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Electrostatic Electron Cyclotron Harmonic Waves as a Candidate to Cause Pulsating Auroras
Author(s) -
Fukizawa M.,
Sakanoi T.,
Miyoshi Y.,
Hosokawa K.,
Shiokawa K.,
Katoh Y.,
Kazama Y.,
Kumamoto A.,
Tsuchiya F.,
Miyashita Y.,
Tanaka Y. M.,
Kasahara Y.,
Ozaki M.,
Matsuoka A.,
Matsuda S.,
Hikishima M.,
Oyama S.,
Ogawa Y.,
Kurita S.,
Fujii R.
Publication year - 2018
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2018gl080145
Subject(s) - physics , electron , cyclotron , van allen radiation belt , cyclotron resonance , atomic physics , pitch angle , harmonic , computational physics , geophysics , magnetosphere , plasma , nuclear physics , quantum mechanics
Pulsating auroras (PsAs) are thought to be generated by precipitating electrons scattered by lower‐band chorus (LBC) waves near the magnetic equator. One‐to‐one correlation between the LBC intensity and the PsA intensity has been reported. Electrostatic electron cyclotron harmonic (ECH) waves can also scatter electrons. However, direct correlation between ECH and PsA has not been reported yet. In this study, using a coordinated Exploration of energization and Radiation in Geospace (Arase) satellite and ground‐based imager observation, we report that not only LBC but also ECH have correlation with PsA. We estimated the precipitating electron energy by assuming that the time lag when the cross‐correlation coefficient became the highest was travel time of electrons from the modulation region. We found that the estimated energies show reasonable values as the cyclotron resonance energy of each wave.