Ground based VLF observations near L = 2.5 during the Hallowen 2003 storm

Abstract

Ground based recordings at Palmer Station, Antarctica (L = 2.44) provide rare observations of VLF waves at low L during and in the aftermath of the Halloween 2003 superstorms. VLF observations in the morning magnetic local time sector for Oct 29 to Nov 5 2003 are compared with daily global average changes in the electron radiation belts near the slot region. Wave activity observed at Palmer was remarkably intense during this period and included discrete chorus emissions, mid-latitude hiss as well as an unusual form of hiss extending up to ∼15 kHz suggestive of auroral hiss. While the inner edge of the new radiation belt formed near L = 2, analysis of VLF data indicate that chorus was primarily confined outside L ≈ 2.75. Copyright 2005 by the American Geophysical Union.