Details

Autor(en) / Beteiligte

• Gkioulidou, Matina
• Ohtani, S.
• Mitchell, D. G.
• Ukhorskiy, A. Y.
• Reeves, G. D.
• Turner, D. L.
• Gjerloev, J. W.
• Nosé, M.
• Koga, K.
• Rodriguez, J. V.
• Lanzerotti, L. J.

Titel

Spatial structure and temporal evolution of energetic particle injections in the inner magnetosphere during the 14 July 2013 substorm event

Ist Teil von

• Journal of geophysical research. Space physics, 2015-03, Vol.120 (3), p.1924-1938

Ort / Verlag

Washington: Blackwell Publishing Ltd

Erscheinungsjahr

2015

Quelle

Wiley Online Library - AutoHoldings Journals

Beschreibungen/Notizen

• Recent results by the Van Allen Probes mission showed that the occurrence of energetic ion injections inside geosynchronous orbit could be very frequent throughout the main phase of a geomagnetic storm. Understanding, therefore, the formation and evolution of energetic particle injections is critical in order to quantify their effect in the inner magnetosphere. We present a case study of a substorm event that occurred during a weak storm (Dst ~ −40 nT) on 14 July 2013. Van Allen Probe B, inside geosynchronous orbit, observed two energetic proton injections within 10 min, with different dipolarization signatures and duration. The first one is a dispersionless, short‐timescale injection pulse accompanied by a sharp dipolarization signature, while the second one is a dispersed, longer‐timescale injection pulse accompanied by a gradual dipolarization signature. We combined ground magnetometer data from various stations and in situ particle and magnetic field data from multiple satellites in the inner magnetosphere and near‐Earth plasma sheet to determine the spatial extent of these injections, their temporal evolution, and their effects in the inner magnetosphere. Our results indicate that there are different spatial and temporal scales at which injections can occur in the inner magnetosphere and depict the necessity of multipoint observations of both particle and magnetic field data in order to determine these scales. Key Points Two injections were observed inside GEO during a substorm event Spatial and temporal structure is estimated combining multipoint observations Injections inside GEO can occur at different spatial and temporal scales