Dropouts of Fully Stripped Ions in the Solar Wind: A Diagnostic for Wave Heating versus Reconnection
arXiv:2208.12193 · doi:10.3847/1538-4357/ac8976
Abstract
The SWICS instrument aboard the ACE satellite has detected frequent intervals in the slow solar wind and interplanetary coronal mass ejections (ICMEs) in which C6+ and other fully stripped ions are strongly depleted, though the ionization states of elements such as Si and Fe indicate that those ions should be present. It has been suggested that these outlier or dropout events can be explained by the resonant cyclotron heating process, because these ions all have the same cyclotron frequency as He2+. We investigate the region in the corona where these outlier events form. It must be above the ionization freeze-in height and the transition to collisionless plasma conditions, but low enough that the wind still feels the effects of solar gravity. We suggest that the dropout events correspond to relatively dense blobs of gas in which the heating is reduced because local variations in the Alfven speed change the reflection of Alfven waves and the turbulent cascade. As a result, the wave power at the cyclotron frequency of the fully stripped ions is absorbed by He2+ and may not be able to heat the other fully-stripped ions enough to overcome solar gravity. If this picture is borne out, it may help to discriminate between resonant cyclotron heating and stochastic heating models of the solar wind.
References in corpus (35)
- Reconnection in a Weakly Stochastic Field
- Alfven Wave Solar Model (AWSoM): Coronal Heating
- Perpendicular Ion Heating by Low-Frequency Alfven-Wave Turbulence in the Solar Wind
- A turbulence-driven model for heating and acceleration of the fast wind in coronal holes
- CHIANTI - an atomic database for emission lines - Paper XV: Version 9, improvements for the X-ray satellite lines
- Magnetic reconnection and stochastic plasmoid chains in high-Lundquist-number plasmas
- Reconnection Outflows and Current Sheet Observed with Hinode/XRT in the 2008 April 9 "Cartwheel CME" Flare
- Spectroscopic Observations of Current Sheet Formation and Evolution
- Alfven Wave Reflection and Turbulent Heating in the Solar Wind from 1 Solar Radius to 1 AU: an Analytical Treatment
- Element Abundances: A New Diagnostic for the Solar Wind
- Heating and Acceleration of the Fast Solar Wind by Alfvén Wave Turbulence
- Statistics of coronal dimmings associated with coronal mass ejections. I. Characteristic dimming properties and flare association
- Proton, Electron, and Ion Heating in the Fast Solar Wind from Nonlinear Coupling Between Alfvenic and Fast-Mode Turbulence
- Ion Charge States in Halo CMEs: What can we Learn about the Explosion?
- An Efficient Approximation of the Coronal Heating Rate for Use in Global Sun-Heliosphere Simulations
- The First Ionization Potential Effect from the Ponderomotive Force: On the Polarization and Coronal Origin of the Alfven Waves
- Three Dimensional Structure and Energy Balance of a Coronal Mass Ejection
- Plasma Heating During a Coronal Mass Ejection Observed by SOHO
- The Solar Corona as probed by Comet Lovejoy (C/2011 W3)
- The Formation of Heliospheric Arcs of Slow Solar Wind
- A Steady-State Picture of Solar Wind Acceleration and Charge State Composition Derived from a Global Wave-Driven MHD Model
- Helium Variation Across Two Solar Cycles Reveals A Speed-Dependent Phase Lag
- Plumelets: Dynamic Filamentary Structures in Solar Coronal Plumes
- Evolution of The Proton Velocity Distribution due to Stochastic Heating in the Near-Sun Solar Wind
- The drivers of active region outflows into the slow solar wind
- In Situ Heating of the 2007 May 19 CME Ejecta Detected by STEREO/PLASTIC and ACE
- Density Fluctuations in a Polar Coronal Hole
- Ion Charge States in a Time-Dependent Wave-Turbulence-Driven Model of the Solar Wind
- The high helium abundance and charge states of the interplanetary CME and its material source on the Sun
- Analysis of UV and EUV emission from impacts on the Sun after 2011 June 7 eruptive flare
- On the production of He of solar origin in the solar wind
- Evidence for Parameteric Decay Instability in the Lower Solar Atmosphere
- Constraining the CME Core Heating and Energy Budget with SOHO/UVCS
- Comparative Analyses of Plasma Properties and Composition in Two Types of Small-Scale Interplanetary Flux-ropes
- Comparison of the Scaling Properties of EUV Intensity Fluctuations in Coronal Hole and Quiet-Sun Regions