Presunrise ion temperature enhancement observed at 600 km low‐ and mid‐latitude ionosphere

Chao, Chun-Chieh; Su, S.‐Y.; Yeh, Hund‐Der

doi:10.1029/2002gl016268

Cited by 31 publications

(41 citation statements)

References 12 publications

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“…That is, at higher altitudes (above ∼300 km), the photoelectron heat not only comes from local hemisphere but also from the conjugate hemisphere. Some studies have shown presunrise plasma temperature enhancements was contributed to by the photoelectron heating from the conjugate sunlit region (Evans, 1973;Peterson et al, 1977;Chao et al, 2003, Zhang et al, 2004. During a solar eclipse, photoelectrons in the eclipse region are reduced largely at totality, then in its conjugate region the inflow photoelectron flux from the eclipse region will decrease a lot, which results in a large decrease in electron temperature in this region.…”

Section: Discussionmentioning

confidence: 99%

“…The ionospheric responses to a solar eclipse have been studied extensively with various methods, such as the Faraday rotation measurement, ionosonde network, incoherent scatter radar (ISR), Global Positioning System (GPS), and satellite measurements (e.g., Salah et al, 1986;Tsai and Liu, Correspondence to: L. Liu (liul@mail.iggcas.ac.cn) 1999; Afraimovich et al, 1998;Davis et al, 2000) as well as theoretical modelling (Stubbe, 1970;Müller-Wodarg et al, 1998;Boitman et al, 1999;Le et al, 2008a). These studies have shown that there is an almost consistent behavior at low altitudes where there are distinct depletions in electron concentration and electron temperature during solar eclipses.…”

Section: Introductionmentioning

confidence: 99%

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The ionospheric behavior in conjugate hemispheres during the 3 October 2005 solar eclipse

Liu

Yue

et al. 2009

Ann. Geophys.

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Abstract.We investigate the ionospheric behavior in conjugate hemispheres during the 3 October 2005 solar eclipse, on the basis of observations of electron temperature (T e ) from the Defense Meteorological Satellites Program (DMSP) spacecraft, F2 layer critical frequency (foF2) and F2 layer peak height (hmF2) at the Grahamstown ionosonde station, and total electron content (TEC) from the Global Positioning System (GPS) station SUTH. The observations show that when the eclipse occurred in the Northern Hemisphere, there was a decrease in T e , an increase in foF2 and TEC, and an uprising in hmF2 in its conjugate region compared with their reference values. We also simulated the ionosphere behavior during this eclipse using a mid-and low-latitude ionospheric model. The simulations agree well with the observations. Because of the eclipse effect, there are far fewer photoelectrons travelling along the magnetic field lines from the eclipse region to the conjugate region, resulting in reduced photoelectron heating in the conjugate hemisphere which causes a drop in electron temperature and subsequent disturbances in the region.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The ionospheric behavior in conjugate hemispheres during the 3 October 2005 solar eclipse

Liu

Yue

et al. 2009

Ann. Geophys.

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show abstract

“…There are some studies on the ionospheric response to solar eclipse on the basis of the numerical simulations in the past (e.g. Stubbe, 1970;Roble et al, 1986;Müller-Wodarg et al, 1998;Boitman et al, 1999;Liu et al, 1999;Korenkov et al, 2003a, b). However, for the variations of solar radiation during a solar eclipse, they only considered the occultation of the photosphere, i.e.…”

Section: Ionospheric Model and Solar Radiation During An Eclipsementioning

confidence: 99%

“…In the past, there have been some studies on the ionospheric response to solar eclipses on the basis of numerical simulations (e.g. Stubbe, 1970;Roble et al, 1986;Müller-Wodarg et al, 1998;Boitman et al, 1999;Liu et al, 1999;Korenkov et al, 2003aKorenkov et al, , 2003b. However, they only considered the occultation of the photosphere being shielded by the Moon for variations in solar radiation during a solar eclipse.…”

Section: Introductionmentioning

confidence: 99%

The ionospheric responses to the 11 August 1999 solar eclipse: observations and modeling

Liu

Yue

et al. 2008

Ann. Geophys.

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Abstract.A total eclipse occurred on 11 August 1999 with its path of totality passing over central Europe in the latitude range 40 • -50 • N. The ionospheric responses to this eclipse were measured by a wide ionosonde network. On the basis of the measurements of foE, foF1, and foF2 at sixteen ionosonde stations in Europe, we statistically analyze the variations of these parameters with a function of eclipse magnitude. To model the eclipse effects more accurately, a revised eclipse factor, F R , is constructed to describe the variations of solar radiation during the solar eclipse. Then we simulate the effect of this eclipse on the ionosphere with a mid-and low-latitude ionosphere theoretical model by using the revised eclipse factor during this eclipse. Simulations are highly consistent with the observations for the response in the E-region and F1-region. Both of them show that the maximum response of the mid-latitude ionosphere to the eclipse is found in the F1-region. Except the obvious ionospheric response at low altitudes below 500 km, calculations show that there is also a small response at high altitudes up to about 2000 km. In addition, calculations show that when the eclipse takes place in the Northern Hemisphere, a small ionospheric disturbance also appeared in the conjugate hemisphere.

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“…Ion parameter global distributions were derived from the ROCSAT-1 observation and revealed many unique features in various local time sectors, like pre-dawn heating (Chao et al 2003b(Chao et al , 2010, ion temperature crests in the morning hours (Chao et al 2004), and movements of the temperature crests in the afternoon sector , etc. However, lack of electron temperature measurement in the ROCSAT-1 satellite, many temperature features could not be fully understood.…”

Section: Background Ionospherementioning

confidence: 99%

Advanced Ionospheric Probe scientific mission onboard FORMOSAT-5 satellite

Lin¹,

Chao²,

Liu³

et al. 2017

Terr. Atmos. Ocean. Sci.

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Advanced Ionospheric Probe (AIP) is a piggyback science payload developed by National Central University for FORMOSAT-5 satellite to explore space weather/ climate and seismic precursors associated with strong earthquakes. The AIP is an all-in-one plasma sensor that measures ionospheric plasma concentrations, velocities, and temperatures in a time-sharing way and is capable of measuring ionospheric plasma irregularities at a sample rate up to 8192 Hz over a wide range of spatial scales. Electroformed gold grids used in the AIP in theory construct planar electric potential surfaces better than woven grids. Moreover, a plasma injection test performed in the Space Plasma Simulation Chamber has verified that no significant hysteresis is found in current-voltage curves measured by the AIP. It indicates that the AIP can make an accurate measurement of the ionospheric plasma parameters in space. Finally, Ionospheric Plasma and Electrodynamics Instrument (IPEI) observations onboard the ROCSAT-1 satellite are applied to show that the scientific objectives of ionospheric space weather/climate and seismo-ionospheric precursors (SIPs) of the FORMOSAT-5/AIP can be fulfilled. The observations reveal that ion parameter global distributions are helpful in studying the formation and variation in temperature crests and troughs in the 2200 -2300 local time sector, as well as SIPs in the density and the velocity over the epicenter area, which are anticipated for the FORMOSAT-5 satellite orbit.

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Presunrise ion temperature enhancement observed at 600 km low‐ and mid‐latitude ionosphere

Cited by 31 publications

References 12 publications

The ionospheric behavior in conjugate hemispheres during the 3 October 2005 solar eclipse

The ionospheric behavior in conjugate hemispheres during the 3 October 2005 solar eclipse

The ionospheric responses to the 11 August 1999 solar eclipse: observations and modeling

Advanced Ionospheric Probe scientific mission onboard FORMOSAT-5 satellite

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