气候变化领域集成服务门户(CCPortal): Localized Heating of the Martian Topside Ionosphere Through the Combined Effects of Magnetic Pumping by Large-Scale Magnetosonic Waves and Pitch Angle Diffusion by Whistler Waves

CCPortal

DOI	10.1029/2019GL086408
	Localized Heating of the Martian Topside Ionosphere Through the Combined Effects of Magnetic Pumping by Large-Scale Magnetosonic Waves and Pitch Angle Diffusion by Whistler Waves
	Fowler C.M.; Agapitov O.V.; Xu S.; Mitchell D.L.; Andersson L.; Artemyev A.; Espley J.; Ergun R.E.; Mazelle C.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:5
英文摘要	We present Mars Atmosphere and Volatile EvolutioN (MAVEN) observations of periodic ((Formula presented.) 25 s) large-scale (hundreds of km) magnetosonic waves propagating into the Martian dayside upper ionosphere. These waves adiabatically modulate the superthermal electron distribution function, and the induced electron temperature anisotropies drive the generation of observed electromagnetic whistler waves. The localized (in altitude) minimum in the ratio (Formula presented.) pe/ (Formula presented.) ce provides conditions favorable for the local enhancement of efficient wave-particle interactions, so that the induced whistlers act back on the superthermal electron population to isotropize the plasma through pitch angle scattering. These wave-particle interactions break the adiabaticity of the large-scale magnetosonic wave compressions, leading to local heating of the superthermal electrons during compressive wave “troughs.” Further evidence of this heating is observed as the subsequent phase shift between the observed perpendicular-to-parallel superthermal electron temperatures and compressive wave fronts. This heating mechanism may be important at other unmagnetized bodies. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Distribution functions; Electron temperature; Electrons; Heating; Ionosphere; Ionospheric measurement; Particle interactions; Wave plasma interactions; Wavefronts; Electron temperature anisotropy; Magnetic pumping; Pitch angle; Superthermal electron populations; Superthermal electrons; Top-side ionosphere; Wave-particle interactions; Whistler waves; Atmospherics; adiabatic process; electromagnetic wave; heating; ionosphere; Mars; plasma; temperature effect; British Columbia; Canada; Whistler; Pachycephalidae
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170623
作者单位	Space Sciences Laboratory, University of California, Berkeley, Berkeley, CA, United States; Laboratory of Atmospheric and Space Physics, University of Colorado Boulder, Boulder, CO, United States; Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA, United States; NASA Goddard Space Flight Center, Greenbelt, MD, United States; IRAP, University of Toulouse-CNRS-UPS-CNES, Toulouse, France
推荐引用方式 GB/T 7714	Fowler C.M.,Agapitov O.V.,Xu S.,et al. Localized Heating of the Martian Topside Ionosphere Through the Combined Effects of Magnetic Pumping by Large-Scale Magnetosonic Waves and Pitch Angle Diffusion by Whistler Waves[J],2020,47(5).
APA	Fowler C.M..,Agapitov O.V..,Xu S..,Mitchell D.L..,Andersson L..,...&Mazelle C..(2020).Localized Heating of the Martian Topside Ionosphere Through the Combined Effects of Magnetic Pumping by Large-Scale Magnetosonic Waves and Pitch Angle Diffusion by Whistler Waves.Geophysical Research Letters,47(5).
MLA	Fowler C.M.,et al."Localized Heating of the Martian Topside Ionosphere Through the Combined Effects of Magnetic Pumping by Large-Scale Magnetosonic Waves and Pitch Angle Diffusion by Whistler Waves".Geophysical Research Letters 47.5(2020).