Ion Injection Triggered EMIC Waves in the Earth's Magnetosphere. Issue 6 (22nd June 2018)
- Record Type:
- Journal Article
- Title:
- Ion Injection Triggered EMIC Waves in the Earth's Magnetosphere. Issue 6 (22nd June 2018)
- Main Title:
- Ion Injection Triggered EMIC Waves in the Earth's Magnetosphere
- Authors:
- Remya, B.
Sibeck, D. G.
Halford, A. J.
Murphy, K. R.
Reeves, G. D.
Singer, H. J.
Wygant, J. R.
Farinas Perez, G.
Thaller, S. A. - Abstract:
- Abstract: We present Van Allen Probe observations of electromagnetic ion cyclotron (EMIC) waves triggered solely due to individual substorm‐injected ions in the absence of storms or compressions of the magnetosphere during 9 August 2015. The time at which the injected ions are observed directly corresponds to the onset of EMIC waves at the location of Van Allen Probe A ( L = 5.5 and 18:06 magnetic local time). The injection was also seen at geosynchronous orbit by the Geostationary Operational Environmental Satellite and Los Alamos National Laboratory spacecraft, and the westward(eastward) drift of ions(electrons) was monitored by Los Alamos National Laboratory spacecraft at different local times. The azimuthal location of the injection was determined by tracing the injection signatures backward in time to their origin assuming a dipolar magnetic field of Earth. The center of this injection location was determined to be close to ∼20:00 magnetic local time. Geostationary Operational Environmental Satellite and ground magnetometer responses confirm substorm onset at approximately the same local time. The observed EMIC wave onsets at Van Allen Probe were also associated with a magnetic field decrease. The arrival of anisotropic ions along with the decrease in the magnetic field favors the growth of the EMIC wave instability based on linear theory analysis. Key Points: Substorm ion injections can trigger EMIC waves; a decrease in the magnetic field magnitude is associated withAbstract: We present Van Allen Probe observations of electromagnetic ion cyclotron (EMIC) waves triggered solely due to individual substorm‐injected ions in the absence of storms or compressions of the magnetosphere during 9 August 2015. The time at which the injected ions are observed directly corresponds to the onset of EMIC waves at the location of Van Allen Probe A ( L = 5.5 and 18:06 magnetic local time). The injection was also seen at geosynchronous orbit by the Geostationary Operational Environmental Satellite and Los Alamos National Laboratory spacecraft, and the westward(eastward) drift of ions(electrons) was monitored by Los Alamos National Laboratory spacecraft at different local times. The azimuthal location of the injection was determined by tracing the injection signatures backward in time to their origin assuming a dipolar magnetic field of Earth. The center of this injection location was determined to be close to ∼20:00 magnetic local time. Geostationary Operational Environmental Satellite and ground magnetometer responses confirm substorm onset at approximately the same local time. The observed EMIC wave onsets at Van Allen Probe were also associated with a magnetic field decrease. The arrival of anisotropic ions along with the decrease in the magnetic field favors the growth of the EMIC wave instability based on linear theory analysis. Key Points: Substorm ion injections can trigger EMIC waves; a decrease in the magnetic field magnitude is associated with the arrival of injected ions Injection signatures are observed at GOES, Van Allen Probe A, and LANL spacecraft; energy and pitch angle dispersion are observed by Van Allen Probe Drift paths of injected ions/electrons from various LANL spacecraft are traced back to find their injection location at 20:00 MLT … (more)
- Is Part Of:
- Journal of geophysical research. Volume 123:Issue 6(2018)
- Journal:
- Journal of geophysical research
- Issue:
- Volume 123:Issue 6(2018)
- Issue Display:
- Volume 123, Issue 6 (2018)
- Year:
- 2018
- Volume:
- 123
- Issue:
- 6
- Issue Sort Value:
- 2018-0123-0006-0000
- Page Start:
- 4921
- Page End:
- 4938
- Publication Date:
- 2018-06-22
- Subjects:
- substorm -- EMIC waves -- magnetic dip -- ion injections -- Van Allen Probes
Magnetospheric physics -- Periodicals
Space environment -- Periodicals
Cosmic physics -- Periodicals
Planets -- Atmospheres -- Periodicals
Heliosphere (Astrophysics) -- Periodicals
Geophysics -- Periodicals
523.01 - Journal URLs:
- http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)2169-9402 ↗
http://onlinelibrary.wiley.com/ ↗ - DOI:
- 10.1029/2018JA025354 ↗
- Languages:
- English
- ISSNs:
- 2169-9380
- Deposit Type:
- Legaldeposit
- View Content:
- Available online (eLD content is only available in our Reading Rooms) ↗
- Physical Locations:
- British Library DSC - 4995.010000
British Library DSC - BLDSS-3PM
British Library HMNTS - ELD Digital store - Ingest File:
- 11523.xml