The ion cyclotron resonator in the magnetosphere

Recent progress in understanding Pc1 pearl formation

“…Guglielmi et al (2001) propose another mechanism for a decrease in the occurrence rate of groundbased observations of Pc1 events during the solar maximum (by almost an order of magnitude). They attribute it to the variation in the Q-factor of magnetospheric ion-cyclotron resonator which can exist due to reflection of EMIC waves from heavyion gyroresonance regions (Guglielmi et al, 2000). According to this idea, an increase in the heavy-ion abundance in the magnetosphere during solar maximum leads to a decreased leakage of Pc1 waves from the resonator, which makes them undetectable on the ground.…”

Parallel structure of Pc1 ULF oscillations in multi-ion magnetospheric plasma at finite ion gyrofrequency

“…It is instructive to compare the results of this paper with the results of Guglielmi et al (2000Guglielmi et al ( , 2001, Guglielmi and Kangas (2007), Guglielmi (2007), Lundin and Guglielmi (2006). In contrast to the Eqs.…”

“…(11) in Guglielmi et al, 2000). That is, the resonator is slightly wider in the quasi-parallel case.…”

“…Yet another interpretation was proposed in Guglielmi et al (2000Guglielmi et al ( , 2001, Guglielmi and Kangas (2007), Guglielmi (2007), Lundin and Guglielmi (2006). Following earlier ideas of Ginzburg (1963) and Guglielmi (1967), those authors included in the general picture the heavy ions abundant in the terrestrial magnetosphere; for example, the oxygen ions are sometimes as abundant as protons (Yang et al, 2010).…”

“…According to the standard model, the pearls are the Alfvé n wave packets generated by energetic ions and bouncing along a field line between magnetically conjugate points of the ionosphere (e.g., Guglielmi and Pokhotelov, 1996;Demekhov, 2007). However, some recent studies have thrown doubt on this interpretation (Mursula et al, 1997(Mursula et al, , 2001Mursula, 2007).…”