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- Publications
- Influence
An empirical determination of the polytropic index for the free‐streaming solar wind using Helios 1 data
- T. Totten, J. Freeman, S. Arya
- Physics
- 1995
Observations of solar wind proton temperatures indicate that the solar wind is heated as it moves outward toward the orbit of Earth. This heating, which may be the result of electron heat conduction… Expand
Viscoelastic properties of human skin and processed dermis
- F. Silver, J. Freeman, D. Devore
- Materials Science, Medicine
- Skin research and technology : official journal…
- 1 February 2001
Background/aims: The purpose of this work is to attempt to determine the elastic spring constant for collagen and elastic fibers (elastin) in skin and to detemine if the values of these elastic… Expand
Kp forecast models
- S. Wing, J. Johnson, +7 authors K. Takahashi
- Environmental Science, Geology
- 1 April 2005
[1] Magnetically active times, e.g., Kp > 5, are notoriously difficult to predict, precisely the times when such predictions are crucial to the space weather users. Taking advantage of the routinely… Expand
Solar wind proton temperature‐velocity relationship
- Ramón López, J. Freeman
- Physics
- 1 February 1986
Data from Helios 1 are examined to find an experimental fit for the T(V) relationship at 1 AU. The data show a distinct change in the proton temperature-velocity slope at V ∼ 500 km s−1. For V > 500… Expand
Lunar electric fields, surface Potential and Associated Plasma Sheaths
- J. Freeman, M. Ibrahim
- Physics
- 1 September 1975
This paper reviews the electric field environment of the Moon. Lunar surface electric potentials are reported as follows:Solar Wind - Dayside: øo + 10 to + 18 VSolar Wind - Terminator: øo ç − 10 to −… Expand
Application of the empirically derived polytropic index for the solar wind to models of solar wind propagation
- T. Totten, J. Freeman, S. Arya
- Geology
- 1 July 1996
An empirically derived polytropic index for the solar wind is applied to two magnetohydrodynamic models of solar wind propagation. The first of these models is time-independent and can be used to… Expand
Partial t-spreads and group constructible (s,r,μ)-nets
- D. A. Drake, J. Freeman
- Mathematics
- 1 September 1979
We give a method for constructing (s,r,μ)-nets out of partial t-spreads. As one consequence, we are able to apply a theorem of Bose and Bush to improve the known upper bound for the number of… Expand
Estimates of solar wind velocity gradients between 0.3 and 1 AU based on velocity probability distributions from Helios 1 at perihelion and aphelion
- S. Arya, J. Freeman
- Physics
- 1 August 1991
We have estimated the average velocity gradients for the solar wind protons by comparing the velocity probability distributions at 0.3 and at 1 AU Assuming a power law radial dependence, we find, for… Expand
Estimates of solar wind heating inside 0.3 AU
- J. Freeman
- Physics
- 1988
We normalize the Helios 1 proton temperature data to 0.3 AU to establish a base temperature-velocity curve at that distance and ask what solar wind heating rates, versus velocity, closer to the sun,… Expand
The morphology of the electron distribution in the outer radiation zone and near the magnetospheric boundary as observed by Explorer 12
- J. Freeman
- Physics
- 1 May 1964
The elliptic orbit satellite Explorer 12 made possible the routine survey of the heart of the outer radiation zone as well as the region of transition between the magnetosphere and interplanetary… Expand
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