Reference health
On the relationship between duration of sunshine and solar radiation on the earth’s surface: Ångström’s equation revisited
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21/21 checkable references clean · checked 2026-07-23
Every reference with a DOI in the deposited reference list resolved to a known work in Crossref or DataCite at the dated check, and none carried a retraction, withdrawal, or removal notice.
9 without a DOI — not checked. A reference deposited without a DOI is never matched by title or guessed at; it stays outside the checked set, and this line discloses that.
The 21 checked references that resolve
resolves10.1002/qj.49705021008
Solar and terrestrial radiation. Report to the international commission for solar research on actinometric investigations of solar and atmospheric radiation
resolves10.1016/0038-092X(82)90302-4
Estimation of the diffuse radiation fraction for hourly, daily and monthly-average global radiation
resolves10.1016/0038-092X(89)90108-4
The probability density function P(Kh,Kh) of the clearness index: A new approach
resolves10.1016/0038-092X(94)00133-X
A critical look at recent interpretations of the Ångström approach and its future in global solar radiation prediction
resolves10.1016/0038-092X(94)90656-4
The Ångström formula with coefficients having a physical meaning
resolves10.1016/0038-092X(90)90015-5
A model for diffuse and global irradiation on horizontal surfaces
resolves10.1016/0038-092X(95)00067-2
Statistical distribution of the clearness index with radiation data integrated over five minute intervals
resolves10.1175/1520-0493(1919)47<769:VITTAL>2.0.CO;2
VARIATIONS IN THE TOTAL AND LUMINOUS SOLAR RADIATION WITH GEOGRAPHICAL POSITION IN THE UNITED STATES
resolves10.1016/0038-092X(84)90231-7
Statistical comparison of solar radiation correlations Monthly average global and diffuse radiation on horizontal surfaces
resolves10.1016/0038-092X(91)90081-7
Cloud cover as derived from surface observations, sunshine duration, and satellite observations
resolves10.1016/0038-092X(77)90006-8
Correlation equation for hourly diffuse radiation on a horizontal surface
resolves10.1016/0002-1571(78)90014-6
A new method for estimating the regression coefficients in the formula relating solar radiation to sunshine
resolves10.1016/0038-092X(92)90155-4
The probability density and autocorrelation of short-term global and beam irradiance
resolves10.1016/0038-092X(94)90038-8
The effect of time errors on the accuracy of solar radiation measurements
resolves10.1016/0038-092X(89)90032-7
The distribution of average instantaneous terrestrial solar radiation over the day
resolves10.1016/S0038-092X(96)00117-X
Modelling a permanent magnet DC motor/centrifugal pump assembly in a photovoltaic energy system
resolves10.1016/S0038-092X(98)00035-8
One-minute global irradiance probability density distributions conditioned to the optical air mass
The 9 references without a DOI — listed, not checked
no DOI — not checkedOn the computation of global radiation from records of sunshine
no DOI — not checked10.1016/S0038-092X(00)00004-9_BIB3
no DOI — not checkedWorld distribution of solar radiation
no DOI — not checked10.1016/S0038-092X(00)00004-9_BIB15
no DOI — not checkedEvaporation from a water surface in relation to solar radiation
no DOI — not checkedThe calculation of monthly mean solar radiation for horizontal and inclined surfaces from sunshine records for latitudes 40°N–40°S
no DOI — not checkedAnalysis of the bimodal behaviour in solar radiation measurements
no DOI — not checked10.1016/S0038-092X(00)00004-9_BIB22
no DOI — not checkedCumulative probability distribution curves of insolation values for tilted surfaces
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carried a retraction notice at that time. It says nothing about the quality, findings,
or importance of the work itself, and nothing about references deposited without a DOI.
checked 2026-07-23 — re-checked daily as this page is visited; titles and statuses come from Crossref and DataCite and are not part of the signed record
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