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Full-Text Articles in Physics
Mev Magnetosheath Ions Energized At The Bow Shock, S. Chang, J. D. Scudder, K. Kudela, Harlan E. Spence, J. F. Fennell, R. P. Lepping, R. P. Lin, C. T. Russell
Mev Magnetosheath Ions Energized At The Bow Shock, S. Chang, J. D. Scudder, K. Kudela, Harlan E. Spence, J. F. Fennell, R. P. Lepping, R. P. Lin, C. T. Russell
Physics & Astronomy
A causal relationship between midlatitude magnetosheath energetic ions and bow shock magnetic geometry was previously established for ion energy up to 200 keV e−1 for the May 4, 1998, storm event. This study demonstrates that magnetosheath ions with energies above 200 keV up to 1 MeV simply extend the ion spectrum to form a power law tail. Results of cross-correlation analysis suggest that these ions also come directly from the quasi-parallel bow shock, not the magnetosphere. This is confirmed by a comparison of energetic ion fluxes simultaneously measured in the magnetosheath and at the quasi-parallel bow shock when both regions …
Charge Exchange Contribution To The Decay Of The Ring Current, Measured By Energetic Neutral Atoms (Enas), A. M. Jorgensen, M. G. Henderson, E. C. Roelof, G. D. Reeves, Harlan E. Spence
Charge Exchange Contribution To The Decay Of The Ring Current, Measured By Energetic Neutral Atoms (Enas), A. M. Jorgensen, M. G. Henderson, E. C. Roelof, G. D. Reeves, Harlan E. Spence
Physics & Astronomy
In this paper we calculate the contribution of charge exchange to the decay of the ring current. Past works have suggested that charge exchange of ring current protons is primarily responsible for the decay of the ring current during the late recovery phase, but there is still much debate about the fast decay of the early recovery phase. We use energetic neutral atom (ENA) measurements from Polar to calculate the total ENA energy escape. To get the total ENA escape we apply a forward modeling technique, and to estimate the total ring current energy escape we use the Dessler-Parker-Sckopke relationship. …
Investigation Of Magnetopause Reconnection Models Using Two Colocated, Low‐Altitude Satellites: A Unifying Reconnection Geometry, A. Boudouridis, Harlan E. Spence, T. G. Onsager
Investigation Of Magnetopause Reconnection Models Using Two Colocated, Low‐Altitude Satellites: A Unifying Reconnection Geometry, A. Boudouridis, Harlan E. Spence, T. G. Onsager
Physics & Astronomy
Ion precipitation data from two co-orbiting Defense Meteorological Satellite Program satellites (F6 and F8) are used to investigate magnetopause reconnection models. We examine differential fluxes between 30 eV and 30 keV, from a Southern Hemisphere, prenoon pass during the morning of January 10, 1990. Data from the first satellite to pass through the region (F6) show two distinct ion energy dispersions •-1 ø of latitude apart, between 76 ø and 79 ø magnetic latitude. The electron data exhibit similar features at around the same region but with no or little energy dispersion, consistent with their high velocities. We suggest that …