Ionospheric signatures of plasmaspheric tails by Foster, John C

Get full text

Storm time observations of plasmasphere erosion flux in the magnetosphere and ionosphere by Thaller, S., Tao, J., Wygant, J. R., Bonnell, J. W., Foster, John C, Erickson, Philip J, Coster, Anthea J

“…Plasmasphere erosion carries cold dense plasma of ionospheric origin in a storm-enhanced density plume extending from dusk toward and through the noontime cusp and dayside magnetopause and back across polar latitudes in a polar tongue of ionization. …”
Get full text

Ionospheric longitudinal variations at midlatitudes: Incoherent scatter radar observation at Millstone Hill by Zhang, Shun-Rong, Coster, Anthea J, Holt, John M, Foster, John C, Erickson, Philip J

Get full text

Storm enhanced density: magnetic conjugacy effects by Foster, John C, Rideout, William C

“…In the early phases of a geomagnetic storm, the low and mid-latitude ionosphere are greatly perturbed. Large SAPS electric fields map earthward from the perturbed ring current overlapping and eroding the outer plasmasphere and mid-latitude ionosphere, drawing out extended plumes of storm enhanced density (SED). …”
Get full text

Multiradar observations of the polar tongue of ionization by McCready, M., van Eyken, A., Barnes, R. J., Greenwald, R. A., Rich, F. J., Foster, John C, Coster, Anthea J, Erickson, Philip J, Holt, John M, Lind, Frank David, Rideout, William C

“…[1] We present a global view of large‐scale ionospheric disturbances during the main phase of a major geomagnetic storm. …”
Get full text

SAPS: A new categorization for sub-auroral electric fields by Burke, W. J., Foster, John C

“…Sub‐auroral electric fields play critical roles in energizing and transporting ring current ions, as well as convecting thermal plasma in the inner magnetosphere and in the mid‐ to low‐latitude ionosphere. A number of terms have been employed to describe the sub‐auroral electric fields and many of these are specifically associated with processes established through their prior use in the literature. …”
Get full text

Cold plasma redistribution throughout geospace by Foster, John C

“…The redistribution of the electrically charged cold plasma of ionospheric origin involves the equatorial, low, mid, auroral, and polar-latitude regions in a multi-step, system-wide process linking the regions of geospace. …”
Get full text

Multi‐Point Observations of the Geospace Plume by Foster, John C, Erickson, P. J., Walsh, B. M., Wygant, J. R., Coster, A. J., Zhang, Qing‐He

“…Simultaneous multi-instrument observations of the redistribution of cold (<2 eV) plasma of ionospheric origin emphasize the role and importance of this system-wide phenomenon in the processes and across the regions of geospace. …”
Get full text

Stormtime observations of the flux of plasmaspheric ions to the dayside cusp/magnetopause by Rich, F. J., Sandel, B. R., Foster, John C, Coster, Anthea J, Erickson, Philip J

“…[1] For the large geomagnetic disturbance on April 11, 2001, we combine data from the Millstone Hill radar, a network of GPS TEC receivers, and the DMSP F‐12 and IMAGE satellites, to estimate the sunward flux of thermal plasma associated with erosion of the outer plasmasphere/ionosphere in the dusk sector. Direct radar observations of the E×B advection of SED plasma determine a flux of >10E26 ions/s to the noontime cusp at F‐region heights. …”
Get full text

Average characteristics and activity dependence of the subauroral polarization stream by Foster, John C, Vo, H. B.

“…[1] Data from the Millstone Hill incoherent scatter radar taken over two solar cycles (1979–2000) are examined to determine the average characteristics of the disturbance convection electric field in the midlatitude ionosphere. Radar azimuth scans provide a regular database of ionospheric plasma convection observations spanning auroral and subauroral latitudes, and these scans have been examined for all local times and activity conditions.We examine the occurrence and characteristics of a persistent secondary westward convection peak which lies equatorward of the auroral two‐cell convection. …”
Get full text

Van Allen Probes Observations of Oxygen Ions at the Geospace Plume by Foster, John C, Erickson, Philip J

“…The geospace plume couples the ionosphere, plasmasphere, and magnetosphere from sub-auroral regions to the magnetopause, on polar field lines, and into the magnetotail. …”
Get full text

Millstone Hill coherent-scatter radar observations of electric field variability in the sub-auroral polarization stream by Foster, John C, Erickson, Philip J, Lind, Frank David, Rideout, William C

“…[1] Coherent backscatter observations with the Millstone Hill UHF radar (MHR) are used to investigate spatial/temporal variations in the ionospheric sub‐auroral polarization stream (SAPS) electric field. …”
Get full text

Prompt energization of relativistic and highly relativistic electrons during a substorm interval: Van Allen Probes observations by Baker, D. N., Claudepierre, S. G., Kletzing, C. A., Kurth, W., Reeves, G. D., Thaller, S. A., Spence, H. E., Shprits, Y. Y., Wygant, J. R., Foster, John C, Erickson, Philip J

“…We present multi-instrument observations from the Van Allen Probes spacecraft Radiat ion Belt Storm Probe A and Radiation Belt Storm Probe B at ~6 Re in the midnight sector magnetosphere and from ground-based ionospheric sensors during a substorm dipolarization followed by rapid reenergization of multi-MeV electrons. …”
Get full text