Accurately characterizing the importance of wave‐particle interactions in radiation belt dynamics: The pitfalls of statistical wave representations. Issue 8 (25th August 2016)

• Record Type: Journal Article
• Authors: Murphy, Kyle R.; Mann, Ian R.; Rae, I. Jonathan; Sibeck, David G.; Watt, Clare E. J.
• Is Part Of: Journal of geophysical research. Volume 121:Issue 8(2016:Aug.)
• Page Start: 7895
• Page End: 7899
• Publication Date: 2016-08-25
• Subjects: ULF waves -- radiation belts -- geomagnetic storms -- wave‐particle interactions -- modeling; Magnetospheric physics -- Periodicals; Space environment -- Periodicals; Cosmic physics -- Periodicals; Planets -- Atmospheres -- Periodicals; Heliosphere (Astrophysics) -- Periodicals; Geophysics -- Periodicals; 523.01
• DOI: 10.1002/2016JA022618
• Languages: English
• ISSNs: 2169-9380

Abstract

Abstract: Wave‐particle interactions play a crucial role in energetic particle dynamics in the Earth's radiation belts. However, the relative importance of different wave modes in these dynamics is poorly understood. Typically, this is assessed during geomagnetic storms using statistically averaged empirical wave models as a function of geomagnetic activity in advanced radiation belt simulations. However, statistical averages poorly characterize extreme events such as geomagnetic storms in that storm‐time ultralow frequency wave power is typically larger than that derived over a solar cycle and Kp is a poor proxy for storm‐time wave power. Key Points: Storm‐time wave power varies significantly and is typically larger than that of empirical models derived from extended data sets Geomagnetic activity indices are a poor proxy for storm‐time wave power More accurate empirical models of wave power are required