High-latitude poynting flux from combined Iridium and SuperDARN data

Waters, C. L.; Anderson, B. J.; Greenwald, R. A.; Barnes, R. J.; Ruohoniemi, J. M.

doi:10.5194/angeo-22-2861-2004

Cited by 39 publications

(45 citation statements)

References 47 publications

(84 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example, Waters et al (2004) showed that measurements of ionospheric convection can be combined with magnetic perturbations measured by low-altitude satellites to determine the global magnetic poynting flux at high magnetic latitudes. Their technique used magnetic perturbations measured onboard the Iridium satellites, as well as ionospheric convection electric fields measured by SuperDARN.…”

Section: New Analysis Techniques/capabilitiesmentioning

confidence: 99%

A decade of the Super Dual Auroral Radar Network (SuperDARN): scientific achievements, new techniques and future directions

et al. 2007

Self Cite

View full text Add to dashboard Cite

The Super Dual Auroral Radar Network (SuperDARN) has been operating as an international co-operative organization for over 10 years. The network has now grown so that the fields of view of its 18 radars cover the majority of the northern and southern hemisphere polar ionospheres. SuperDARN has been successful in addressing a wide range of scientific questions concerning processes in the magnetosphere, ionosphere,

show abstract

Section: New Analysis Techniques/capabilitiesmentioning

confidence: 99%

A decade of the Super Dual Auroral Radar Network (SuperDARN): scientific achievements, new techniques and future directions

et al. 2007

Self Cite

View full text Add to dashboard Cite

show abstract

“…In other cases we have used SuperDARN to estimate the electric field (Waters et al, 2004), but as stated above in this event the radar returns are too sparse for this analysis. Instead, we take here advantage of excellent data from the DMSP drift meter and magnetometer instruments, favorable DMSP tracks through the regions of Birkeland currents and auroral emissions, and the sunlit ionospheric conditions (northern summer) that favor a solar EUV dominated ionospheric conductivity.…”

Section: Electromagnetic Energy Flux Estimationmentioning

confidence: 99%

“…The b-distribution is used here in the estimation of the Poynting vector. Due to the coarse time sampling of the Iridium engineering magnetometer data, on average about 200 s between samples on an individual satellite, roughly one hour of data is required to obtain a latitude resolution of approximately 4 • in the Iridium fit results (Anderson et al, 2000;Korth et al, 2004;Waters et al, 2004).…”

Section: Iridium Datamentioning

confidence: 99%

“…On the other hand, global distributions presented in statistical studies are only valid in an average sense and almost certainly differ significantly from those observed during individual events. Recently, Waters et al (2004) used magnetometer data from the Iridium constellation together with electric field results from the Super Dual Auroral Radar Network (SuperDARN) to obtain global distributions of electromagnetic energy flux for two events occurring for southward IMF. Their findings indicate enhanced flux in the auroral zones together with a broad region of flux over the polar cap.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

High-latitude electromagnetic and particle energy flux during an event with sustained strongly northward IMF

et al. 2005

Self Cite

View full text Add to dashboard Cite

Abstract. We present a case study of a prolonged interval of strongly northward orientation of the interplanetary magnetic field on 16 July 2000, 16:00-19:00 UT to characterize the energy exchange between the magnetosphere and ionosphere for conditions associated with minimum solar windmagnetosphere coupling. With reconnection occurring tailward of the cusp under northward IMF conditions, the reconnection dynamo should be separated from the viscous dynamo, presumably driven by the Kelvin-Helmholtz (KH) instability. Thus, these conditions are also ideal for evaluating the contribution of a viscous interaction to the coupling process. We derive the two-dimensional distribution of the Poynting vector radial component in the northern sunlit polar ionosphere from magnetic field observations by the constellation of Iridium satellites together with drift meter and magnetometer observations from the Defense Meteorological Satellite Program (DMSP) F13 and F15 satellites. The electromagnetic energy flux is then compared with the particle energy flux obtained from auroral images taken by the far-ultraviolet (FUV) instrument on the Imager for Magnetopause to Aurora Global Exploration (IMAGE) spacecraft. The electromagnetic energy input to the ionosphere of 51 GW calculated from the Iridium/DMSP observations is eight times larger than the 6 GW due to particle precipitation all poleward of 78 • MLAT. This result indicates that the energy transport is significant, particularly as it is concentrated in a small region near the magnetic pole, even under conditions traditionally considered to be quiet and is dominated by the electromagnetic flux. We estimate the contributions of the high and mid-latitude dynamos to both the Birkeland currents and electric potentials finding that highlatitude reconnection accounts for 0.8 MA and 45 kV while we attribute <0.2 MA and ∼5 kV to an interaction at lower latitudes having the sense of a viscous interaction. Given that these conditions are ideal for the occurrence of the KH instability at the magnetopause and hence the viscous interaction, Correspondence to: H. Korth (haje.korth@jhuapl.edu) this result suggests that the viscous interaction is a small contributor to coupling solar wind energy to the magnetosphereionosphere system.

show abstract

“…However, single satellites give information only along the satellite track and cannot "image" the EM input to yield the distribution of incident power. Global distributions of the largescale parallel Poynting vector, providing a complementary perspective to in-situ observations, have recently been evaluated from measurements of the magnetic perturbations at the ionosphere by the constellation of Iridium satellites and observations of the ionospheric electric field by the Super Dual Auroral Radar Network (SuperDARN) (Waters et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Global observations of electromagnetic and particle energy flux for an event during northern winter with southward interplanetary magnetic field

et al. 2008

Self Cite

View full text Add to dashboard Cite

Abstract.The response of the polar ionospherethermosphere (I-T) system to electromagnetic (EM) energy input is fundamentally different to that from particle precipitation. To understand the I-T response to polar energy input one must know the intensities and spatial distributions of both EM and precipitation energy deposition. Moreover, since individual events typically display behavior different from statistical models, it is important to observe the global system state for specific events. We present an analysis of an event in Northern Hemisphere winter for sustained southward interplanetary magnetic field (IMF), 10 January 2002, 10:00-12:00 UT, for which excellent observations are available from the constellation of Iridium satellites, the Super-DARN radar network, and the Far-Ultraviolet (FUV) instrument on the IMAGE satellite. Using data from these assets we determine the EM and particle precipitation energy fluxes to the Northern Hemisphere poleward of 60 • MLAT and examine their spatial distributions and intensities. The accuracy of the global estimates are assessed quantitatively using comparisons with in-situ observations by DMSP along two orbit planes. While the location of EM power input evaluated from Iridium and SuperDARN data is in good agreement with DMSP, the magnitude estimated from DMSP observations is approximately four times larger. Corrected for this underestimate, the total EM power input to the Northern Hemisphere is 188 GW. Comparison of IMAGE FUVderived distributions of the particle energy flux with DMSP plasma data indicates that the IMAGE FUV results similarly locate the precipitation accurately while underestimating the precipitation input somewhat. The total particle input is estimated to be 20 GW, nearly a factor of ten lower than the Correspondence to: H. Korth (haje.korth@jhuapl.edu) EM input. We therefore expect the thermosphere response to be determined primarily by the EM input even under winter conditions, and accurate assessment of the EM energy input is therefore key to achieving a comprehensive understanding of the I-T system, particularly during active times when the energy input increases markedly and expands well equatorward of nominal auroral latitudes.

show abstract

High-latitude poynting flux from combined Iridium and SuperDARN data

Cited by 39 publications

References 47 publications

A decade of the Super Dual Auroral Radar Network (SuperDARN): scientific achievements, new techniques and future directions

A decade of the Super Dual Auroral Radar Network (SuperDARN): scientific achievements, new techniques and future directions

High-latitude electromagnetic and particle energy flux during an event with sustained strongly northward IMF

Global observations of electromagnetic and particle energy flux for an event during northern winter with southward interplanetary magnetic field

Contact Info

Product

Resources

About