The hidden dynamics of relativistic electrons (0.7-1.5 MeV) in the inner zone and slot region
Abstract
We present measurements of relativistic electrons (0.7–1.5 MeV) in the inner zone and slot region obtained by the Magnetic Electron and Ion Spectrometer (MagEIS) instrument on Van Allen Probes. The data presented are corrected for background contamination, which is primarily due to inner-belt protons in these low-L regions. We find that ~1 MeV electrons were transported into the inner zone following the two largest geomagnetic storms of the Van Allen Probes era to date, the March and June 2015 events. As ~1 MeV electrons were not observed in Van Allen Probes data in the inner zone prior to these two events, the injections created a new inner belt that persisted for at least 1.5 years. In contrast, we find that electrons injected into the slot region decay on much faster timescales, approximately tens of days. Furthermore, we find no evidence of >1.5 MeV electrons in the inner zone during the entire time interval considered (April 2013 through September 2016). The energies we examine thus span a transition range in the steeply falling inner zone electron spectrum, where modest intensities are observed at 0.7 MeV, and no electrons are observed at 1.5 MeV. To validate the results obtained from the backgroundmore »
- Authors:
-
- The Aerospace Corp., El Segundo, CA (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Univ. of New Hampshire, Durham, NH (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- National Aeronautics and Space Administration (NASA); USDOE
- OSTI Identifier:
- 1351198
- Report Number(s):
- LA-UR-17-20109
Journal ID: ISSN 2169-9380
- Grant/Contract Number:
- AC52-06NA25396
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Geophysical Research. Space Physics
- Additional Journal Information:
- Journal Volume: 122; Journal Issue: 3; Journal ID: ISSN 2169-9380
- Publisher:
- American Geophysical Union
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 58 GEOSCIENCES; Heliospheric and Magnetospheric Physics
Citation Formats
Claudepierre, Seth G., O'Brien, T. P., Fennell, J. F., Blake, J. B., Clemmons, J. H., Looper, M. D., Mazur, J. E., Roeder, J. L., Turner, D. L., Reeves, Geoffrey D., and Spence, H. E. The hidden dynamics of relativistic electrons (0.7-1.5 MeV) in the inner zone and slot region. United States: N. p., 2017.
Web. doi:10.1002/2016JA023719.
Claudepierre, Seth G., O'Brien, T. P., Fennell, J. F., Blake, J. B., Clemmons, J. H., Looper, M. D., Mazur, J. E., Roeder, J. L., Turner, D. L., Reeves, Geoffrey D., & Spence, H. E. The hidden dynamics of relativistic electrons (0.7-1.5 MeV) in the inner zone and slot region. United States. https://doi.org/10.1002/2016JA023719
Claudepierre, Seth G., O'Brien, T. P., Fennell, J. F., Blake, J. B., Clemmons, J. H., Looper, M. D., Mazur, J. E., Roeder, J. L., Turner, D. L., Reeves, Geoffrey D., and Spence, H. E. Wed .
"The hidden dynamics of relativistic electrons (0.7-1.5 MeV) in the inner zone and slot region". United States. https://doi.org/10.1002/2016JA023719. https://www.osti.gov/servlets/purl/1351198.
@article{osti_1351198,
title = {The hidden dynamics of relativistic electrons (0.7-1.5 MeV) in the inner zone and slot region},
author = {Claudepierre, Seth G. and O'Brien, T. P. and Fennell, J. F. and Blake, J. B. and Clemmons, J. H. and Looper, M. D. and Mazur, J. E. and Roeder, J. L. and Turner, D. L. and Reeves, Geoffrey D. and Spence, H. E.},
abstractNote = {We present measurements of relativistic electrons (0.7–1.5 MeV) in the inner zone and slot region obtained by the Magnetic Electron and Ion Spectrometer (MagEIS) instrument on Van Allen Probes. The data presented are corrected for background contamination, which is primarily due to inner-belt protons in these low-L regions. We find that ~1 MeV electrons were transported into the inner zone following the two largest geomagnetic storms of the Van Allen Probes era to date, the March and June 2015 events. As ~1 MeV electrons were not observed in Van Allen Probes data in the inner zone prior to these two events, the injections created a new inner belt that persisted for at least 1.5 years. In contrast, we find that electrons injected into the slot region decay on much faster timescales, approximately tens of days. Furthermore, we find no evidence of >1.5 MeV electrons in the inner zone during the entire time interval considered (April 2013 through September 2016). The energies we examine thus span a transition range in the steeply falling inner zone electron spectrum, where modest intensities are observed at 0.7 MeV, and no electrons are observed at 1.5 MeV. To validate the results obtained from the background corrected flux measurements, we also present detailed pulse-height spectra from individual MagEIS detectors. These measurements confirm our results and also reveal low-intensity inner zone and slot region electrons that are not captured in the standard background corrected data product. Lastly, we briefly discuss efforts to refine the upper limit of inner zone MeV electron flux obtained in earlier work.},
doi = {10.1002/2016JA023719},
journal = {Journal of Geophysical Research. Space Physics},
number = 3,
volume = 122,
place = {United States},
year = {Wed Mar 15 00:00:00 EDT 2017},
month = {Wed Mar 15 00:00:00 EDT 2017}
}
Web of Science
Works referenced in this record:
Energetic, relativistic, and ultrarelativistic electrons: Comparison of long-term VERB code simulations with Van Allen Probes measurements: LONG-TERM VERB CODE SIMULATIONS
journal, May 2015
- Drozdov, A. Y.; Shprits, Y. Y.; Orlova, K. G.
- Journal of Geophysical Research: Space Physics, Vol. 120, Issue 5
Upper limit on the inner radiation belt MeV electron intensity
journal, February 2015
- Li, X.; Selesnick, R. S.; Baker, D. N.
- Journal of Geophysical Research: Space Physics, Vol. 120, Issue 2
Inner-zone energetic-electron repopulation by radial diffusion
journal, July 1972
- Tomassian, Albert D.; Farley, Thomas A.; Vampola, Alfred L.
- Journal of Geophysical Research, Vol. 77, Issue 19
Radial diffusion coefficient for electrons at 1.76 < L < 5
journal, December 1968
- Newkirk, L. L.; Walt, M.
- Journal of Geophysical Research, Vol. 73, Issue 23
Control of the innermost electron radiation belt by large‐scale electric fields
journal, September 2016
- Selesnick, R. S.; Su, Y. ‐J.; Blake, J. B.
- Journal of Geophysical Research: Space Physics, Vol. 121, Issue 9
Energy-dependent dynamics of keV to MeV electrons in the inner zone, outer zone, and slot regions: ENERGY-DEPENDENT RADIATION BELT DYNAMICS
journal, January 2016
- Reeves, Geoffrey D.; Friedel, Reiner H. W.; Larsen, Brian A.
- Journal of Geophysical Research: Space Physics, Vol. 121, Issue 1
Injection of electrons and protons with energies of tens of MeV into L < 3 on 24 March 1991
journal, April 1992
- Blake, J. B.; Kolasinski, W. A.; Fillius, R. W.
- Geophysical Research Letters, Vol. 19, Issue 8
Van Allen Probes show that the inner radiation zone contains no MeV electrons: ECT/MagEIS data
journal, March 2015
- Fennell, J. F.; Claudepierre, S. G.; Blake, J. B.
- Geophysical Research Letters, Vol. 42, Issue 5
The Magnetic Electron Ion Spectrometer (MagEIS) Instruments Aboard the Radiation Belt Storm Probes (RBSP) Spacecraft
journal, June 2013
- Blake, J. B.; Carranza, P. A.; Claudepierre, S. G.
- Space Science Reviews, Vol. 179, Issue 1-4
Measurement of inner radiation belt electrons with kinetic energy above 1 MeV: INNER BELT ELECTRONS
journal, October 2015
- Selesnick, R. S.
- Journal of Geophysical Research: Space Physics, Vol. 120, Issue 10
Energetic electron injections deep into the inner magnetosphere associated with substorm activity: Energetic particle injections at low L
journal, April 2015
- Turner, D. L.; Claudepierre, S. G.; Fennell, J. F.
- Geophysical Research Letters, Vol. 42, Issue 7
Time history of the inner radiation zone, October 1963 to December 1968
journal, March 1970
- Bostrom, C. O.; Beall, D. S.; Armstrong, J. C.
- Journal of Geophysical Research, Vol. 75, Issue 7
Inner zone and slot electron radial diffusion revisited: INNER ZONE ELECTRON DLL UPDATE
journal, July 2016
- O'Brien, T. P.; Claudepierre, S. G.; Guild, T. B.
- Geophysical Research Letters, Vol. 43, Issue 14
A study of electron spectra in the inner belt
journal, September 1976
- West, H. I.; Buck, R. M.
- Journal of Geophysical Research, Vol. 81, Issue 25
An extreme distortion of the Van Allen belt arising from the ‘Hallowe'en’ solar storm in 2003
journal, December 2004
- Baker, D. N.; Kanekal, S. G.; Li, X.
- Nature, Vol. 432, Issue 7019
Loss and replenishment of electrons in the inner radiation zone during 1965-1967
journal, January 1971
- Rosen, Alan; Sanders, N. L.
- Journal of Geophysical Research, Vol. 76, Issue 1
High-energy radiation belt electrons from CRAND
journal, April 2015
- Selesnick, R. S.
- Journal of Geophysical Research: Space Physics, Vol. 120, Issue 4
Radial diffusion coefficient for electrons at low L values
journal, February 1968
- Newkirk, L. L.; Walt, M.
- Journal of Geophysical Research, Vol. 73, Issue 3
Response of the inner radiation belt to the violent Sun-Earth connection events of October–November 2003
journal, January 2005
- Looper, M. D.
- Geophysical Research Letters, Vol. 32, Issue 3
Highly relativistic radiation belt electron acceleration, transport, and loss: Large solar storm events of March and June 2015: HIGHLY RELATIVISTIC ELECTRON DYNAMICS
journal, July 2016
- Baker, D. N.; Jaynes, A. N.; Kanekal, S. G.
- Journal of Geophysical Research: Space Physics, Vol. 121, Issue 7
Equilibrium structure of radiation belt electrons
journal, May 1973
- Lyons, Lawrence R.; Thorne, Richard Mansergh
- Journal of Geophysical Research, Vol. 78, Issue 13
Radial diffusion of electrons at low L values
journal, January 1969
- Farley, Thomas A.
- Journal of Geophysical Research, Vol. 74, Issue 1
Particle Diffusion in the Radiation Belts
book, January 1974
- Schulz, Michael; Lanzerotti, Louis J.
- Physics and Chemistry in Space (book series)
Van Allen Probes observations of direct wave-particle interactions: WAVE-PARTICLE INTERACTIONS
journal, March 2014
- Fennell, J. F.; Roeder, J. L.; Kurth, W. S.
- Geophysical Research Letters, Vol. 41, Issue 6
Formation of the inner electron radiation belt by enhanced large‐scale electric fields
journal, September 2016
- Su, Yi‐Jiun; Selesnick, Richard S.; Blake, J. B.
- Journal of Geophysical Research: Space Physics, Vol. 121, Issue 9
Atmospheric scattering and decay of inner radiation belt electrons: INNER RADIATION BELT
journal, August 2012
- Selesnick, R. S.
- Journal of Geophysical Research: Space Physics, Vol. 117, Issue A8
Modeling energetic electron penetration into the slot region and inner radiation belt: ELECTRON PENETRATION INTO SLOT REGION
journal, November 2013
- Zhao, H.; Li, X.
- Journal of Geophysical Research: Space Physics, Vol. 118, Issue 11
Peculiar pitch angle distribution of relativistic electrons in the inner radiation belt and slot region
journal, April 2014
- Zhao, H.; Li, X.; Blake, J. B.
- Geophysical Research Letters, Vol. 41, Issue 7
Characteristics of pitch angle distributions of hundreds of keV electrons in the slot region and inner radiation belt
journal, December 2014
- Zhao, H.; Li, X.; Blake, J. B.
- Journal of Geophysical Research: Space Physics, Vol. 119, Issue 12
Quasi‐linear simulations of inner radiation belt electron pitch angle and energy distributions
journal, March 2016
- Albert, Jay M.; Starks, Michael J.; Horne, Richard B.
- Geophysical Research Letters, Vol. 43, Issue 6
A background correction algorithm for Van Allen Probes MagEIS electron flux measurements: MAGEIS BACKGROUND CORRECTION ALGORITHM
journal, July 2015
- Claudepierre, S. G.; O'Brien, T. P.; Blake, J. B.
- Journal of Geophysical Research: Space Physics, Vol. 120, Issue 7
Science Objectives and Rationale for the Radiation Belt Storm Probes Mission
journal, September 2012
- Mauk, B. H.; Fox, N. J.; Kanekal, S. G.
- Space Science Reviews, Vol. 179, Issue 1-4
Stochastic simulation of inner radiation belt electron decay by atmospheric scattering
journal, February 2016
- Selesnick, R. S.
- Journal of Geophysical Research: Space Physics, Vol. 121, Issue 2
The Magnetic Electron Ion Spectrometer (MagEIS) Instruments Aboard the Radiation Belt Storm Probes (RBSP) Spacecraft
journal, June 2013
- Blake, J. B.; Carranza, P. A.; Claudepierre, S. G.
- Space Science Reviews, Vol. 179, Issue 1-4
Science Objectives and Rationale for the Radiation Belt Storm Probes Mission
journal, September 2012
- Mauk, B. H.; Fox, N. J.; Kanekal, S. G.
- Space Science Reviews, Vol. 179, Issue 1-4
Works referencing / citing this record:
Empirical radiation belt models: Comparison with in situ data and implications for environment definition: Empirical Radiation Belt Models
journal, September 2017
- de Soria-Santacruz Pich, Maria; Jun, Insoo; Evans, Robin
- Space Weather, Vol. 15, Issue 9
Earth's Van Allen Radiation Belts: From Discovery to the Van Allen Probes Era
journal, November 2019
- Li, W.; Hudson, M. K.
- Journal of Geophysical Research: Space Physics, Vol. 124, Issue 11
Dynamics of Megaelectron Volt Electrons Observed in the Inner Belt by PROBA‐V/EPT
journal, March 2019
- Pierrard, V.; Lopez Rosson, G.; Botek, E.
- Journal of Geophysical Research: Space Physics, Vol. 124, Issue 3
Effects of VLF Transmitter Waves on the Inner Belt and Slot Region
journal, July 2019
- Ross, J. P. J.; Meredith, N. P.; Glauert, S. A.
- Journal of Geophysical Research: Space Physics, Vol. 124, Issue 7
Dynamics of Megaelectron Volt Electrons Observed in the Inner Belt by PROBA-V/EPT
text, January 2019
- Pierrard, Viviane; Rosson, Graciela Lopez; Botek, Edith
- arXiv