Open AccessAKR modulation and global Pi2 oscillation
Author(s) -
Uozumi Teiji,
Yumoto K.,
Tokunaga T.,
Solovyev S. I.,
Shevtsov B. M.,
Marshall R.,
Liou K.,
Ohtani S.,
Abe S.,
Ikeda A.,
Kitamura K.,
Yoshikawa A.,
Kawano H.,
Itonaga M.
Publication year - 2011
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2010ja016042
Subject(s) - oscillation (cell signaling) , modulation (music) , physics , geophysics , environmental science , geology , acoustics , biology , genetics
In this report we present a temporal relationship between ground Pi2 and auroral kilometric radiation (AKR). We analyzed six isolated substorm events, which were observed by the MAGDAS/CPMN ground magnetometer network and the plasma wave instrument onboard the Polar satellite. We found that the time derivative of the height‐integrated AKR power and the ground Pi2 D component had the same periodicity and that the two were synchronized with each other. When the D component fluctuated with the same (opposite) polarity as the magnetic bay variation, the AKR power tended to increase (decrease) during the corresponding interval. An isolated substorm event ( AE ∼ 40 nT), which occurred around 10:19 UT on 24 January1997, was selected for a detailed study. The behavior of the Pi2 event can be interpreted by the substorm current wedge (SCW) and Pi2 propagation models. It is confirmed that the midlatitude and high‐latitude D component oscillations can be treated as a proxy of the SCW oscillations, whereas the H component oscillations exhibited some phase shifts by the propagation delay of the Pi2 waves. That is, the temporal relation between the time derivative of the AKR power and the ground Pi2 suggests that the height‐integrated AKR power was modulated coherently with the SCW oscillations.