CRRES magnetic electron spectrometer AFGL-701-5A (MEA)

Vampola, A. L.; Osborn, J.V.; Johnson, B.M.

doi:10.2514/3.25504

Cited by 79 publications

(64 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The actual current system configuration that can give rise to such strongly tail-like conditions as were observed near 5.5-6.5 MLT (see Figure 5) and 17. [8][9][10][11][12][13][14][15][16][17][18][19].0 MLT (see Figure 2) is not clear, and its details require more observational constraints than are provided by a single satellite measurement.…”

Section: Discussionmentioning

confidence: 99%

CRRES observations of particle flux dropout events

Fennell

Roeder

Singer

et al. 1996

Advances in Space Research

View full text Add to dashboard Cite

The complete disappearance of energetic electrons was observed by CRRES in the near geosynchronous region in 7.5% of the orbits examined. These total flux dropouts were defined by the fluxes rapidly dropping to levels below the sensitivity of the MEA energetic electron spectrometer on the CRRES satellite. They were separated into those that were only energetic electron dropouts and those that were associated with energetic ion and plasma dropouts. Approximately 20% of the events showed dropouts of all particle fluxes, and these were usually coincident with large increases in the local magnetic intensity and signatures of strong current systems. The energetic particle instruments and magnetometer on CRRES provide a detailed picture of the particle and field responses to these unusual conditions. Both the local morning and dusk events were associated with strong azimuthal (eastward) and radial changes in the magnetic field indicative of a strong current system approaching and sometimes crossing the CRRES position at the time of the flux dropouts. The direction of the field changes and the details of particle observations are consistent with CRRES passing through the plasma sheet boundary layer and entering the tail lobe for a significant number of the events.

show abstract

Section: Discussionmentioning

confidence: 99%

CRRES observations of particle flux dropout events

Fennell

Roeder

Singer

et al. 1996

Advances in Space Research

View full text Add to dashboard Cite

show abstract

“…The imprint of the coherent ULF wave can be seen globally throughout the electron radiation belt in the omni-directional flux from the SOPA instrument on two Los Alamos (LANL) geosynchronous satellites 19 , and differential flux from the MEA 20 (Medium Energy-A electron spectrometer) instrument on the CRRES 21 in-bound in the midnight-dusk local time sector ( Fig. 1).…”

Section: Crres Observations and Modellingmentioning

confidence: 99%

Discovery of the action of a geophysical synchrotron in the Earth’s Van Allen radiation belts

et al. 2013

View full text Add to dashboard Cite

Although the Earth's Van Allen radiation belts were discovered over 50 years ago, the dominant processes responsible for relativistic electron acceleration, transport and loss remain poorly understood. Here we show evidence for the action of coherent acceleration due to resonance with ultra-low frequency waves on a planetary scale. Data from the CRRES probe, and from the recently launched multi-satellite NASA Van Allen Probes mission, with supporting modelling, collectively show coherent ultra-low frequency interactions which high energy resolution data reveals are far more common than either previously thought or observed. The observed modulations and energy-dependent spatial structure indicate a mode of action analogous to a geophysical synchrotron; this new mode of response represents a significant shift in known Van Allen radiation belt dynamics and structure. These periodic collisionless betatron acceleration processes also have applications in understanding the dynamics of, and periodic electromagnetic emissions from, distant plasma-astrophysical systems.

show abstract

“…With an orbital period of ∼10 h, the CRRES satellite covered a range of L-shell from 1.05 to 8 and swept through the heart of the radiation belts every half orbit. The MEA instrument aboard the satellite measured pitch angle resolved electron differential fluxes in 17 energy channels, covering an energy range from 153 to 1582 keV [Vampola et al, 1992]. The low inclination of CRRES allowed the MEA instrument to observe the electron PADs with good positions near the equatorial region.…”

Section: Gu Et Al: Radiation Belt Energetic Electron Pad A01208 A01208mentioning

confidence: 99%

“…Thus, a first-order polynomial fit can be applied to quantify the values of C and n. Since the flux observations, if small, could be contaminated or even dominated by the background noise, we set the flux Figure 5. Averaged n-values as a function of electron kinetic energy for six representative MLT sectors of 0000-0400, 0400-0800, 0800-1200, 1200-1600, 1600-2000, and 2000-2400 under different geomagnetic activity levels at the spatial location of L = 6.0 ± 0.1. threshold value as 10 0.5 cm −2 sec −1 sr −1 keV −1 [Vampola et al, 1992] and remove the measurements with values lower than it. To assure that sufficient flux versus pitch angle points are employed for reliable fitting, we further exclude the data with the number of useful points less than 3 for one energy channel.…”

Section: Gu Et Al: Radiation Belt Energetic Electron Pad A01208 A01208mentioning

confidence: 99%

Statistical analysis of pitch angle distribution of radiation belt energetic electrons near the geostationary orbit: CRRES observations

Zhao

et al. 2011

J. Geophys. Res.

View full text Add to dashboard Cite

CRRES magnetic electron spectrometer AFGL-701-5A (MEA)

Cited by 79 publications

References 1 publication

CRRES observations of particle flux dropout events

CRRES observations of particle flux dropout events

Discovery of the action of a geophysical synchrotron in the Earth’s Van Allen radiation belts

Statistical analysis of pitch angle distribution of radiation belt energetic electrons near the geostationary orbit: CRRES observations

Contact Info

Product

Resources

About