Scientific Mission of the IPEI Payload Onboard ROCSAT-1

Yeh, Hund‐Der; Su, S.‐Y.; Yeh, Yoo-Hsiu; Wu, J. M.; Heelis, R. A.; Holt, B. J.

doi:10.3319/tao.1999.10.s.19(rocsat)

Cited by 59 publications

(53 citation statements)

References 2 publications

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“…At the time of writing, CHAMP is still operational, and the present data set covers 8 years between 2000. Fejer et al (2008 presented a climatological model of the equatorial F-region vertical plasma drift, which is based on measurements taken by the Ionospheric Plasma and Electrodynamic Probe Instrument (IPEI) on board the ROCSAT-1 satellite (Yeh et al, 1999) Figure 1 provides two examples of the local time variation of the vertical plasma drift velocity, v z , as provided by the ROCSAT-1 model at −75 • E and at 0 • E separately for each season. The vertical plasma drifts are predominantly downward during night time and upward during the day with pre-noon maxima.…”

Section: Fe Pmentioning

confidence: 99%

Relation between the occurrence rate of ESF and the equatorial vertical plasma drift velocity at sunset derived from global observations

2008

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Abstract. In this study, we investigate two global climatological data sets; the occurrence rate of Equatorial Spread-F (ESF), associated with equatorial plasma irregularities, at ∼400 km altitude obtained from CHAMP observations, and the evening equatorial vertical plasma drift, v z , from ROCSAT-1 measurements. First, as retrieved for a solar flux level of F10.7=150, the longitudinal variation of the two independently derived quantities correlates between 84% and 93% in the seasons December solstice, equinox and June solstice. The highest correlation is found for the solstice seasons when v z is integrated over local time around the prereversal enhancement (PRE) and displaced 6 • towards east. The integrated v z is a suitable estimate of the ionospheric height at the time just after the PRE and the 6 • displacement is consistent with ESF eastward drift during 2 h which is assumed between creation and detection at satellite altitudes. Second, our analyses reveal a global threshold v z which is required to observe ESF at satellite altitudes. This threshold depends linearly on solar flux with correlations of 97%. Both results bring global evidence on the linear relations between ESF and the vertical plasma drift which have been proven only by local observations so far. This paper includes the first global map of the seasonal/longitudinal variation of the ESF occurrence rate over local time being valid for high solar flux years [2001][2002][2003][2004]. The map reveals, e.g. a longitudinal dependence of the persistence of the plasma irregularities indicating that longitude dependent mechanisms other than the PRE determine the ESF lifetime.

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Section: Fe Pmentioning

confidence: 99%

Relation between the occurrence rate of ESF and the equatorial vertical plasma drift velocity at sunset derived from global observations

2008

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“…Our study of storm-time conditions in the topside ionosphere is based on experimental data from the near-Earth ROCSAT-1 satellite which has a circular orbit with 35 • inclination and is at an ∼600 km altitude (Chang et al, 1999). The ionospheric Plasma and Electrodynamics Instrument (IPEI) on board ROCSAT-1 provides experimental information about the characteristic features of ionospheric ion density, temperature, composition and drift velocity (Yeh et al, 1999). In the present study we use 1-s resolution IPEI data of the ion density, temperature and vertical drift velocity for analyses.…”

Section: Storm-time Ionospheric Disturbancesmentioning

confidence: 99%

Storm-time ionization enhancements at the topside low-latitude ionosphere

Дмитриев

Yeh

2008

Ann. Geophys.

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Abstract.Ion density enhancements at the topside lowlatitude ionosphere during a Bastille storm on 15-16 July 2000 and Halloween storms on 29-31 October 2003 were studied using data from ROCSAT-1/IPEI experiment. Prominent ion density enhancements demonstrate similar temporal dynamics both in the sunlit and in the nightside hemispheres. The ion density increases dramatically (up to two orders of magnitude) during the main phase of the geomagnetic storms and reaches peak values at the storm maximum. The density enhancements are mostly localized in the region of a South Atlantic Anomaly (SAA), which is characterized by very intense fluxes of energetic particles. The dynamics of nearEarth radiation was studied using SAMPEX/LEICA data on >0.6 MeV electrons and >0.8 MeV protons at around 600 km altitude. During the magnetic storms the energetic particle fluxes in the SAA region and in its vicinity increase more than three orders of magnitude. The location of increased fluxes overlaps well with the regions of ion density enhancements. Two mechanisms were considered to be responsible for the generation of storm-time ion density enhancements: prompt penetration of the interplanetary electric field and abundant ionization of the ionosphere by enhanced precipitation of energetic particles from the radiation belt.

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“…The combined instrument has a rich heritage and has been flown in the relevant environment on several spacecraft such as the ones below. The ROCSAT-1/FORMO-SAT-1 spacecraft, which was in a circular orbit at an altitude of 600 km, included such an instrument in its IPEI (Ionospheric Plasma and Electrodynamics Instrument) instrument (Yeh et al 1999). The CINDI (Coupled Ion-Neutral Dynamics Investigation) mission also included such an instrument which operated at altitudes of 400-860 km.…”

Section: Instrumentationmentioning

confidence: 99%

Atmospheric Drag, Occultation ‘N’ Ionospheric Scintillation (ADONIS) mission proposal

Hettrich

Kempf

Perakis

et al. 2015

J. Space Weather Space Clim.

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The Atmospheric Drag, Occultation 'N' Ionospheric Scintillation mission (ADONIS) studies the dynamics of the terrestrial thermosphere and ionosphere in dependency of solar events over a full solar cycle in Low Earth Orbit (LEO). The objectives are to investigate satellite drag with in-situ measurements and the ionospheric electron density profiles with radio occultation and scintillation measurements. A constellation of two satellites provides the possibility to gain near real-time data (NRT) about ionospheric conditions over the Arctic region where current coverage is insufficient. The mission shall also provide global highresolution data to improve assimilative ionospheric models. The low-cost constellation can be launched using a single Vega rocket and most of the instruments are already space-proven allowing for rapid development and good reliability. From July 16 to 25, 2013, the Alpbach Summer School 2013 was organised by the Austrian Research Promotion Agency (FFG), the European Space Agency (ESA), the International Space Science Institute (ISSI) and the association of Austrian space industries Austrospace in Alpbach, Austria. During the workshop, four teams of 15 students each independently developed four different space mission proposals on the topic of ''Space Weather: Science, Missions and Systems'', supported by a team of tutors. The present work is based on the mission proposal that resulted from one of these teams' efforts.

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Scientific Mission of the IPEI Payload Onboard ROCSAT-1

Cited by 59 publications

References 2 publications

Relation between the occurrence rate of ESF and the equatorial vertical plasma drift velocity at sunset derived from global observations

Relation between the occurrence rate of ESF and the equatorial vertical plasma drift velocity at sunset derived from global observations

Storm-time ionization enhancements at the topside low-latitude ionosphere

Atmospheric Drag, Occultation ‘N’ Ionospheric Scintillation (ADONIS) mission proposal

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