Correlation of IRTAM and FPMU data confirming the application of IRTAM to support ISS Program safety

Hartman, William A.; Schmidl, William D.; Mikatarian, Ron; Galkin, I. A.

doi:10.1016/j.asr.2018.12.007

Cited by 5 publications

(4 citation statements)

References 8 publications

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“…The plasma density and temperature data products returned by FPMU have been used in past studies addressing ionospheric variability during geospace events (Coffey et al., 2017; Yang et al., 2020). They have also aided data assimilation for models (Hartman et al., 2019), as well as model‐data comparisons (Broadwater, 2013; Willis & Pour, 2018).…”

Section: Introductionmentioning

confidence: 99%

Observations and Validation of Plasma Density, Temperature, and Abundance From a Langmuir Probe Onboard the International Space Station

et al. 2021

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Section: Introductionmentioning

confidence: 99%

Observations and Validation of Plasma Density, Temperature, and Abundance From a Langmuir Probe Onboard the International Space Station

et al. 2021

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“…The Floating Potential Measurement Unit (FPMU) on board the International Space Station (ISS) has been making plasma density and electron temperature measurements since 2006. Most of these data have been used only for validation purposes under different geophysical conditions (Barjatya et al., 2009; Coffey et al., 2008; Debchoudhury et al., 2021; Hartman et al., 2019). Recently, FPMU data has also been used for studying morning electron temperature overshoots (Yang et al., 2020), and nighttime O + dropouts (Debchoudhury et al., 2022).…”

Section: Introductionmentioning

confidence: 99%

Ion Density Climatology Based on FPMU Measurements on Board the International Space Station

Laranja,

Fejer,

Ridenti

et al. 2023

JGR Space Physics

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We performed, for the first time, a season‐dependent geomagnetically quiet‐time climatology of mid‐ and low‐latitude ion densities during low and moderate solar flux conditions using Floating Potential Measurement Unit (FPMU) observations aboard the International Space Station (ISS) from 2008 to 2019. Our daytime observations indicate that the main characteristics of the equatorial ionization anomaly (EIA) at ∼400 km are consistent with those from other in situ and remote sensing probes. The FPMU daytime densities are also generally in good agreement with the corresponding results from the International Reference Ionosphere (IRI). However, the IRI does not reproduce the mid‐solar flux evening low‐latitude measured densities. In this period, the EIA exhibits strong longitude‐dependent crest‐to‐trough ratios and asymmetries due to the pre‐reversal enhancement (PRE) of the zonal electric field and thermospheric neutral winds. Our data also show strong structuring of the daytime and nighttime plasma densities. This includes a bulge, discussed for the first time here, in the EIA southern crest in the South Atlantic sector during the December solstice and equinox data, which we suggest being generated by the transport of plasma from the Weddell Sea anomaly (WSA). We also highlight and show the evolution of a midlatitude summer nighttime anomaly (MSNA) during the June solstice data in the North Atlantic sector. Our results give new insights into these two anomalies, where we show that they are stronger with increasing solar flux levels and that they last until the early morning. These latter results are not consistent with those from previous studies.

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“…A few previous studies have discussed the ISS FPMU measurements with a focus on data processing and data validation (Barjatya et al., 2009; Coffey et al., 2008; Debchoudhury et al., 2021). There have also been studies published using the ISS FPMU to study spacecraft charging and hazard assessment, the original purpose of the instrument (Hartman et al., 2019; Willis et al., 2017; Wright et al., 2008). This study also shows the utility of the ISS FPMU data set for comparison to other commonly used data sets, like Swarm Electric Field Instrument (EFI) plasma density data or TEC from GNSS.…”

Section: Introductionmentioning

confidence: 99%

Observations of Night‐Time Equatorial Ionosphere Structure With the FPMU on Board the International Space Station

et al. 2022

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The equatorial ionization anomaly (EIA) is a prominent global-scale structuring of the terrestrial low-latitude ionosphere in the form of a trough in the F-region electron density centered on the geomagnetic (dip) equator with two peaks (crests) in the electron density on each side offset in latitude by ±15°. Originally discovered from analysis of ionosonde data (Appleton, 1946;Bailey, 1948), the EIA has been observed extensively with various ground-based and spacecraft instrumentation over many decades. It is now well-understood that EIA is formed by the combined effects of upward (vertical at the equator) E × B plasma drift and diffusion along magnetic field lines. These two forces work together to form the so-called equatorial fountain effect (e.g., Anderson, 1973;Balan et al., 2018;Hanson & Moffett, 1966;Kelley, 2009). The low-latitude E × B drift velocity is dominated by the neutral wind dynamo during geomagnetically quiet times but during active times, includes highly variable transient contributions from prompt penetration effects and longer lived effects from the disturbance dynamo (e.g., Fejer & Maute, 2021). The sensitivity of the EIA to the low-latitude E × B drift velocity (e.g., Anderson, 1973) makes it an excellent diagnostic for studying equatorial electrodynamics (e.g., Balan et al., 2009).The observed north-south asymmetry of the ionization anomaly crests with respect to the geomagnetic equator is caused by the season-dependent asymmetry in the meridional neutral winds (Anderson & Roble, 1981). Effects from the neutral atmosphere can also cause a longitudinal variation in the anomaly's occurrence and size, presumably due to the longitudinal variation of the quiet-time dynamo electric field (e.g., Fejer et al., 2008). In addition, the magnitude of the anomaly crests exhibit a 4-peak (sometimes also identified as a 3-wave) pattern in longitude for a given local time (LT), as observed by remote Far Ultraviolet (FUV) nightglow data in the evening LT sector (

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Correlation of IRTAM and FPMU data confirming the application of IRTAM to support ISS Program safety

Cited by 5 publications

References 8 publications

Observations and Validation of Plasma Density, Temperature, and Abundance From a Langmuir Probe Onboard the International Space Station

Observations and Validation of Plasma Density, Temperature, and Abundance From a Langmuir Probe Onboard the International Space Station

Ion Density Climatology Based on FPMU Measurements on Board the International Space Station

Observations of Night‐Time Equatorial Ionosphere Structure With the FPMU on Board the International Space Station

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