WorldCat Identities

Jager, C. de (Cornelis) 1921-

Works: 241 works in 483 publications in 5 languages and 3,097 library holdings
Genres: Conference papers and proceedings 
Roles: Author, Editor, Honoree, Creator, Other, Translator, Contributor, Compiler, Correspondent
Classifications: QB843.B75, 523.82
Publication Timeline
Most widely held works by C. de Jager
The brightest stars by C. de Jager( Book )

16 editions published between 1980 and 1984 in English and Russian and held by 329 WorldCat member libraries worldwide

No part of the Hertzsprung-Russell diagram shows a more pronounced diversity of stellar types than the upper part, which contains the most luminous stars. Can one visualize a larger difference than between a luminous, young and extremely hot Of star, and a cool, evolved pulsating giant of the Mira type, or an S-type supergiant, or - again at the other side of the diagram - the compact nucleus of a planetary nebula? But there is order and unity in this apparent disorder! Virtually all types of bright stars are evolutionally related, in one way or the other. Evolution links bright stars. In many cases the evolution is speeded up by, or at least intimately related to various signs of stellar instability. Bright stars lose mass, either continuously or in dramatic sudden events, they vibrate or pulsate - and with these tenuous, gigantic objects this often happens in a most bizarre fashion. Sometimes the evolution goes so fast that fundamental changes are observable in the time span of a human's life - several of such cases have now been identified
Proceedings of the 3rd Workshop From parity violation to hadronic structure and more : PAVI 2006 by K Jager( )

5 editions published in 2007 in English and held by 320 WorldCat member libraries worldwide

This book contains the proceedings of the third international workshop on a oeFrom Parity Violation to Hadronic Structure and more ... a which was held from May 16 to May 20, 2006, at the George Eliopoulos conference center on the Greek island of Milos. It is part of a series that started in Mainz in 2002 and was followed by a second workshop in Grenoble in 2004. While originally initiated by the extraction of the strangeness contribution to the electromagnetic form factors of the nucleon, the workshop series has continuously broadened the focus to the application of Parity Violation using hadr
The Structure of the quiet photosphere and the low chromosphere. Proceedings of the 'Bilderberg' conference held near Arnhem, Holland, April 17-21, 1967 by C. de Jager( Book )

17 editions published in 1968 in English and German and held by 255 WorldCat member libraries worldwide

From 17 to 21 April 1967 a Study Week was held in the hotel 'De Bilderberg' near Arnhem, Holland, with the purpose to establish a new, and if possible, generally acceptable working model for the quiet parts of the solar photosphere and low chromosphere. The organizers of the conference hoped that even if this latter goal appeared too far to be reached, such a meeting would still be useful, if only for enumerating the crucial problems in solar photospheric research, and for defining future subjects of research. About twenty solar physicists from outside the Netherlands participated in the Study Week, while some others, though prevented from actively attending, sub mitted their comments before the meeting. The two above-mentioned goals were reached: a working model could be estab lished; yet it became clear that not everyone would agree about this model, and it became obvious too that future research is strongly needed, in particular in the field of line formation (coherence, or non-coherence; local thermal equilibrium), while also the motion field of the photosphere and chromosphere is insufficiently known, and its influence on the formation of spectral lines hardly understood
Image processing techniques in astronomy : proceedings of a conference held in Utrecht on March 25-27, 1975( Book )

14 editions published in 1975 in English and Italian and held by 238 WorldCat member libraries worldwide

The solar spectrum; proceedings by Solar Spectrum Symposium( Book )

4 editions published in 1965 in English and held by 183 WorldCat member libraries worldwide

Instabilities in luminous early type stars : proceedings of a workshop in honour of Professor Cees de Jager on the occasion of his 65th birthday, held in Lunteren, the Netherlands, 21-24 April 1986 by Henny J. G. L. M Lamers( Book )

14 editions published between 1986 and 1987 in English and held by 159 WorldCat member libraries worldwide

On April 28 1986 Cornelis de Jager reached the age of 65 years. On April 30 he officially retired from the University of Utrecht where he has held a Chair for Stellar Astrophysics, later changed into Space Physics, since 1958. Cees de Jager, as he prefers to be called by his friends, has had an active and successful life in science. His interest in astronomy was raised by his father under the clear skies of Celebes (Indonesia). He started a study in physics and astronomy as a student of the late M. Minnaert in Utrecht during World War II. When in 1943 the occupying forces recruited students who did not want to sign the declaration of loyalty for their war-efforts, Cees and three fellow students went into hiding at the Observatory in Utrecht. During this very "quiet" period van de Hulst developed the theory of the 21 em radiation of neutral hydrogen and de Jager started the observations of variable stars in the pitch dark nights of a country at war. The study of Beta Cepheids rapid­ ly awoke his interest which was kept throughout the years. In 1958 he organized an international campaign to observe 12 Lac spectroscopically and photometrically, which was a great success
Solar flares and space research. Proceedings of the symposium held on the occasion of the eleventh plenary meeting of the Committee on Space Research. Tokyo, Japan, 9-11 May 1968 by Plenary Meeting of COSPAR( Book )

13 editions published in 1969 in English and Dutch and held by 153 WorldCat member libraries worldwide

The Solar spectrum : proceedings of the symposium held at the University of Utrecht, 26-31 August, 1963 by C. de Jager( )

22 editions published between 1965 and 2013 in English and held by 119 WorldCat member libraries worldwide

A good deal of our information on solar physics and on solar phenomena is derived from the solar spectrum. A quantitative interpretation of this spectrum was only possible after 1920, after the establishment of Bohr's atomic model, the discovery of Saha's law, and the development of spectrophotometry. The resolving and light gathering powers of our instruments have greatly increased since. We have seen an enormous progress in our theoretical under standing of basic atomic phenomena, and of the intricate problems concerned with the transfer of energy through a complicated structure like the sun's outer layers. In particular the observable part of the solar spectrum tremen dously enlarged since the introduction, in the years after 1945, of radio astronomy, enabling us to study the solar spectrum between wavelengths of some mm to about 15 m, of space research, giving access to the whole electro magnetic spectrum below 3000 A, down to about 0. 01 A. Further, the low and high energetic components of the solar particles spectrum have been dis covered with space probes (the solar wind), rockets, balloons (the so-called sub cosmic-ray particles) and cosmic ray monitors (solar cosmic ray bursts). The extreme wealth of this spectrum, much vaster in extent than the earlier investigators could only dream of, is an important source of information. It looked appropriate to us, after the rapid development of this branch of science, ' to invite the world's leading solar physicists to Utrecht for a summa rizing symposium on the whole solar spectrum
Solar flares and collisions between current-carrying loops : types and mechanisms of solar flares and coronal loop heating by Jun'ichi Sakai( )

9 editions published in 1996 in English and held by 109 WorldCat member libraries worldwide

This book links the recent high-resolution observations of solar plasma loops with simulations of current-carrying loops and thus tries to arrive at an understanding of the solar flare phenomenon. It elaborates on a new scheme for the classification of solar flares and compares specific observed flares with theoretical calculations and simulations. It describes and explains the true phases of acceleration in flares
Progress in solar physics : review papers invited to celebrate the centennial volume of Solar physics by C. de Jager( )

9 editions published between 1985 and 1986 in English and held by 108 WorldCat member libraries worldwide

Instabilities in evolved super- and hypergiants by C. de Jager( Book )

12 editions published between 1992 and 1993 in English and Undetermined and held by 88 WorldCat member libraries worldwide

Solar-terrestrial physics 1970; proceedings of the International Symposium on Solar-Terrestrial Physics held in Leningrad, U.S.S.R. 12-19 May 1970 by C. de Jager( )

8 editions published in 1972 in English and held by 63 WorldCat member libraries worldwide

This volume contains the review papers presented at the International Symposium on Solar-Terrestrial Physics held at the Tavrichesky Palace, Leningrad, U.S.S.R., 11-19 May 1970. The Symposium may be regarded as the most recent member of a series of inter­ national symposia - for instance, the Symposium on Solar-Terrestrial Physics, Belgrade (1966), the Joint IQSY-COSPAR Symposium on Solar-Terrestrial Physics, London (1967), and the Symposium on the Physics of the Magnetosphere, Washington (1968). Like those earlier symposia, the Leningrad Symposium was sponsored by the International Astronomical Union (IAU), the International Union of Geodesy and Geophysics (IUGG), the International Union of Radio Sciences (URSI), and the ICSU Committee on Space Research (COSPAR). These bodies are all concerned with one or another aspect of solar-terrestrial physics, and all joined in believing that the time was ripe for another comprehensive symposium on all aspects of this very active field of research
Reports on astronomy by International Astronomical Union( Book )

13 editions published between 1970 and 1973 in 3 languages and held by 59 WorldCat member libraries worldwide

The physics of solar flares : proceedings of symposium 5 of the COSPAR Twenty-sixth Plenary Meeting held in Toulouse, France, 30th June-11th July by COSPAR( Book )

7 editions published between 1986 and 1987 in English and held by 55 WorldCat member libraries worldwide

Highlights of Astronomy : As presented at the XIVth General Assembly of the I.A.U. 1970 by C. de Jager( )

3 editions published in 1971 in English and held by 53 WorldCat member libraries worldwide

After the same pattern as the XIII th General Assembly of the International Astronom ical Union the present Volume of the Highlights in Astronomy contains the texts of the invited discourses given at the XIVth General Assembly held in Brighton, England, August 1970. It contains further the papers and discussion remarks presented at the six joint discussions, as well as the invited papers given at the special session on the Moon. In addition this Volume contains the papers given at the joint meeting of Commissions 24, 27, 30, 33 and 37 on RR Lyrae Stars. It goes without saying that the nearly hundred papers printed in this Volume represent only a minor part of all matter dealt with at the XIVth General Assembly of the Union; the many important discussions that took place in a few hundred commission meetings are not included. For short abstracts and reviews of these the reader is referred to Transactions of the International Astronomical Union XIVB. I wish to thank those who contributed to this Volume for the speed in submitting the manuscripts of their papers. This, together with the efficiency of the Publishers allowed for a rapid publication
Transactions of the International Astronomical Union Volume XVA : Reports on Astronomy by C. de Jager( )

2 editions published in 1973 in English and held by 49 WorldCat member libraries worldwide

This volume contains the fifteenth tri-annual reports of the Presidents of the forty Commissions of the International Astronomical Union; it refers to the progress in our discipline during the three years 1970, 1971 and 1972. As compared to earlier volumes a gradual change in character is unmistakable. The ever increasing flow of publications, combined with the obvious necessity to keep the Reports at a reasonable size and price level has gradually forced the Commission Presidents to be more selective than before in drafting their Reports. I have certainly stimulated them into that direction - in order that Reports like these be valuable and lasting, it seems imperative that the individual contributions have the character of a critical overall review, where a fairly complete summary is given of the major develop ments and discoveries of the past three years, and in which the broad developments and new trends be clearly outlined, while at the same time essential problems for future research are identified. With respect to the latter item I have suggested the Commission Presidents to add to their reports a brief section on scientific priorities for future research in the field of their Commissions. In order to save space I have suggested to Commission Presidents that references to published papers are given on the basis of their number in the published issues of Astronomy and Astrophysics Abstracts. For instance, the indication (06. 078. 019) or (AAA 06. 078
The hydrogen spectrum of the sun by C. de Jager( Book )

9 editions published in 1952 in English and held by 40 WorldCat member libraries worldwide

Ontstaan en levensloop van sterren by C. de Jager( Book )

9 editions published between 1955 and 1984 in Dutch and Undetermined and held by 38 WorldCat member libraries worldwide

A discussion of short-lived solar radio transients at 200 Mc/s by C. de Jager( Book )

6 editions published between 1957 and 1958 in English and held by 32 WorldCat member libraries worldwide

Proceedings of the fourteenth General Assembly, Brighton, 1970 by International Astronomical Union( Book )

4 editions published in 1971 in English and Undetermined and held by 29 WorldCat member libraries worldwide

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Image processing techniques in astronomy : proceedings of a conference held in Utrecht on March 25-27, 1975
The Structure of the quiet photosphere and the low chromosphere. Proceedings of the 'Bilderberg' conference held near Arnhem, Holland, April 17-21, 1967Image processing techniques in astronomy : proceedings of a conference held in Utrecht on March 25-27, 1975Reports on astronomy
Alternative Names
Âger, K. de.

Cornelis de Jager astronom

Cornelis de Jager astronom holandez

Cornelis de Jager astrònom neerlandès

Cornelis de Jager astronome hollandais

Cornelis de Jager astrónomo neerlandés

Cornelis de Jager Dutch astronomer

Cornelis de Jager Nederlands astronoom, pionier van het ruimteonderzoek, popularisator van wetenschap en bestrijder van pseudowetenschap

Cornelis de Jager niederländischer Astronom

De Jager C.

De Jager, C. 1921-

De Jager, C. (Cornelis), 1921-

De Jager, Cees

De Jager, Cees 1921-

De Jager Cornelis

De Jager, Cornelis 1921-

De Jager, K.

De Jager, Kees

DeJager, Cees 1921-

DeJager, Cornelis 1921-

Jager C. de

Jager, C. de 1921-

Jager, C. de (Cornelis de), 1921-

Jager, Cees de

Jager, Cees de 1921-

Jager, Cornelis de

Jager, Cornelis de 1921-

Jager, K. de.

Jager, Kees de 1921-

Де Ягер, Корнелис

Корнеліс де Ягер

كورنيليس دي جاجر عالم فلك هولندي



English (178)

Dutch (10)

Italian (2)

Russian (2)

German (1)