Global ENA observations of the storm mainphase ring current: Implications for skewed electric fields in the inner magnetosphere

Brandt, P. C.; Ohtani, S.; Mitchell, D. G.; Fok, M.‐C.; Roelof, E. C.; Demajistre, R.

doi:10.1029/2002gl015160

Cited by 118 publications

(163 citation statements)

References 13 publications

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“…Accordingly, ENA intensities are drastically enhanced during 2005-2036 UT [Brandt et al, 2002;Fok et al, 2003] in the nightside but ceased by 2259 UT. This is a general consequence of the southward IMF due to enhanced convection.…”

Section: Image Observationsmentioning

confidence: 99%

“…This means that the substantial destination of the plasma injection of <10 keV ions could be the morning sector. The preference for the postmidnight sector is stronger for lower-energy ions during large magnetic storms [e.g., Brandt et al, 2002;Ebihara and Fok, 2004].…”

Section: Image Observationsmentioning

confidence: 99%

“…[75] This scenario must assume a strong electric field [e.g., Brandt et al, 2002;Fok et al, 2003;Ebihara and Fok, 2004;Jordanova, 2005], and such a strong field is indeed inferred from the IMAGE/HENA data in Figure 7. The inferred electric field in the postmidnight sector for the 21 October 2001 event is strong enough to drive $10 keV ions quickly to the morning sector.…”

Section: Source Location and Mechanismmentioning

confidence: 99%

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Source location of the wedge‐like dispersed ring current in the morning sector during a substorm

et al. 2006

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[1] Source of wedge-like dispersed sub-keV ring current ions (wedge-like structure) is investigated using Cluster CIS data. Statistics from nearly 550 traversals show that the wedge-like structure with upper energy extending to ordinary energy of ring current is found mostly in the morning sector whereas those limited within sub-keV range are found mostly in the noon-to-afternoon sector. The former is most likely the original form of the latter. With this knowledge, the Cluster traversal on 21 October 2001 turned out to be a unique observation that reveals the formation of the wedge-like structure. Spacecraft 1 and 4 detected a wedge-like structure of 0.1 $ 10 keV protons at 2350 UT, while spacecraft 3 did not detect it 10 min before in the same magnetic flux tube. With the observed electric field of less than 3 mV/m, this fact indicates that the dispersion started within half an hour. Pitch angle distributions of the wedge-like structure is in most cases double conic-like butterfly distributions, but the wedge-like dispersed oxygen ions during the 21 October 2001 event flow mainly from one direction (from Northern Hemisphere) without a loss cone. With its characteristic energy of 0.05 $ 0.3 keV, these oxygen ions originate from the Northern Hemisphere about 20 $ 30 min before the observation. Both the dispersion analysis and the oxygen ion tracing suggest that the observed wedge-like structure is formed in the late morning sector during the latest substorm that started at 2310 UT. Possible mechanisms of the morning source are discussed.Citation: Yamauchi, M., et al. (2006), Source location of the wedge-like dispersed ring current in the morning sector during a substorm,

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Section: Image Observationsmentioning

confidence: 99%

Section: Image Observationsmentioning

confidence: 99%

Section: Source Location and Mechanismmentioning

confidence: 99%

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Source location of the wedge‐like dispersed ring current in the morning sector during a substorm

et al. 2006

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“…An MLT dependent part [Østgaard et al, 2003] is employed outside. The enhanced geocoronal hydrogen on the night side in this model was found in some cases to improve the results of ENA inversions [Brandt et al, 2002]. Zoennchen et al [2011] have developed a model of the hydrogen geocorona based on data from the TWINS LAD instrument during solar minimum.…”

Section: A2 Physicsmentioning

confidence: 99%

Evolution of CIR storm on 22 July 2009

et al. 2012

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[1] Global images of ion intensities are deconvolved from TWINS ENA images during the main and recovery phase of a CIR storm on 22 July 2009. The global spatial ion images taken at different times, along with solar wind data, geomagnetic activity indices, geosynchronous orbit observations, and in situ measurements from the THEMIS mission provide a picture of the evolution of the ring current during both the main phase and early recovery phase of the storm. Major features of the evolution are consistent with expectations based upon time dependent geomagnetic indices, e.g., SYM/H and ASY/H, and geosynchronous orbit detection of dipolarizations from GOES 11 and 12. Direct comparisons are made with in situ THEMIS ESA and SST spectral measurements. The peak energy of the ion spectrum in the ring current is seen to decrease in the recovery phase. The time evolution of the ion energy spectra over the range from 2.5 to 97.5 keV at the spatial peaks of the ring current in the inner magnetosphere obtained from ENA images is presented for the first time.

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“…Global images of ion injections into the ring current obtained with the use of neutral particle imaging techniques by the HENA instrument on the IMAGE spacecraft (e.g., Roelof et al 1985;Henderson et al 1997;Barabash et al 1997;Mitchell et al 2001Mitchell et al , 2003Brandt et al 2002) show the highly dynamic nature of ion injections and the population changes during a geomagnetic storm.…”

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confidence: 99%

Radiation Belt Storm Probes Ion Composition Experiment (RBSPICE)

et al. 2013

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The Radiation Belt Storm Probes Ion Composition Experiment (RBSPICE) on the two Van Allen Probes spacecraft is the magnetosphere ring current instrument that will provide data for answering the three over-arching questions for the Van Allen Probes Program: RBSPICE will determine "how space weather creates the storm-time ring current around Earth, how that ring current supplies and supports the creation of the radiation belt populations," and how the ring current is involved in radiation belt losses. RBSPICE is a time-of-flight versus total energy instrument that measures ions over the energy range from ∼20 keV to ∼1 MeV. RBSPICE will also measure electrons over the energy range ∼25 keV to ∼1 MeV in order to provide instrument background information in the radiation belts. A description of the instrument and its data products are provided in this chapter.

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Global ENA observations of the storm mainphase ring current: Implications for skewed electric fields in the inner magnetosphere

Cited by 118 publications

References 13 publications

Source location of the wedge‐like dispersed ring current in the morning sector during a substorm

Source location of the wedge‐like dispersed ring current in the morning sector during a substorm

Evolution of CIR storm on 22 July 2009

Radiation Belt Storm Probes Ion Composition Experiment (RBSPICE)

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