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J. H. Hoffman

United States Naval Research Laboratory

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Featured researches published by J. H. Hoffman.

Science | 1967

Composition Measurements of the Topside Ionosphere

J. H. Hoffman

Data from a magnetic mass spectrometer flown on the Explorer 31 satellite show that the ionosphere above 1000 kilometers usually consists of hydrogen ions as the predominant species. Between this altitude and perigee (500 kilometers) the dominant ion species shifts to atomic oxygen, with a significant amount of atomic nitrogen ions also present. Helium ions are present in small quantities at all altitudes. Other minor ions observed are those of 2, 7, 8, 15, 18, and 20 atomic mass units.

Journal of Geophysical Research | 1964

Neutral composition of the atmosphere in the 100- to 200-kilometer range

Alfred O. Nier; J. H. Hoffman; Charles Y. Johnson; J. C. Holmes

Journal of Geophysical Research | 1975

The N I (5200 Å) dayglow

David W. Rusch; A. I. F. Stewart; P. B. Hays; J. H. Hoffman

Journal of Geophysical Research | 1969

Daytime midlatitude ion composition measurements

J. H. Hoffman; Charles Y. Johnson; J. C. Holmes; J. M. Young

Journal of Geophysical Research | 1979

An experimental and theoretical study of the mean diurnal variation of O+, NO+, O2 +, and N2 + ions in the mid‐latitude F 1 layer of the ionosphere

D. G. Torr; Marsha R. Torr; H. C. Brinton; L. H. Brace; N. W. Spencer; A.E. Hedin; W. B. Hanson; J. H. Hoffman; Alfred O. Nier; J. C. G. Walker; David W. Rusch

Science | 1956

Effect of Sensory Deprivation on Learning Rate in Human Beings

Jack Vernon; J. H. Hoffman

Journal of Geophysical Research | 1979

An experimental and theoretical study of the mean diurnal variation of O/+/, NO/+/, O2/+/, and N2/+/ ions in the mid-latitude F1 layer of the ionosphere

D. G. Torr; Marsha R. Torr; H. C. Brinton; L. H. Brace; N. W. Spencer; A.E. Hedin; W. B. Hanson; J. H. Hoffman; Alfred O. Nier; J. C. G. Walker

Journal of Geophysical Research | 1977

Determination of the rate coefficient for the N2 + + O Reaction in the ionosphere

D. G. Torr; N. Orsini; Marsha R. Torr; W. B. Hanson; J. H. Hoffman; J. C. G. Walker

Journal of Geophysical Research | 1977

Doubly charged atomic oxygen ions in the thermosphere, 1. Photochemistry

E. L. Breig; Marsha R. Torr; D. G. Torr; W. B. Hanson; J. H. Hoffman; J. C. G. Walker; A. O. Nier

Journal of Geophysical Research | 1967

A mass spectrometric determination of the composition of the nighttime topside ionosphere

J. H. Hoffman

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W. B. Hanson

University of Texas at Dallas

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Marsha R. Torr

Marshall Space Flight Center

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Alfred O. Nier

University of Minnesota

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D. G. Torr

Utah State University

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David W. Rusch

University of Colorado Boulder

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J. C. G. Walker

Yale University

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Charles Y. Johnson

United States Naval Research Laboratory

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J. C. Holmes

United States Naval Research Laboratory

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H. C. Brinton

Goddard Space Flight Center

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L. H. Brace

Goddard Space Flight Center

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