scholarly journals Modeling cross L shell impacts of magnetopause shadowing and ULF wave radial diffusion in the Van Allen belts

2014 ◽  
Vol 41 (19) ◽  
pp. 6556-6562 ◽  
Author(s):  
Louis G. Ozeke ◽  
Ian R. Mann ◽  
Drew L. Turner ◽  
Kyle R. Murphy ◽  
Alex W. Degeling ◽  
...  
Keyword(s):  
Radial Diffusion ◽  
Ulf Wave ◽  
Van Allen Belts

ULF Wave Power During Geomagnetic Storms and Implications for Radial Diffusion Processes

2021 ◽  
Author(s):  
Jasmine Sandhu ◽  
Jonathan Rae ◽  
John Wygant ◽  
Aaron Breneman ◽  
Sheng Tian ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Diffusion Coefficients ◽  
Radiation Belt ◽  
Geomagnetic Storms ◽  
Radial Diffusion ◽  
Ulf Waves ◽  
Wave Power ◽  
Outer Radiation Belt ◽  
Large Variability ◽  
Ulf Wave

<p>Ultra Low Frequency (ULF) waves drive radial diffusion of radiation belt electrons, where this process contributes to and, at times, dominates energisation, loss, and large scale transport of the outer radiation belt. In this study we quantify the changes and variability in ULF wave power during geomagnetic storms, through a statistical analysis of Van Allen Probes data for the time period spanning 2012 – 2019. The results show that global wave power enhancements occur during the main phase, and continue into the recovery phase of storms. Local time asymmetries show sources of ULF wave power are both external solar wind driving as well as internal sources from coupling with ring current ions and substorms.</p><p>The statistical analysis demonstrates that storm time ULF waves are able to access lower L values compared to pre-storm conditions, with enhancements observed within L = 4. We assess how magnetospheric compressions and cold plasma distributions shape how ULF wave power propagates through the magnetosphere. Results show that the Earthward displacement of the magnetopause is a key factor in the low L enhancements. Furthermore, the presence of plasmaspheric plumes during geomagnetic storms plays a crucial role in trapping ULF wave power, and contributes significantly to large storm time enhancements in ULF wave power.</p><p>The results have clear implications for enhanced radial diffusion of the outer radiation belt during geomagnetic storms. Estimates of storm time radial diffusion coefficients are derived from the ULF wave power observations, and compared to existing empirical models of radial diffusion coefficients. We show that current Kp-parameterised models, such as the Ozeke et al. [2014] model, do not fully capture the large variability in storm time radial diffusion coefficients or the extent of enhancements in the magnetic field diffusion coefficients.</p>

Boundaries and enhancements: ULF wave-driven dynamics of energetic particles in the Van Allen belts

2021 ◽  
Author(s):  
Allison N. Javnes ◽  
Jayasri Joseph ◽  
Joshua Doucette ◽  
Daniel N. Baker ◽  
Xinlin Li ◽  
...  
Keyword(s):  
Energetic Particles ◽  
Ulf Wave ◽  
Van Allen Belts

scholarly journals On the dependence of storm time ULF wave power on magnetopause location: Impacts for ULF wave radial diffusion

2015 ◽  
Vol 42 (22) ◽  
pp. 9676-9684 ◽  
Author(s):  
Kyle R. Murphy ◽  
Ian R. Mann ◽  
David G. Sibeck
Keyword(s):  
Radial Diffusion ◽  
Wave Power ◽  
Ulf Wave

scholarly journals Modeling radiation belt radial diffusion in ULF wave fields: 2. Estimating rates of radial diffusion using combined MHD and particle codes

2010 ◽  
Vol 115 (A6) ◽  
pp. n/a-n/a ◽  
Author(s):  
Chia-Lin Huang ◽  
Harlan E. Spence ◽  
Mary K. Hudson ◽  
Scot R. Elkington
Keyword(s):  
Radiation Belt ◽  
Radial Diffusion ◽  
Wave Fields ◽  
Ulf Wave

ULF Wave-Driven Radial Diffusion Simulations of the Outer Radiation Belt

2013 ◽  
pp. 139-150 ◽  
Author(s):  
Louis G. Ozeke ◽  
Ian R. Mann ◽  
Kyle R. Murphy ◽  
I. Jonathan Rae ◽  
Anthony A. Chan
Keyword(s):  
Radiation Belt ◽  
Radial Diffusion ◽  
Outer Radiation Belt ◽  
Ulf Wave

Ultra-relativistic radiation belt extinction and ULF wave radial diffusion: Modeling the September 2014 extended dropout event

2017 ◽  
Vol 44 (6) ◽  
pp. 2624-2633 ◽  
Author(s):  
Louis G. Ozeke ◽  
Ian R. Mann ◽  
Kyle R. Murphy ◽  
David G. Sibeck ◽  
Daniel N. Baker
Keyword(s):  
Radiation Belt ◽  
Radial Diffusion ◽  
Diffusion Modeling ◽  
Ulf Wave

scholarly journals Accurately specifying storm-time ULF wave radial diffusion in the radiation belts

2015 ◽  
Vol 42 (14) ◽  
pp. 5711-5718 ◽  
Author(s):  
Stavros Dimitrakoudis ◽  
Ian R. Mann ◽  
Georgios Balasis ◽  
Constantinos Papadimitriou ◽  
Anastasios Anastasiadis ◽  
...  
Keyword(s):  
Radiation Belts ◽  
Radial Diffusion ◽  
Ulf Wave
Sign in / Sign up

Export Citation Format

Share Document