Abstract
A statistical study of field-aligned electron beams associated with ion conics events
Highlights
There have been several reports on ®eld-aligned electron beams over the auroral region. Sharp et al (1980) and Lin et al (1982) reported counterstreaming electronCorrespondence to: W
Various processes ranging from acceleration by a static electric ®eld to energization by waves have been proposed as a cause of perpendicular acceleration of ions
Ion conics have a good correlation with ®eld-aligned electron beams, but ion beams do not
Summary
There have been several reports on ®eld-aligned electron beams over the auroral region. Sharp et al (1980) and Lin et al (1982) reported counterstreaming electron. The simple explanation for the generation is that they are the result of perpendicular acceleration of ions at low altitudes and the subsequent upward motion of the accelerated ions in the earth's mirror magnetic ®eld conserving the ®rst adiabatic invariant Another type of ion conic is called an elevated (or bi-modal) conic (Klumpar et al, 1984). Thelin and Lundin (1990) made a statistical study of the distributions in MLT, Inv. lat., and altitude of ®eld-aligned upowing electrons and upowing ions from Viking observations They found a correlation between ion conics and electron beams in the distributions in magnetic local time, invariant latitude, and altitude, and suggested that ion conics and electron beams emanate from the same physical process. The purpose of our study here is to obtain more detailed relations between the ®eld-aligned electrons and the ion conics through a statistical analysis
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