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RESIK and RHESSI observations of the 20 September 2002 flare
Siarkowski, M.; Falewicz, R.; Kepa, A. +1 more
Context. Soft X-ray spectra (3.33 Å-6.15 Å) from the RESIK instrument on CORONAS-F constitute a unique database for the study of the physical conditions of solar flare plasmas, enabling the calculation of differential emission measures. The two RESIK channels for the shortest wavelengths overlap with the lower end of the Ramaty High Energy Solar S…
Opening pupils' eyes to the Sun
Baker, Deborah; Matthews, Sarah; Dunn, William +7 more
Ryan French and colleagues discuss their Hinode/EIS outreach work and the resulting resources available for A-level classes
Magnetic Rayleigh-Taylor instability at a contact discontinuity with an oblique magnetic field
Erdélyi, R.; Ballai, I.; Vickers, E.
Aims: We investigate the nature of the magnetic Rayleigh-Taylor instability at a density interface that is permeated by an oblique homogeneous magnetic field in an incompressible limit.
Methods: Using the system of linearised ideal incompressible magnetohydrodynamics equations, we derive the dispersion relation for perturbations of the c…
High-Spatiotemporal Resolution Observations of Jupiter Lightning-Induced Radio Pulses Associated With Sferics and Thunderstorms
Wong, Michael H.; Bolton, Scott J.; Levin, Steven M. +6 more
Jupiter lightning discharges produce various kinds of phenomena including radio wave pulses at different frequencies. On 6 April 2019, the Juno Waves instrument captured an extraordinary series of radio pulses at frequencies below 150 kHz on timescales of submilliseconds. Quasi-simultaneous multi-instrument data show that the locations of their ma…
Atomic data and uncertainties with PyAtomDB
Foster, Adam R.
The Atomic Database project (AtomDB) atomic database provides access to a curated collection of atomic data, along with tools that convert this data into emissivities used in many analysis tools. We present the outline of some of the tools now available for accessing AtomDB using the new Python interface, developed to handle the larger datasets th…
Global-scale brittle plastic rheology at the cometesimals merging of comet 67P/Churyumov-Gerasimenko
Naletto, Giampiero; Francheschi, M.; Penasa, Luca +12 more
Local Least Squares Analysis of Auroral Currents
He, Maosheng; Vogt, Joachim; Bunescu, Costel +1 more
Multi-spacecraft probing of geospace allows the study of physical structures on spatial scales dictated by orbital and instrumental parameters. This chapter highlights multi-point array analysis methods for constellations of two or three spacecraft such as Swarm, and also discusses multi-scale techniques for the geometrical characterisation of aur…
Source region identification and geophysical effects of stealth coronal mass ejections
Fainshtein, V. G.; Zagainova, Iu. S.; Gromova, L. I. +1 more
We use the example of two Stealth-type coronal mass ejections (stealth CMEs) registered by LASCO C2 on the quiescent Sun on 16 June 2010 and in the active region NOAA 11520 7 July 2012 to demonstrate that these mass ejections emerged in a lower-coronal area where an intense short-term radiation burst was registered in several extreme ultraviolet c…
The Relaxation of Reconnected Open Magnetic Field Lines in the Earth's Magnetosphere
Xu, Qi; Xu, Xiaojun; Wang, Jing +3 more
Magnetic reconnection is a fundamental and important physical process that can release magnetic energy and change magnetic topology. A statistic study of reconnected magnetic field lines has been carried out by Cluster spacecraft 1 during 58 current sheet crossing events. We calculated the values of $| {B}_{n}/B| $ at different distances from reco…
Physical and Chemical Properties of Galactic Global Clusters with Various Origins Identified from the Gaia DR2 Data
Marsakov, V. A.; Koval', V. V.; Gozha, M. L.
The differences in the relationships between the physical parameters and the chemical-element abundances in accreted globular star clusters and those formed inside the Galaxy have been investigated. The information on the supposed formation sites of the clusters based on the Gaia DR2 data is borrowed from the literature. Those sources estimate the…