Search Publications

Transport of Solar Wind H⁺ and He⁺⁺ Ions across Earth’s Bow Shock

Liu, Y.; Dandouras, I.; Rème, H. +10 more

We have investigated the dependence of mass, energy, and charge of solar wind (SW) transport across Earth’s bow shock. An examination of 111 crossings during quiet SW in both quasi-perpendicular and quasi-parallel shock regions shows that 64 crossings had various degrees of heating and thermalization of SW. We found 22 crossings where the SW speed…

A traveling feature in Saturn's rings

Esposito, Larry W.; Sremčević, Miodrag; Albers, Nicole +3 more

The co-orbital satellites of Saturn, Janus and Epimetheus, swap radial positions every 4.0 years. Since Cassini has been in orbit about Saturn, this has occurred on 21 January in 2006, 2010, and 2014. We describe the effects of this radial migration in the Lindblad resonance locations of Janus within the rings. When the swap occurs such that Janus…

Transport and Distribution of Hydroxyl Radicals and Oxygen Atoms from H₂O Photodissociation in the Inner Coma of Comet 67P/Churyumov–Gerasimenko

Ip, Wing-Huen; Thomas, Nicolas; Lai, Ian-Lin +5 more

With a combination of the Direct Simulation Monte Carlo (DSMC) calculation and test particle computation, the ballistic transport process of the hydroxyl radicals and oxygen atoms produced by photodissociation of water molecules in the coma of comet 67P/Churyumov–Gerasimenko is modelled. We discuss the key elements and essential features of such s…

Ocular Shock Front in the Colliding Galaxy IC 2163

Brinks, Elias; Struck, Curtis; Elmegreen, Bruce G. +5 more

ALMA observations in the ¹²CO J=1\to 0 line of the interacting galaxy pair IC 2163 and NGC 2207 at 2″ × 1.″5 resolution reveal how the encounter drives gas to pile up in narrow, ∼1 kpc wide, “eyelids” in IC 2163. IC 2163 and NGC 2207 are involved in a grazing encounter, which has led to the development in IC 2163 of an eye-shaped (ocula…

A Model for the Dust Envelope of the Silicate Carbon Star IRAS 09425-6040

Suh, Kyung-Won

IRAS 09425-6040 (I09425) is a silicate carbon star with conspicuous crystalline silicate and water-ice features and emission excesses in the far-infrared and millimeter (mm) wavelength ranges. To understand properties of the dust envelope of I09425, we propose a physical model based on the observations and known properties of asymptotic giant bran…

Gaia and Variable Stars

Soszyński, I.; Udalski, A.; Szymański, M. K. +9 more

We present a comparison of the Gaia DR1 samples of pulsating variable stars - Cepheids and RR Lyr type - with the OGLE Collection of Variable Stars aiming at the characterization of the Gaia mission performance in the stellar variability domain.

Out of 575 Cepheids and 2322 RR Lyr candidates from the Gaia DR1 samples located in the OGLE footp…

Water Masers in the Andromeda Galaxy. II. Where Do Masers Arise?

Darling, Jeremy; Amiri, Nikta

We present a comparative multiwavelength analysis of water-maser-emitting regions and non-maser-emitting luminous 24 µm star-forming regions in the Andromeda Galaxy (M31) to identify the sites most likely to produce luminous water masers useful for astrometry and proper motion studies. Included in the analysis are Spitzer 24 µm photome…

Origin of the backstreaming ions in a young Hot Flow Anomaly

Vaisberg, O. L.; Shuvalov, S. D.; Shestakov, A. Yu. +1 more

We analyze an event in front of the bow shock observed by Cluster spacecraft on 22.02.2006. This event has many attributes of Hot Flow Anomaly at early stage of development including strong upstream beam and disturbed magnetic profile with increased magnetic field at one or two sides as observed by 4 Cluster spacecraft. The angle between the magne…

Wave-particle resonance condition test for ion-kinetic waves in the solar wind

Glassmeier, K. -H.; Marsch, E.; Narita, Y. +3 more

Conditions for the Landau and cyclotron resonances are tested for 543 waves (identified as local peaks in the energy spectra) in the magnetic field fluctuations of the solar wind measured by the Cluster spacecraft on a tetrahedral scale of 100 km. The resonance parameters are evaluated using the frequencies in the plasma rest frame, the parallel c…

Mission Oriented Support and Theory (MOST) for MMS—the Goddard Space Flight Center/University of California Los Angeles Interdisciplinary Science Program

Hwang, Kyoung-Joo; Goldstein, Melvyn L.; El-Alaoui, Mostafa +8 more

The MOST IDS team was tasked with focusing on two general areas: The first was to participate with the Fast Plasma Investigation (FPI) team in the development of virtual detectors that model the instrument responses of the MMS FPI sensors. The virtual instruments can be "flown through" both simulation data (from magnetohydrodynamic, hybrid, and ki…