Abstract

The Ionospheric Photometer (IPM) is carried on the Feng Yun 3D (FY3D) meteorological satellite, which allows for the measurement of far-ultraviolet (FUV) airglow radiation in the thermosphere. IPM is a compact and high-sensitivity nadir-viewing FUV remote sensing instrument. It monitors 135.6 nm emission in the night-side thermosphere and 135.6 nm and N2 LBH emissions in the day-side thermosphere that can be used to invert the peak electron density of the F2 layer (NmF2) at night and O / N2 ratio in the daytime, respectively. Preliminary observations show that the IPM could monitor the global structure of the equatorial ionization anomaly (EIA) structure around 2:00 local time using OI 135.6 nm nightglow properly. It could also identify the reduction of O / N2 in the high-latitude region during the geomagnetic storm of Aug. 26, 2018. The IPM derived NmF2 accords well with that observed by 4 ionosonde stations along 120° E with a standard deviation of 26.67 %. Initial results demonstrate that the performance of IPM meets the designed requirement and therefore can be used to study the thermosphere and ionosphere in the future.

Highlights

  • The Ionospheric Photometer (IPM) is carried on the Feng Yun 3D (FY3D) meteorological satellite, which allows for the measurement of far-ultraviolet (FUV) airglow radiation in the thermosphere

  • Preliminary observations show that the IPM could monitor the global structure of the equatorial ionization anomaly (EIA) structure around 2:00 local time using OI 135.6 nm nightglow properly

  • The IPM derived NmF2 accords well with that observed by 4 ionosonde stations along 120oE with a standard deviation of 26.67%

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Summary

Introduction

The Earth’s far-ultraviolet (FUV) airglow radiation from the thermosphere includes the emission of H, O, and N2 and the 25 absorption of O2 (Meier, 1991). The U.S Naval Research Laboratory firstly gave the concept for a new class of ionospheric photometer twenty years ago It was supplied in the Tiny Ionospheric Photometer (TIP) on the Constellation Observing System for Meteorology, Ionosphere, and Climate satellites (Anthes et al, 2008; Dymond et al, 2016), complemented and upgraded in the Tiny Ionospheric Photometer (TIP) as part of the GPS Radio Occultation and Ultralviolet 40 Photometry –Colocated (GROUP-C) experience on the International Space Station (Budzien et al, 2019; Budzien et al, 2017), and notably improved in the Triple Tiny Ionospheric Photometer (Tri-TIP) in Coordinated Ionospheric Reconstruction CubeSat Experience (Dymond et al, 2017; Stephan et al, 2018). This paper presents instrumental descriptions and initial observations by IPM

Instrument parameters requirements
Composition, channel, and mode
Conclusion

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