☆ 4.7 Article

Energetic ion precipitation at Titan

GEOPHYSICAL RESEARCH LETTERS (2008)

期刊

GEOPHYSICAL RESEARCH LETTERS

卷 35, 期 3, 页码 -

出版社

AMER GEOPHYSICAL UNION

DOI: 10.1029/2007GL032451

关键词

-

类别

Geosciences, Multidisciplinary

向作者/读者索取更多资源

Protocol

Reagent

摘要

Energetic protons and oxygen ions have been observed in Saturn's outer magnetosphere and can precipitate into Titan's atmosphere where they deposit energy, ionize, and drive ionospheric chemistry. Ion production rates caused by this precipitation are calculated using fluxes of incident 27 keV to 4 MeV protons measured by the Cassini MIMI instrument. We find that significant ion production rates exist in the 500 km to 1000 km altitude range and estimate associated electron densities of about 200-2000 cm(-3) in reasonable agreement with measured densities. We demonstrate that energetic oxygen ions do not penetrate below about 650 km, but they can also generate significant ionization. We suggest that a few percent of the oxygen flux is converted to negative O ions as a consequence of charge exchange collisions, which might help explain the negative ions observed near 960 km by the Cassini CAPS instrument.

作者

我是这篇论文的作者

点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7

评分不足

次要评分

新颖性

-

重要性

-

科学严谨性

-

评价这篇论文

推荐

Article Geosciences, Multidisciplinary

A Customized Multi-Scale Deep Learning Framework for Storm Nowcasting

Shangshang Yang, Huiling Yuan

Summary: Storm nowcasting is critical and urgently needed. Recent advances in deep learning (DL) have shown potential for improving nowcasting accuracy, but struggle with high-impact storms. To address this, a customized multi-scale DL framework was proposed, which demonstrated improved performance on intense storms. The framework preserved storm shape and provided accurate forecasts for longer time periods.

GEOPHYSICAL RESEARCH LETTERS (2023)

添加到收藏夹

Article Multidisciplinary Sciences

Ozone impact from solar energetic particles cools the polar stratosphere

Monika E. Szelag, Daniel R. Marsh, Pekka T. Verronen, Annika Seppala, Niilo Kalakoski

Summary: This study examines the impact of solar energetic particle precipitation (EPP) on the polar stratosphere using a chemistry-climate model. The findings suggest that the current EPP forcing used in climate simulations underestimates its effects on ozone and temperature. The study highlights the need for an improved representation of decadal EPP forcing in climate simulations.

NATURE COMMUNICATIONS (2022)

添加到收藏夹

Article Astronomy & Astrophysics

Titan's haze at opposite seasons from HST-STIS spectroscopy

Erich Karkoschka

Summary: An analysis of three new image cubes of Titan by the Space Telescope Imaging Spectrograph reveals that Titan's seasonal variation is close to harmonic and not influenced by variations due to Saturn's orbital eccentricity. The reversal consists of two components, with small temporary deviations observed. These new observations provide an improved seasonal model that will help in future global circulation models of Titan.

ICARUS (2022)

添加到收藏夹

Article Geosciences, Multidisciplinary

Bursty Energetic Electron Precipitation by High-Order Resonance With Very-Oblique Whistler-Mode Waves

Longzhi Gan, Anton Artemyev, Wen Li, Xiao-Jia Zhang, Qianli Ma, Didier Mourenas, Vassilis Angelopoulos, Ethan Tsai, Colin Wilkins

Summary: Resonant interactions between energetic electrons and whistler-mode waves are important for rapid electron precipitation. This study provides the first direct evidence for high-order resonant scattering driven precipitation, explaining a bursty precipitation event. The results highlight the importance of high-order resonant scattering in both long-term diffusion models and short timescale events.

GEOPHYSICAL RESEARCH LETTERS (2023)

添加到收藏夹

Article Green & Sustainable Science & Technology

Synthesis and Characterization of the Carbonate Hydrotalcites (NiAl-HT, CoAl-HT, and NiCoAl-HT), and Its Application for Removal of the Anionic Azo Dye Titan Yellow from Aqueous Solution

Samira Chouikh, Sabrina Cheikh, Ali Imessaoudene, Lotfi Mouni, Abdeltif Amrane, Amine Benahmed, Noureddine Bettahar

Summary: This study focuses on the removal of Titan Yellow (TY) dye using three matrices of layered double hydroxide (LDHs) synthesized by co-precipitation. The synthesized LDHs showed LDH type phase, with specific characteristics confirmed by XRD, FT-IR, TG/DTG, BET, and SEM-EDX analyses. The adsorption of TY dye was found to be more efficient in NiAl-HT, and the process was determined to be endothermic and spontaneous.

SUSTAINABILITY (2023)

添加到收藏夹

Article Astronomy & Astrophysics

Dawn-Dusk Asymmetry of Energetic Electron at LEO During a Storm: Observation by FY3E

Yi-Xin Sun, Qiu-Gang Zong, Ying Liu, Yu-Guang Ye, Hong Zou, Chao Yue, Xu-Zhi Zhou, Yi-Xin Hao

Summary: Electrons in Low Earth Orbit have been a popular research topic, but limited measurements have hindered our understanding of the radiation environment. The recently launched satellite FY3E, equipped with the Medium-Energy Electron Detector, is changing this by providing comprehensive measurements. The findings reveal dawn-dusk asymmetry in electron precipitation during storms.

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS (2023)

添加到收藏夹

Article Geosciences, Multidisciplinary

Reducing Surface Wetness Leads to Tropical Hydrological Cycle Regime Transition

Bowen Fan, Zhihong Tan, Tiffany A. Shaw, Edwin S. Kite

Summary: The research shows that changes in surface wetness can impact the hydrological cycle in tropical regions. Decreased surface wetness leads to a transition from a rainy regime to a rain-free regime, with near-surface relative humidity changes playing a dominant role in this transition.

GEOPHYSICAL RESEARCH LETTERS (2021)

添加到收藏夹

Article Astronomy & Astrophysics

The interaction of deep convection with the general circulation in Titan's atmosphere. Part 1: Cloud resolving simulations

Scot C. R. Rafkin, Juan M. Lora, Alejandro Soto, J. Michael Battalio

Summary: The deep convective cloud-environment feedback loop is crucial for understanding Titan's global methane, energy, and momentum cycles. This study uses cloud resolving modeling to quantify the effects of deep convective methane storms on their environment and improve parameterizations in global models.

ICARUS (2022)

添加到收藏夹

Article Geosciences, Multidisciplinary

Modulation of Energetic Electron Precipitation Driven by Three Types of Whistler Mode Waves

Xiao-Chen Shen, Wen Li, Luisa Capannolo, Qianli Ma, Murong Qin, Anton V. Artemyev, Vassilis Angelopoulos, Xiao-Jia Zhang, Sheng Huang

Summary: This study quantitatively evaluates the role of plasma waves in precipitating energetic electrons and finds that hiss, plume hiss, and chorus waves drive modulated electron precipitation. The spatial modulation of electron precipitation is correlated with wave intensities. Quasi-linear analysis supports the observed energy range and ratio of precipitating-to-trapped flux.

GEOPHYSICAL RESEARCH LETTERS (2023)

添加到收藏夹

Article Chemistry, Physical

Energy Retention in Thin Graphite Targets after Energetic Ion Impact

Damjan Ivekovic, Petar, Marko Karlusic

Summary: High energy ion irradiation is crucial for nanoscale material modification, but subsequent energy release from electron emission can hinder the process. This study used Geant4 code to track energy dissipation in thin graphite targets after ion impact, revealing a significant release of energy. Understanding this phenomenon is important for ion track formation in thin targets.

MATERIALS (2021)

添加到收藏夹

Article Geochemistry & Geophysics

Barium isotope fractionation in barite-fluid systems at chemical equilibrium

J. T. Middleton, W. -l. Hong, A. Paytan, M. E. Auro, E. M. Griffith, T. J. Horner

Summary: The barium isotope composition of sedimentary barite is a powerful tool for studying the sources and cycling of barium in marine environments. Ion exchange, particularly in mineral-fluid systems, plays an important role in the fractionation of Ba isotopes in BaSO4. The experiments conducted under marine-relevant conditions reveal the rate and isotopic effect associated with ion exchange in BaSO4-fluid systems.

CHEMICAL GEOLOGY (2023)

添加到收藏夹

Review Astronomy & Astrophysics

Energetic Electron Precipitation Driven by Electromagnetic Ion Cyclotron Waves from ELFIN's Low Altitude Perspective

V. Angelopoulos, X. -j. Zhang, A. V. Artemyev, D. Mourenas, E. Tsai, C. Wilkins, A. Runov, J. Liu, D. L. Turner, W. Li, K. Khurana, R. E. Wirz, V. A. Sergeev, X. Meng, J. Wu, M. D. Hartinger, T. Raita, Y. Shen, X. An, X. Shi, M. F. Bashir, X. Shen, L. Gan, M. Qin, L. Capannolo, Q. Ma, C. L. Russell, E. V. Masongsong, R. Caron, I. He, L. Iglesias, S. Jha, J. King, S. Kumar, K. Le, J. Mao, A. McDermott, K. Nguyen, A. Norris, A. Palla, A. Roosnovo, J. Tam, E. Xie, R. C. Yap, S. Ye, C. Young, L. A. Adair, C. Shaffer, M. Chung, P. Cruce, M. Lawson, D. Leneman, M. Allen, M. Anderson, M. Arreola-Zamora, J. Artinger, J. Asher, D. Branchevsky, M. Cliffe, K. Colton, C. Costello, D. Depe, B. W. Domae, S. Eldin, L. Fitzgibbon, A. Flemming, D. M. Frederick, A. Gilbert, B. Hesford, R. Krieger, K. Lian, E. McKinney, J. P. Miller, C. Pedersen, Z. Qu, R. Rozario, M. Rubly, R. Seaton, A. Subramanian, S. R. Sundin, A. Tan, D. Thomlinson, W. Turner, G. Wing, C. Wong, A. Zarifian

Summary: We reviewed observations of EMIC wave-driven energetic electron precipitation using ELFIN mission data. The precipitation exhibits distinct features in energy-spectrograms, with abrupt bursts and substructure. The bursty nature is attributed to the spatial extent and structure of the wave field at the equator. Multiple ELFIN passes allow for the study of spatial and temporal evolution of the EMIC wave - electron interaction region.

SPACE SCIENCE REVIEWS (2023)

添加到收藏夹

Editorial Material Microbiology

Sowing the seeds of infection

Elizabeth R. Ballou, Rebecca A. Drummond

Summary: In this study, a fungal morphotype uniquely adapted for extrapulmonary dissemination was identified, contributing to invasive infection and evasion of host immune responses.

CELL HOST & MICROBE (2022)

添加到收藏夹

Article Geosciences, Multidisciplinary

Planetary Waves Controlling the Effect of Energetic Electron Precipitation on the Northern Polar Vortex

Antti Salminen, Timo Asikainen, Kalevi Mursula

Summary: The impact of energetic electron precipitation (EEP) on the polar vortex is modulated by planetary waves, with the strongest strengthening effect observed when planetary wave propagation is enhanced at mid-latitudes and reduced at polar latitudes.

GEOPHYSICAL RESEARCH LETTERS (2022)

添加到收藏夹

Article Geosciences, Multidisciplinary

Lower Surface Temperature at Bright Ephemeral Feature Site on Titan's North Pole

Rajani D. Dhingra, Donald E. Jennings, Jason W. Barnes, Valeria Cottini

Summary: Through analyzing the spectra obtained by Cassini's Composite Infrared Spectrometer, researchers discovered bright ephemeral features (BEFs) in one of the regions on Titan. These BEFs are believed to be broad-specular reflections caused by a smooth surface or near surface fog, indicating interaction between the atmosphere and the surface. During the T121 flyby, a decrease in temperature at the surface emission window suggests precipitative cooling following rainfall on Titan's land/sea surface.

GEOPHYSICAL RESEARCH LETTERS (2021)

添加到收藏夹

Article Astronomy & Astrophysics

Energetic Particle Signatures Above Saturn's Aurorae

A. Bader, S. V. Badman, L. C. Ray, C. P. Paranicas, C. T. S. Lorch, G. Clark, M. Andre, D. G. Mitchell, D. A. Constable, J. Kinrade, G. J. Hunt, W. Pryor

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS (2020)

添加到收藏夹

Article Astronomy & Astrophysics

The Composition of ∼96 keV W+ in Saturn's Magnetosphere

R. D. DiFabio, S. P. Christon, D. C. Hamilton, D. G. Mitchell, S. M. Krimigis

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS (2020)

添加到收藏夹

Article Astronomy & Astrophysics

An Explanation of the Nightside Ionospheric Structure of Venus

Stephen H. Brecht, Stephen A. Ledvina

Summary: Hybrid simulations of Venus have successfully reproduced nightside structures that are consistent with observations from spacecraft such as the Pioneer Venus Orbiter. The simulations show that the structure is generated when the P-e ambipolar electric field aligns with the local IMF direction, and the orientation of the IMF controls the location of the tail structure on the nightside. The agreement between the simulation results and data from spacecraft observations increases confidence in the validity of the simulations.

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS (2021)

添加到收藏夹

Article Astronomy & Astrophysics

Ions Measured by Voyager 1 Outside the Heliopause to ∼28 au and Implications Thereof

Konstantinos Dialynas, Stamatios M. Krimigis, Robert B. Decker, Matthew E. Hill

Summary: This study reports in situ ion measurements from Voyager 1 from 2000 to 2020, identifying radial outflow of energetic ions in the heliosheath. The intensity spectrum shows a power-law form in energy with a spectral index of about -1.4, indicating leakage of ions from the heliosheath into interstellar space. Future modeling efforts should consider this ion population for communication between the heliosheath and the local interstellar medium.

ASTROPHYSICAL JOURNAL (2021)

添加到收藏夹

Article Geosciences, Multidisciplinary

A Revised Understanding of the Structure of the Venusian Magnetotail From a High-Altitude Intercept With a Tail Ray by Parker Solar Probe

Glyn A. Collinson, Robin Ramstad, Rudy Frahm, Lynn Wilson, Shaosui Xu, Phyllis Whittlesey, Stephen H. Brecht, Stephen Ledvina

Summary: One of the major discoveries of NASA's Pioneer Venus Orbiter and Parker Solar Probe is the formation of comet-like tail rays in the nightside ionosphere of Venus. The observations from both missions provide evidence of the altitude range and structure of the Venusian Ionotail Rays. Combined data analysis and hybrid modeling have contributed to a unified understanding of the magnetotail of Venus.

GEOPHYSICAL RESEARCH LETTERS (2022)

添加到收藏夹

Article Astronomy & Astrophysics

On the Energy Dependence of Galactic Cosmic Ray Anisotropies in the Very Local Interstellar Medium

Romina Nikoukar, Matthew E. Hill, Lawrence Brown, Jozsef Kota, Robert B. Decker, Konstantinos Dialynas, Douglas C. Hamilton, Stamatios M. Krimigis, Scott Lasley, Edmond C. Roelof, J. Grant Mitchell, Vladimir Florinski, Joe Giacalone, John Richardson, Merav Opher

Summary: This paper reports on the energy dependence of Galactic cosmic rays (GCRs) in the very local interstellar medium (VLISM) as measured by the Low Energy Charged Particle (LECP) instrument on the Voyager 1 spacecraft. The study found that there is a decreasing trend in the amplitude of second-order anisotropy with increasing energy during anisotropy episodes.

ASTROPHYSICAL JOURNAL (2022)

添加到收藏夹

Article Astronomy & Astrophysics

Fourier Analysis of Magnetic Fields in the Ionosphere of Mars

T. E. Cravens, O. Hamil, A. Renzaglia, S. A. Ledvina, S. K. Howard

Summary: The main sources of the magnetic field in the Martian ionosphere are the solar wind interaction with the planet and remnant crustal magnetization, mainly in the southern hemisphere. This study used Fourier analysis to quantify, interpret, and compare the magnetic fields in the ionosphere and solar wind, suggesting plasma movement from the pile-up region to the ionosphere. The findings also indicate the possible creation of a magnetic structure within the ionosphere itself.

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS (2023)

添加到收藏夹

Article Astronomy & Astrophysics

Periodic Narrowband Radio Wave Emissions and Inward Plasma Transport at Saturn's Magnetosphere

S. Wing, P. C. Brandt, D. G. Mitchell, J. R. Johnson, W. S. Kurth, J. D. Menietti

ASTRONOMICAL JOURNAL (2020)

添加到收藏夹

Article Astronomy & Astrophysics

3He-rich Solar Energetic Particle Observations at the Parker Solar Probe and near Earth

M. E. Wiedenbeck, R. Bucik, G. M. Mason, G. C. Ho, R. A. Leske, C. M. S. Cohen, E. R. Christian, A. C. Cummings, A. J. Davis, M. Desai, J. Giacalone, D. K. Haggerty, M. E. Hill, C. J. Joyce, A. W. Labrador, O. Malandraki, W. H. Matthaeus, D. J. McComas, R. L. McNutt, R. A. Mewaldt, D. G. Mitchell, A. Posner, J. S. Rankin, E. C. Roelof, N. A. Schwadron, E. C. Stone, J. R. Szalay, S. D. Bale, A. W. Case, J. C. Kasper, K. E. Korreck, D. E. Larson, R. J. MacDowall, M. Pulupa, M. L. Stevens

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES (2020)

添加到收藏夹

Article Astronomy & Astrophysics

Seed Population Preconditioning and Acceleration Observed by the Parker Solar Probe

N. A. Schwadron, S. Bale, J. Bonnell, A. Case, E. R. Christian, C. M. S. Cohen, A. C. Cummings, A. J. Davis, T. Dudok de Wit, W. de Wet, M. I. Desai, C. J. Joyce, K. Goetz, J. Giacalone, M. Gorby, P. Harvey, B. Heber, M. E. Hill, M. Karavolos, J. C. Kasper, K. Korreck, D. Larson, R. Livi, R. A. Leske, O. Malandraki, R. MacDowall, D. Malaspina, W. H. Matthaeus, D. J. McComas, R. L. McNutt, R. A. Mewaldt, D. G. Mitchell, L. Mays, J. T. Niehof, D. Odstrcil, M. Pulupa, B. Poduval, J. S. Rankin, E. C. Roelof, M. Stevens, E. C. Stone, J. R. Szalay, M. E. Wiedenbeck, R. Winslow, P. Whittlesey

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES (2020)

添加到收藏夹

Article Astronomy & Astrophysics

CME-associated Energetic Ions at 0.23 au: Consideration of the Auroral Pressure Cooker Mechanism Operating in the Low Corona as a Possible Energization Process

D. G. Mitchell, J. Giacalone, R. C. Allen, M. E. Hill, R. L. McNutt, D. J. McComas, J. R. Szalay, N. A. Schwadron, A. P. Rouillard, S. B. Bale, C. C. Chaston, M. P. Pulupa, P. L. Whittlesey, J. C. Kasper, R. J. MacDowall, E. R. Christian, M. E. Wiedenbeck, W. H. Matthaeus

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES (2020)

添加到收藏夹

Article Astronomy & Astrophysics

Observations of the 2019 April 4 Solar Energetic Particle Event at the Parker Solar Probe

R. A. Leske, E. R. Christian, C. M. S. Cohen, A. C. Cummings, A. J. Davis, M. I. Desai, J. Giacalone, M. E. Hill, C. J. Joyce, S. M. Krimigis, A. W. Labrador, O. Malandraki, W. H. Matthaeus, D. J. McComas, R. L. McNutt, R. A. Mewaldt, D. G. Mitchell, A. Posner, J. S. Rankin, E. C. Roelof, N. A. Schwadron, E. C. Stone, J. R. Szalay, M. E. Wiedenbeck, A. Vourlidas, S. D. Bale, R. J. MacDowall, M. Pulupa, J. C. Kasper, R. C. Allen, A. W. Case, K. E. Korreck, R. Livi, M. L. Stevens, P. Whittlesey, B. Poduval

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES (2020)

添加到收藏夹

Article Astronomy & Astrophysics

Energetic Particle Observations from the Parker Solar Probe Using Combined Energy Spectra from the IS⊙IS Instrument Suite

C. J. Joyce, D. J. McComas, E. R. Christian, N. A. Schwadron, M. E. Wiedenbeck, R. L. McNutt, C. M. S. Cohen, R. A. Leske, R. A. Mewaldt, E. C. Stone, A. W. Labrador, A. J. Davis, A. C. Cummings, D. G. Mitchell, M. E. Hill, E. C. Roelof, J. R. Szalay, J. S. Rankin, M. I. Desai, J. Giacalone, W. H. Matthaeus

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES (2020)

添加到收藏夹

Article Astronomy & Astrophysics

Solar Energetic Particles Produced by a Slow Coronal Mass Ejection at ∼0.25 au

J. Giacalone, D. G. Mitchell, R. C. Allen, M. E. Hill, R. L. McNutt, J. R. Szalay, M. I. Desai, A. P. Rouillard, A. Kouloumvakos, D. J. McComas, E. R. Christian, N. A. Schwadron, M. E. Wiedenbeck, S. Bale, L. E. Brown, A. Case, X. Chen, C. M. S. Cohen, C. Joyce, J. C. Kasper, K. G. Klein, K. Korreck, D. E. Larson, R. Livi, R. A. Leske, R. J. MacDowall, W. H. Matthaeus, R. A. Mewaldt, T. Nieves-Chinchilla, M. Pulupa, E. C. Roelof, M. L. Stevens, A. Szabo, P. L. Whittlesey

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES (2020)

添加到收藏夹

Article Astronomy & Astrophysics

A Foreshock Model for Interstellar Shocks of Solar Origin: Voyager 1 and 2 Observations

D. A. Gurnett, W. S. Kurth, E. C. Stone, A. C. Cummings, B. Heikkila, N. Lal, S. M. Krimigis, R. B. Decker, N. F. Ness, L. F. Burlaga

Summary: The Voyager 1 and Voyager 2 spacecraft, launched in 1977, successfully reached the heliopause region and made significant discoveries, providing valuable insights into the outer heliosphere and interstellar medium.

ASTRONOMICAL JOURNAL (2021)

添加到收藏夹

暂无数据

© Peeref 2019-2024. All rights reserved.