Cusp energetic particles observed by INTERBALL-tail probe in 1996

Pissarenko, N. F.; Kirpichev, I. P.; Lutsenko, V. N.; Savin, S.; Budnick, E.; Moszhukina, A.R.; Morozova, E. I.; Antonova, A.E.; Sandahl, I.

doi:10.1016/s1464-1917(00)00115-x

Cited by 11 publications

(15 citation statements)

References 18 publications

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“…These two predictions have been confirmed by both the POLAR Fritz, 2000, 2002b) and the CLUSTER observations (Figures 3 and 4). Local acceleration signatures in the cusps have also reported by other research groups (Kremser et al, 1995;Pfaff et al, 1998;Pissarenko et al, 2001;Yamauchi et al, 2001;Savin et al, 2002).…”

Section: Discussionsupporting

confidence: 77%

“…further found that the integrated power of the cusp turbulent magnetic spectra over the ULF ranges is correlated with the intensity of the cusp MeV helium flux and suggested a resonant acceleration mechanism to energize these cusp charged particles. Some research groups have also reported particle acceleration signatures locally in the cusps (Kremser et al, 1995;Pfaff et al, 1998;Pissarenko et al, 2001;Yamauchi et al, 2001;Savin et al, 2002). On the other hand, through numerical simulations, Delcourt and Sauvaud (1999), Blake (1999), and Antonova et al (2000) suggested a ring current source of the CEPs.…”

Section: Introductionmentioning

confidence: 97%

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High-Altitude CUSP: The Extremely Dynamic Region in Geospace

Chen

Fritz

2005

Surv Geophys

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The high-altitude dayside cusps (both northern and southern) are extremely dynamic regions in geospace. Large diamagnetic cavities with significant fluctuations of the local magnetic field strength have been observed there. These cusp diamagnetic cavities are always there day after day and are as large as 6 R E . Associated with these cavities are charged particles with energies from 20 keV up to 10 MeV. The intensities of the cusp energetic ions have been observed to increase by as much as four orders of the magnitude when compared with regions adjacent to the cusp which includes the magnetosheath. Their seed populations are a mixture of ionospheric and solar wind particles. The measured energetic ion fluxes in the high-altitude cusp are higher than that in both the regions upstream and downstream from the bow shock. Turbulent electric fields with an amplitude of about 10 mV/m are also present in the cusp, and a cusp resonant acceleration mechanism is suggested. The observations indicate that the dayside high-altitude cusp is a key region for transferring the solar wind mass, momentum, and energy into the Earth's magnetosphere.

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Section: Discussionsupporting

confidence: 77%

Section: Introductionmentioning

confidence: 97%

High-Altitude CUSP: The Extremely Dynamic Region in Geospace

Chen

Fritz

2005

Surv Geophys

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“…According to their analysis, the peak in the observed phase space density (or flux) at that location suggested both that the particles were being accelerated in situ and that they were a potential source population for diffusion into the radiation belts. Chen et al (1998);Chen and Fritz (1998a) also showed that the intensity of energetic particle flux was correlated with enhancement in low-frequency wave turbulence something which was also reported by Pissarenko et al (2001). Additionally, Fritz et al (2003) by comparing the time-intensity profiles of O ≤+2 and He ++ ions pointed out that since the seed population of the cusp energetic O ≤+2 is of ionospheric origin, and since the seed population of the cusp energetic He ++ is solar wind plasma, the similarity of their profiles suggests that both seed populations are energized by a common acceleration mechanism active in the polar cusp.…”

Section: Introductionsupporting

confidence: 66%

Cluster observations of particle acceleration up to supra-thermal energies in the cusp region related to low-frequency wave activity – possible implications for the substorm initiation process

Vogiatzis

Sarris

et al. 2008

Ann. Geophys.

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Abstract. The purpose of our study is to investigate the way particles are accelerated up to supra-thermal energies in the cusp diamagnetic cavities. For this reason we have examined a number of Cluster cusp crossings, originally identified by Zhang et al. (2005), for the years 2001 and 2002 using data from RAPID, STAFF, EFW, CIS, PEACE, and FGM experiments. In the present study we focus on two particular cusp crossings on 25 March 2002 and on 10 April 2002 which demonstrate in a clear way the general characteristics of the events in our survey. Both events exhibit very sharp spatial boundaries seen both in CNO (primarily single-charged oxygen of ionospheric origin based on CIS observations) and H + flux increases within the RAPID energy range with the magnetic field intensity being anti-correlated. Unlike the first event, the second one shows also a moderate electron flux increase. The fact that the duskward electric field E y has relatively low values <5 mV/m while the local wave activity is very intense provides a strong indication that particle energization is caused primarily by wave-particle interactions. The wave power spectra and propagation parameters during these cusp events are examined in detail. It is concluded that the high ion fluxes and at the same time the presence or absence of any sign of energization in the electrons clearly shows that the particle acceleration depends on the wave power near the local particle gyrofrequency and on the persistence of the wave-particle interaction process before parCorrespondence to: I. I. Vogiatzis (ivogiatz@ee.duth.gr) ticles escape from cusp region. Furthermore, the continuous existence of energetic O + ions suggests that energetic O + populations are of spatial nature at least for the eight events that we have studied so far.

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“…One of the recent discoveries made by the Polar, Interball 1 and Magion 4 satellites in the polar cusp is the presence of high energy ions and elec- trons in this region (Chen et al, 1998;Pisarenko et al, 2001). Strong plasma wave emissions are associated with these particles Pickett et al, 1999).…”

Section: Energetic Electrons In the Polar Cuspmentioning

confidence: 99%

Low-Frequency Plasma Waves in the Outer Polar CUSP: A Review of Observations from Prognoz 8, Interball 1, Magion 4, and Cluster

et al. 2005

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This paper presents a review of the most interesting observations of low-frequency plasma waves together with plasma particles which were made by the Interball 1, Magion 4 and Prognoz 8 satellites in the outer polar cusp. Accelerated plasma particles, hot electron populations and very strong wave activity, particularly at low frequencies, are observed. A detailed study of the wave spectra together with the distribution function for electrons indicate the correlation between the presence of lower-hybrid waves and the population of the particles with higher energy than in the surrounding space. These experimental facts suggest that strong coupling between waves and particles is responsible for plasma heating. During polar cusp crossings by Interball 1 and Prognoz 8, FFT analysis of the wave form indicates many bursts of ULF emissions in both electric and magnetic components. These waves have highly nonstationary characteristics. To study the dynamics of changes in the spectral characteristics of the waves wavelet analysis has been used. Nonlinear interactions are studied using bispectral methods of analysis. This presentation gives the results of such an analysis for selected cusp crossings at different altitudes. An example of wave activity registered by the STAFF instrument onboard the CLUSTER spacecraft in the polar cusp is also presented.

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Cusp energetic particles observed by INTERBALL-tail probe in 1996

Cited by 11 publications

References 18 publications

High-Altitude CUSP: The Extremely Dynamic Region in Geospace

High-Altitude CUSP: The Extremely Dynamic Region in Geospace

Cluster observations of particle acceleration up to supra-thermal energies in the cusp region related to low-frequency wave activity – possible implications for the substorm initiation process

Low-Frequency Plasma Waves in the Outer Polar CUSP: A Review of Observations from Prognoz 8, Interball 1, Magion 4, and Cluster

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