Solar Active Regions
High Resolution Soft X-ray Spectroscopy and the Quest for the Hot (5–10 MK) Plasma in Solar Active Regions Open
We discuss the diagnostics available to study the 5–10 MK plasma in the solar corona, which is key to understanding the heating in the cores of solar active regions. We present several simulated spectra, and show that excellent diagnostics…
View article: Study of the spatial association between an active region jet and a nonthermal type~${\rm III}$ radio burst
Study of the spatial association between an active region jet and a nonthermal type~${\rm III}$ radio burst Open
We aim to investigate the spatial location of the source of an active region (AR) jet and its relation with associated nonthermal type~III radio emission. An emission measure (EM) method was used to study the thermodynamic nature of the AR…