Search Publications
Modelling Quasi-Periodic Pulsations in Solar and Stellar Flares
Nakariakov, V. M.; Jelínek, P.; McLaughlin, J. A. +2 more
Solar flare emission is detected in all EM bands and variations in flux density of solar energetic particles. Often the EM radiation generated in solar and stellar flares shows a pronounced oscillatory pattern, with characteristic periods ranging from a fraction of a second to several minutes. These oscillations are referred to as quasi-periodic p…
The Atmospheric Chemistry Suite (ACS) of Three Spectrometers for the ExoMars 2016 Trace Gas Orbiter
Zelenyi, L. M.; Lopez-Valverde, M. A.; Patel, M. R. +71 more
The Atmospheric Chemistry Suite (ACS) package is an element of the Russian contribution to the ESA-Roscosmos ExoMars 2016 Trace Gas Orbiter (TGO) mission. ACS consists of three separate infrared spectrometers, sharing common mechanical, electrical, and thermal interfaces. This ensemble of spectrometers has been designed and developed in response t…
Jets Downstream of Collisionless Shocks
Kajdič, Primož; Blanco-Cano, Xóchitl; Karlsson, Tomas +10 more
The magnetosheath flow may take the form of large amplitude, yet spatially localized, transient increases in dynamic pressure, known as "magnetosheath jets" or "plasmoids" among other denominations. Here, we describe the present state of knowledge with respect to such jets, which are a very common phenomenon downstream of the quasi-parallel bow sh…
Solar Ultraviolet Bursts
Chitta, L. P.; Heinzel, Petr; Toriumi, Shin +16 more
The term "ultraviolet (UV) burst" is introduced to describe small, intense, transient brightenings in ultraviolet images of solar active regions. We inventorize their properties and provide a definition based on image sequences in transition-region lines. Coronal signatures are rare, and most bursts are associated with small-scale, canceling oppos…
Clouds and Hazes of Venus
Titov, Dmitrij V.; Ignatiev, Nikolay I.; Wilson, Colin F. +2 more
More than three decades have passed since the publication of the last review of the Venus clouds and hazes. The paper published in 1983 in the Venus book summarized the discoveries and findings of the US Pioneer Venus and a series of Soviet Venera spacecraft (Esposito et al. in Venus, p. 484, 1983). Due to the emphasis on in-situ investigations fr…
NOMAD, an Integrated Suite of Three Spectrometers for the ExoMars Trace Gas Mission: Technical Description, Science Objectives and Expected Performance
Aoki, S.; Vandaele, A. C.; Daerden, F. +50 more
The NOMAD ("Nadir and Occultation for MArs Discovery") spectrometer suite on board the ExoMars Trace Gas Orbiter (TGO) has been designed to investigate the composition of Mars' atmosphere, with a particular focus on trace gases, clouds and dust. The detection sensitivity for trace gases is considerably improved compared to previous Mars missions, …
Cometary Dust
Langevin, Yves; Thomas, Nicolas; Agarwal, Jessica +11 more
This review presents our understanding of cometary dust at the end of 2017. For decades, insight about the dust ejected by nuclei of comets had stemmed from remote observations from Earth or Earth's orbit, and from flybys, including the samples of dust returned to Earth for laboratory studies by the Stardust return capsule. The long-duration Roset…
Partial Variance of Increments Method in Solar Wind Observations and Plasma Simulations
Perri, S.; Matthaeus, W. H.; Wan, M. +4 more
The method called "PVI" (Partial Variance of Increments) has been increasingly used in analysis of spacecraft and numerical simulation data since its inception in 2008. The purpose of the method is to study the kinematics and formation of coherent structures in space plasmas, a topic that has gained considerable attention, leading the development …
Composition and Chemistry of the Neutral Atmosphere of Venus
Marcq, Emmanuel; Vandaele, Ann Carine; Parkinson, Christopher D. +1 more
This paper deals with the composition and chemical processes occurring in the neutral atmosphere of Venus. Since the last synthesis, observers as well as modellers have emphasised the spatial and temporal variability of minor species, going beyond a static and uniform picture that may have prevailed in the past. The outline of this paper acknowled…
Water Reservoirs in Small Planetary Bodies: Meteorites, Asteroids, and Comets
Altwegg, Kathrin; Alexander, Conel M. O'D.; McKeegan, Kevin D.
Asteroids and comets are the remnants of the swarm of planetesimals from which the planets ultimately formed, and they retain records of processes that operated prior to and during planet formation. They are also likely the sources of most of the water and other volatiles accreted by Earth. In this review, we discuss the nature and probable origin…