Riometer quiet day curves

Heisler, R.; Hower, G. L.

doi:10.1029/jz072i021p05485

Cited by 11 publications

(11 citation statements)

References 6 publications

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“…), São Martinho da SerraBrazil. Its operation is based on determining the Quiet Day Curve (QDC), which methodology has been discussed extensively for several authors (Mitra and Shain, 1953;Lusignan, 1960;Fredriksen and Dyce, 1960;Steiger and Warwick, 1961;Heisler and Hower, 1967;Armstrong et al, 1977;Krishnaswamy et al, 1985;Tanaka et al, 2007).…”

Section: Instrumentation E Methodsmentioning

confidence: 99%

A discussion about some aspects of the solar-terrestrial systems coupling with regard to space weather effects

Denardini

Resende

Moro

et al. 2011

12th International Congress of the Brazilian Geophysical Society &Amp; EXPOGEF, Rio De Janeiro, Brazil, 15–18 August 2011

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In the present paper we present a discussion about some aspects of the solar-terrestrial system coupling with regard to space weather effects based on some recent studies of energetic particles precipitation at the South American Magnetic Anomaly and the cosmic noise absorption seem by image riometers, and abnormal enhancement of the equatorial sporadic E-layers density during the recovery phase of magnetic storm.

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Section: Instrumentation E Methodsmentioning

confidence: 99%

A discussion about some aspects of the solar-terrestrial systems coupling with regard to space weather effects

Denardini

Resende

Moro

et al. 2011

12th International Congress of the Brazilian Geophysical Society &Amp; EXPOGEF, Rio De Janeiro, Brazil, 15–18 August 2011

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“…It has been found that CNA is measured relative to the baseline of cosmic noise signal level received under quiet ionospheric conditions, which makes it important to obtain a reliable quiet day curve (QDC). As riometers have been widely used in observation of ionospheric absorption, there have been some methodology studies of the QDC generation [14][15][16][17]. However, despite lots of work done on this subject, an agreement on the methodology of the QDC generation is still out of reach.…”

Section: Introductionmentioning

confidence: 99%

A new technique for deriving the quiet day curve from imaging riometer data at Zhongshan Station, Antarctic

et al. 2014

Sci. China Technol. Sci.

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A new technique for estimating quiet day curve (QDC) was suggested. To validate the new approach, QDCs were derived from data acquired by the imaging riometer installed at the Chinese Zhongshan Station in Antarctic. The evaluation was performed by comparing the difference between QDC derived by the new technique and those derived by Tanaka's technique. The results were discussed in terms of the diurnal variation and discrepancy. Also, cosmic noise absorption (CNA) images were built using both techniques in order to evaluate the implications of the changes when obtaining them using different methods of the QDC determination. The influence of the multiplicative factor value on the QDC determination in Tanaka's technique was evaluated. riometer, absorption, techniqueCitation: He F, Hu H Q, Hu Z J, et al. A new technique for deriving the quiet day curve from imaging riometer data at Zhongshan Station

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“…The highest “reliable” value for a given sidereal time interval would then be a point on the QDC. Some researchers, for example Heisler and Howler [1967], Lusignan [1960] and Mitra and Shain [1953], however questioned the accuracy of the QDC derived in this way as the minimum attenuation on undisturbed days does not necessarily return to zero and is subjected to a seasonal variation.…”

Section: Introductionmentioning

confidence: 99%

Determining riometer quiet day curves 1. The matrix method

Drevin

Stoker

2003

Radio Science

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[1] A number of methods have been proposed for the determination of quiet day curves of riometer recordings of cosmic radio noise in polar regions. Most of these methods are based on the distribution of the recorded intensities, in a given siderial time period, over a number of consecutive days. The method proposed in this paper is based on the filtering, using a low-pass filter in the Fourier domain, of a discrete two-dimensional function or matrix. The two dimensions of the matrix are siderial time and day number, with each row of the matrix representing one siderial day. With a low-pass filter the low frequency Fourier coefficients are retained while the high frequency Fourier coefficients are discarded. The highest Fourier coefficient that is retained is the cutoff frequency of the filter. The proposed method was compared to two existing methods using data obtained from a single broad beam antenna. It was found that the proposed method is less sensitive to noise than the existing methods.INDEX TERMS: 6964 Radio Science: Radio wave propagation; 6982 Radio Science: Tomography and imaging; 6974 Radio Science: Signal processing; Citation: Drevin, G. R., and P. H. Stoker, Determining riometer quiet day curves 1. The matrix method,

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Riometer quiet day curves

Cited by 11 publications

References 6 publications

A discussion about some aspects of the solar-terrestrial systems coupling with regard to space weather effects

A discussion about some aspects of the solar-terrestrial systems coupling with regard to space weather effects

A new technique for deriving the quiet day curve from imaging riometer data at Zhongshan Station, Antarctic

Determining riometer quiet day curves 1. The matrix method

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