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Title: Magnetic Tilt Effect on Externally Driven Electromagnetic Ion Cyclotron (EMIC) Waves

Journal Article · · Geophysical Research Letters
DOI:https://doi.org/10.1029/2022GL101544· OSTI ID:1961248

Abstract We examine coupling of fluctuations in the solar wind with electromagnetic ion cyclotron (EMIC) waves in the magnetosphere using an advanced full‐wave simulation code, Petra‐M. Dipole tilt dramatically affects the coupling process. While very little wave power can reach the inner magnetosphere without tilt effects, a tilted dipole field dramatically increases the efficiency of the coupling process. Solar wind fluctuations incident at high magnetic latitude effectively reaches the ground along the field line and mode‐convert to linearly polarized field‐aligned propagating waves at the Alfvén and IIH resonances. Therefore, solar wind compressions efficiently drive linearly polarized EMIC waves when the dipole angle is tilted toward or away from the Sun‐Earth direction.

Research Organization:
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR). Scientific Discovery through Advanced Computing (SciDAC); National Science Foundation (NSF); National Aeronautics and Space Administration (NASA)
Grant/Contract Number:
AC02‐09CH11466; AC02-09CH11466; AT1030200; AGS1602855; 80HQTR18T0066; 80HQTR19T0076; NNX17AI50G; NNX16AQ87G; 80NSSC19K0270; 80NSSC19K0843; 80NSSC18K0835; 80NSSC20K0355; 80NSSC20K0704; 80NSSC18K1578; 80NSSC21K1678; 80NSSC22K0515; AGS1832207; AGS2131013
OSTI ID:
1961248
Alternate ID(s):
OSTI ID: 1957519; OSTI ID: 1983391
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Vol. 50 Journal Issue: 6; ISSN 0094-8276
Publisher:
American Geophysical Union (AGU)Copyright Statement
Country of Publication:
United States
Language:
English

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