Open Access
Table 1.
Examples of types of ROTI used in literature.
| Reference | Sampling rate | Time interval of ROTI calculation | Reason for the choice of sampling rate | Reason for the choice of time interval |
|---|---|---|---|---|
| Pi et al. (1997) | 1/30 s | 5 min | 1/30 s was the sampling rate of the data source used | “…allows a relatively high time resolution.” |
| Basu et al. (1999) | 1/30 s | 5 min | 1/30 s was the sampling rate of the data source used | Refers to Pi et al. (1997). |
| Beach & Kintner (1999) | Both 1/s and 1/30 s | 5 min | To compare results using high-resolution and low-resolution data. | “The basis for a 5-min averaging period is to permit direct comparison of ROTI with the results of Pi et al. [1997],…” |
| Krankowski et al. (2006) | 1/30 s | 30 min | “This study focuses on the occurrence of large-scale TEC fluctuations related to patch structures detected using GPS observations over Antarctic IGS stations. … ROT computed at a 30-s interval provides data on the structures on a scale of the order of kilometers at high latitudes.” | “At the size of 400–1000 km and the speed of the patch structure of 600–800 m/s, the duration of TEC eruption recognized the patch within 15–30 min. With a view to patch structure recognition, the index ROT at 30 min intervals was calculated for individual satellite passes.” |
| Xu et al. (2006) | 1/s | 5 min | No reason stated in the paper. (But there is some discussion of scale sizes in the text.) | No reason stated in the paper. |
| Xiong et al. (2007) | 1/15 s | 1 min | 1/15 s was the sampling rate of the data source used | “The interval of the S4 data is 1 min.” (They compare ROTI and S4 measurements in the paper.) |
| Carrano & Groves (2007) | 10/s to 50/s | 1 min | “…the fast ROTI parameter is sensitive to irregularities on the order of 24 m, which is smaller than the Fresnel scale, and hence to irregularities that can contribute to amplitude scintillations at the L1 frequency.” | No reason stated in the paper, but it was likely chosen to be the same as the time resolution of the scintillation indices. |
| Sripathi et al. (2011) | 1/30 s | 5 min | No reason stated in the paper. (But there is some discussion of scale sizes in the text) | Refers to Pi et al. (1997). |
| Jacobsen & Schäfer (2012) | 1/s | 5 min | 1/s was the sampling rate of the data source used. (But there is some discussion of scale sizes in the text.) | Refers to Pi et al. (1997). |
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