Variability of the F-region parameter h0.5

Mahajan, K. K.; Kohli, R.; Sethi, N.K.; Pandey, Vibhav

doi:10.1016/s0273-1177(99)80023-4

Cited by 15 publications

(9 citation statements)

References 4 publications

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“…In equinox and summer B0-Gul overestimates the observations in the daytime. In the earlier studies, Mahajan et al (1995) also reported that during solar minimum period (1974)(1975)(1976)(1977) B0-Gul were significantly larger during daytime in equinox and summer. B0-Tab represents the diurnal variation not quite well, particularly in winter when the median values of B0-Tab are unchanged.…”

Section: Data and Analysis Methodsmentioning

confidence: 74%

A comparative study of the bottomside profile parameters over Wuhan with IRI-2001 for 1999–2004

et al. 2006

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The diurnal, seasonal, and solar activity variations of the bottomside ionospheric profile parameters B0 and B1 are studied using electron density profiles measured over Wuhan (30.4 • N, 114.4• E) of China with a DGS-256 Digisonde during 1999-2004. Comparisons are made with the International Reference Ionosphere model (IRI-2001) using both the standard option (B0-Tab and B1-Tab) and the Gulyaeva's option (B0-Gul and B1-Gul). The results show that: (1) observed B0 has distinct diurnal and seasonal variations, while observed B1 changes little with season. The value of B0 is larger in summer than that in equinox and winter, especially for daytime. In winter and equinox, B0 also presents morning and afternoon collapses as reported by Lei et al. (2004). (2) B0 increases about 18.6 km from low solar activity (LSA) to high solar activity (HSA). B1 in HSA is smaller than that in LSA before 10:00 LT and with an opposite tendency during the rest time. (3) Observed B0 is in better agreement with B0-Gul than with B0-Tab, though the B0-Gul overestimates during 09:00 to 17:00 LT in equinox and summer. B0-Tab is 12-20 km larger than the observations over Wuhan almost all the time. Meanwhile, B1-Tab is in good agreement with the observations.

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Section: Data and Analysis Methodsmentioning

confidence: 74%

A comparative study of the bottomside profile parameters over Wuhan with IRI-2001 for 1999–2004

et al. 2006

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“…In earlier studies, Mahajan et al (1995), using Arecibo measurements (a lowlatitude station) during solar minimum period (1974)(1975)(1976)(1977) showed that B0 values based on Gulyaeva's 1987 model were significantly larger, especially during daytime, for summer and equinox seasons, than those obtained from the measurements. Later, Pandey and Sethi (1996), using I.S.…”

Section: Introductionmentioning

confidence: 91%

The bottomside parameters <i>B0</i>, <i>B1</i> obtained from incoherent scatter measurements during a solar maximum and their comparisons with the IRI-2001 model

Sethi

Mahajan

2002

Ann. Geophys.

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Abstract. High resolution electron density profiles (Ne) measured with the Arecibo (18.4 N, 66.7 W), Incoherent Scatter radar (I.S.) are used to obtain the bottomside shape parameters B0, B1 for a solar maximum period . Median values of these parameters are compared with those obtained from the IRI-2001 model. It is observed that during summer, the IRI values agree fairly well with the Arecibo values, though the numbers are somewhat larger during the daytime. Discrepancies occur during winter and equinox, when the IRI underestimates B0 for the local times from about 12:00 LT to about 20:00 LT. Furthermore, the IRI model tends to generally overestimate B1 at all local times. At Arecibo, B0 increases by about 50%, and B1 decreases by about 30% from solar minimum to solar maximum.

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“…Mahajan et al (1995) showed using Arecibo incoherent scatter radar data during solar minimum period (1974±1977) that IRI with recommended option produced a bottomside thickness, which was too thick by varying amounts depending on season and improvements to IRI have been suggested based on this work. In order to examine the variability of B0 around midday (10±14 h), we have deduced it from Arecibo measurements using Eq.…”

Section: Analysis and Resultsmentioning

confidence: 78%

“…In view of similarity between the behaviour of hmF2 and h05 as shown earlier by Mahajan et al (1995) using Arecibo N(h) pro®les during solar minimum period (1974±1977), we have examined the relationship between these two parameters for summer, winter and equinox. Figure 4a shows plot of h0.5 against hmF2 along with the best ®ts during summer, winter and equinox.…”

Section: Analysis and Resultsmentioning

confidence: 89%

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Comparative study of electron density from incoherent scatter measurements at Arecibo with the IRI-95 model during solar maximum

Sethi¹,

Pandey²

2001

Annales Geophysicae

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Abstract. Arecibo (18.4 N, 66.7 W) incoherent scatter (IS) observations of electron density N(h) are compared with the International Reference Ionosphere (IRI-95) during midday (10±14 h), for summer, winter and equinox, at solar maximum (1981). The N(h) pro®les below the F2 peak, are normalized to the peak density NmF2 of the F region and are then compared with the IRI-95 model using both the standard B0 (old option) and the Gulyaeva-B0 thickness (new option). The thickness parameter B0 is obtained from the observed electron density pro®les and compared with those obtained from the IRI-95 using both the options. Our studies indicate that during summer and equinox, in general, the values of electron densities at all the heights given by the IRI model (new option), are generally larger than those obtained from IS measurements. However, during winter, the agreement between the IRI and the observed values is reasonably good in the bottom part of the F2 layer but IRI underestimates electron density at F1 layer heights. The IRI pro®les obtained with the old option gives much better results than those generated with the new option. Compared to the observations, the IRI pro®les are found to be much thicker using Gulyaeva-B0 option than using standard B0.

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Variability of the F-region parameter h0.5

Cited by 15 publications

References 4 publications

A comparative study of the bottomside profile parameters over Wuhan with IRI-2001 for 1999–2004

A comparative study of the bottomside profile parameters over Wuhan with IRI-2001 for 1999–2004

The bottomside parameters <i>B0</i>, <i>B1</i> obtained from incoherent scatter measurements during a solar maximum and their comparisons with the IRI-2001 model

Comparative study of electron density from incoherent scatter measurements at Arecibo with the IRI-95 model during solar maximum

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Variability of the F-region parameter h0.5

Cited by 15 publications

References 4 publications

A comparative study of the bottomside profile parameters over Wuhan with IRI-2001 for 1999–2004

A comparative study of the bottomside profile parameters over Wuhan with IRI-2001 for 1999–2004

The bottomside parameters &lt;i&gt;B0&lt;/i&gt;, &lt;i&gt;B1&lt;/i&gt; obtained from incoherent scatter measurements during a solar maximum and their comparisons with the IRI-2001 model

Comparative study of electron density from incoherent scatter measurements at Arecibo with the IRI-95 model during solar maximum

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The bottomside parameters <i>B0</i>, <i>B1</i> obtained from incoherent scatter measurements during a solar maximum and their comparisons with the IRI-2001 model