排序方式： 共有29条查询结果，搜索用时 15 毫秒
1.
REGIONAL DEMOGRAPHIC STRUCTURE OF THE UNITED STATES 总被引：1，自引：0，他引：1
Richard L. Morrill 《The Professional geographer》1990,42(1):38-53
This paper analyzes the surprisingly great variation in demographic character across the states, utilizing data on fertility, mortality, age, sex, mobility, household character, abortion, race and ethnicity. A fairly simple regional pattern is revealed that is less related to levels of economic development than to long-standing historical cultural differences. 相似文献
2.
3.
As part of a program to estimate the solar spectrum back to the early twentieth century, we have generated fits to UV spectral
irradiance measurements from 1 – 410 nm. The longer wavelength spectra (150 – 410 nm) were fit as a function of two solar
activity proxies, the Mg ii core-to-wing ratio, or Mg ii index, and the total Ca ii K disk activity derived from ground based observations. Irradiance spectra at shorter wavelengths (1 – 150 nm) where used
to generate fits to the Mg ii core-to-wing ratio alone. Two sets of spectra were used in these fitting procedures. The fits at longer wavelengths (150
to 410 nm) were derived from the high-resolution spectra taken by the Solar Ultraviolet Spectral Irradiance Monitor (SUSIM)
on the Upper Atmospheric Research Satellite (UARS). Spectra measured by the Solar EUV Experiment (SEE) instrument on the Thermosphere Ionosphere Mesosphere Energetics and Dynamics (TIMED) satellite were used for the fits at wavelengths from 1 to 150 nm. To generate fits between solar irradiance and solar
proxies, this study uses the above irradiance data, the NOAA composite Mg ii index, and daily Ca ii K disk activity determined from images measured by Big Bear Solar Observatory (BBSO). In addition to the fitting coefficients
between irradiance and solar proxies, other results from this study include an estimated relationship between the fraction
of the disk with enhanced Ca ii K activity and the Mg ii index, an upper bound of the average solar UV spectral irradiance during periods where the solar disk contains only regions
of the quiet Sun, as was believed to be present during the Maunder Minimum, as well as results indicating that slightly more
than 60% of the total solar irradiance (TSI) variability occurs between 150 and 400 nm. 相似文献
4.
J. S. Morrill C. M. Korendyke G. E. Brueckner F. Giovane R. A. Howard M. Koomen D. Moses S. P. Plunkett A. Vourlidas E. Esfandiari N. Rich D. Wang A. F. Thernisien P. Lamy A. Llebaria D. Biesecker D. Michels Q. Gong M. Andrews 《Solar physics》2006,233(2):331-372
We present a detailed review of the calibration of the LASCO C3 coronagraph on the SOHO satellite. Most of the calibration
has been in place since early in the mission and has been utilized to varying degrees as required by specific analysis efforts.
However, using observational data from the nearly decade-long database of LASCO images, we have re-evaluated and improved
many aspects of the calibration. This includes the photometric calibration, vignetting function, geometric distortion, stray
light, and exposure and observation times. Using this comprehensive set of corrections we have generated and made available
a set of calibrated coronal images along with a set of periodic background images to ease the accessibility and use of the
LASCO database.
Deceased 相似文献
5.
6.
7.
8.
Richard Morrill 《The Professional geographer》1985,37(3):263-270
9.
10.
Korendyke C.M. Vourlidas A. Cook J.W. Dere K.P. Howard R.A. Morrill J.S. Moses J.D. Moulton N.E. Socker D.G. 《Solar physics》2001,200(1-2):63-73
The Very-high-resolution Advanced ULtraviolet Telescope (VAULT) experiment was successfully launched on 7 May 1999 on a Black Brant sounding rocket vehicle from White Sands Missile Range. The instrument consists of a 30 cm UV diffraction limited telescope followed by a two-grating, zero-dispersion spectroheliograph tuned to isolate the solar L emission line. During the flight, the instrument successfully obtained a series of images of the upper chromosphere with a limiting resolution of 0.33 arc sec. The resulting observations are the highest-resolution images of the solar atmosphere obtained from space to date. The flight demonstrated that sub-arc second ultraviolet images of the solar atmosphere are achievable with a high-quality, moderate-aperture space telescope and associated optics. Herein, we describe the payload and its in-flight performance. 相似文献