Definition of "Solar"

We have not yet the instruments that we want for that work, but I have asked for a Solar spectrograph, and I am already in the preliminary talkings to order a spectroheliograph […]

1906, Filipe Valle, in Arthur Schuster (editor), Transactions of the International Union for Co-operation in Solar Research, Volume I, [Victoria] University [of Manchester] Press, page 115

Values at the Solar location (Merrifield, 1992) are denoted by the subscript ○, and the present epoch is t ≡ 0, […]

2001, John J. Matese et al., "Oort cloud flux due to the Galactic tide", in Mikhail Ya. Marov and Hans Rickman (editors), Collisional Processes in the Solar System, Kluwer Academic Publishers, page 93

Here our knowledge is somewhat more certain, especially in the local Solar neighbourhood.

2004, M. A. C. Perryman, “Our Galaxy in three-dimensions: the Jeremiah Horrocks Memorial Lecture”, in D.W. Kurtz, editor, Transits of Venus: New Views of the Solar System and Galaxy, Cambridge University Press, published 2005, page 318

Data on absolute values of Solar flux in the wave-range λ < 130nm and in the hydrogen line Lα (λ = 121.6nm) were obtained on-board both CORONAS satellites.

2004, T. V. Kazachevskaya et al., “Measurments[sic] of Solar EUV fluxes on board the ‘CORONAS’ satellites: equipment and main results”, in Alexander V. Stepanov et al., editors, Multi-Wavelength Investigations of Solar Activity: Proceedings IAU Symposium No. 223, 2004, Cambridge University Press, page 633