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Papers by argo far

Atmospheric Environment, 2004

... REFERENCES Holden, DN, CP Munson, and JC Devenport, Satellite observations of transionospheri... more ... REFERENCES Holden, DN, CP Munson, and JC Devenport, Satellite observations of transionospheric pulse pairs, Geophys. Res. ... Willett, JC, JC Bailey, and EP Krider, A class of unusual lightning electric field waveforms with very strong high-frequency radiation, J. Geophys. ...

The High Resolution Airglow and Aurora Spectroscopy (HIRAAS) experiment was successfully launched... more The High Resolution Airglow and Aurora Spectroscopy (HIRAAS) experiment was successfully launched on the USAF Advanced Research and Global Observation Satellite (ARGOS) and continuously monitored the thermospheric and ionospheric airglow from May 1999 through March 2002 using three ultraviolet spectrographs. The High-resolution Ionospheric and Thermospheric Spectrograph (HITS) is a far- and extreme-ultraviolet (FUV/EUV) Rowland circle spectrograph covering the 50-150 nm spectral range at ~0.1 nm resolution in 11-nm passbands. While limb scanning, the HITS measures airglow emissions from 50 to 400 km every 130 seconds. During the mission the HITS stepped through a regular monthly sequence of passbands covering much of its spectral range. The HITS observations represents a uniquely useful dataset: high resolution, altitude-resolved global dayglow spectra. These measurements provide the capability to study new remote sensing techniques using resolved multiplet emissions (OII 83.4 nm), observed Doppler-shifted emissions from proton aurora (HI 121.6nm), and measure temperatures from molecular bandshapes (N2 Lyman-Birge-Hopfield). Moreover, the HITS spectra provide the means to disentangle complicated emission features seen at low resolution, such as NII 108.5nm emission which includes a number of nearby weak contaminating features. This analysis examines the altitude-resolved high resolution dayglow spectra acquired during June, 2000.

The Global Imaging Monitor of the Ionosphere (GIMI) experiment aboard the Advanced Research and G... more The Global Imaging Monitor of the Ionosphere (GIMI) experiment aboard the Advanced Research and Global Observation Satellite (ARGOS) includes a gimbaled far-ultraviolet camera capable of both astronomical and airglow observations. When trained on the atmosphere at a fixed look zenith angle, GIMI performs half-orbit imaging of the nightglow appropriate for tomographic retrieval. On the July 12, 1999 GIMI observed one, and then two horizontally separated, spatially compact regions of substantially reduced 1356 Å emission amid and otherwise unremarkable nightglow signature. Because nighttime 1356 Å radiation is produced by O++e- recombination, the observed columns of reduced emission correspond to regions of ionospheric depletion. Nearly simultaneous observations by another ARGOS instrument, the Low Resolution Airglow and Auroral Spectrograph (LORAAS), can provide independent vertical and in-track ionospheric density profiles. LORAAS observations have frequent (5.6° in-track) soundings and spectral information, complementing the more infrequent GIMI image sequences that provide vertical, in-track, and cross-track measurements integrated over its filter passband. The sequence of GIMI images will be analyzed in conjunction with LORAAS data to produce a three-dimensional tomographic map of the extended depletion region. The ionosphere map will be compared to models of localized ionospheric depletions.

The Global Imaging Monitor of the Ionosphere (GIMI) is one of nine scientific instruments aboard ... more The Global Imaging Monitor of the Ionosphere (GIMI) is one of nine scientific instruments aboard the Advanced Research and Global Observation Satellite (ARGOS) to be launched into polar orbit in early 1998. As its name implies, the primary objective of GIMI is remote sensing of the ionosphere and upper neutral atmosphere, through imaging of airglow emissions and stellar occultations. However, it also has objectives in ultraviolet astronomy, including all-sky surveys of point and diffuse sources in the 92-110, 135-160, and 135-200 nm wavelength ranges. GIMI consists of two electron-bombarded CCD cameras with 10-degree-square fields of view and 1 mrad angular resolution, mounted on a two-axis gimbal. The GIMI camera #1, sensitive in the 92-110 nm range, will obtain the first large-area starfield imaging survey in the below-Lyman-alpha wavelength range. The #2 camera will image diffuse sources (nebulae and diffuse background radiation) to fainter levels and over larger areas of the sky than previous investiga tions in the longer wavelength ranges. It is expected that all-sky surveys in each wavelength range, as well as deeper exposures on targets of special interest, will be achievable in the nominal one-year mission duration.

Comptes Rendus De L Academie Des Sciences Serie Iii-sciences De La Vie-life Sciences, 2000

The NRL-801, USA) experiment and other systems on the ARGOS (P91-1) satellite to be launched in 1... more The NRL-801, USA) experiment and other systems on the ARGOS (P91-1) satellite to be launched in 1995 can be used as a testbed for satellite navigational techniques, to explore unconventional means of measuring a satellite's position, velocity, acceleration, attitude and the local time. One way this is done is with measurements made using x-ray sensors. Parameters can be estimated onboard and verified through redundant determinations. The ARGOS satellite is being built under the Air Force Space Test Program. It carries eight experiments, three of which utilize far-ultraviolet (FUV) or extreme-ultraviolet (EUV) sensors and one of which (NRL-801) is an x-ray sensor. Among the ARGOS experiments NRL-801 uniquely has satellite navigation experiments as one of its prime objectives, with special design features supporting that purpose.

Nuclear Physics B-proceedings Supplements, 2008

The ARGOS satellite includes two Naval Research Laboratory experiments that monitor naturally occ... more The ARGOS satellite includes two Naval Research Laboratory experiments that monitor naturally occurring far ultraviolet emissions in the Earth's upper atmosphere. Coincident observations between these two instruments, the Global Imaging Monitor of the Ionosphere (GIMI) and the Low Resolution Airglow and Auroral Spectrograph (LORAAS), have been obtained. The GIMI instrument produces 9 ° x 9 ° limb images with passband coverage between 131 and 200 nm. The LORAAS instrument provides the spectral distribution from 80 to 170 nm for 2.4 ° x 17 ° field of regard. The two instruments are coaligned aboard the spacecraft, aft-looking in the orbital plane. Preliminary comparisons of observations obtained from the imaging and scanning instruments under quiet geomagnetic conditions are reported, including irradiances and spectral distributions. By combining the GIMI data with that from LORAAS, the study of the dynamics of the ionosphere can be expanded to investigate both horizontal and vertical distrubutions and their variances. The improved capability can extend to the study of active periods with highly variable and disturbed ionospheres, and examples are discussed from data acquired during periods of high geomagnetic activity. These results provide the first direct comparison between near simultaneous limb scans and images from ARGOS, and show promise as a validation technique to improve capabilities for the study of ionospheric variability.

Expert Systems With Applications, 2008

This paper presents an efficient technique for analyzing ARGO ocean data comprising time series o... more This paper presents an efficient technique for analyzing ARGO ocean data comprising time series of salinity/temperature measurements where informative salinity/temperature patterns are extracted. Most traditional mining techniques focus on finding associations among items within one transaction and are therefore unable to discover rich contextual patterns related to location and time. In order to show the associated salinity/temperature variations among different

Journal of Arachnology, 2005

Thermospheric temperature can be inferred from the rotational temperature of N2 in far-ultraviole... more Thermospheric temperature can be inferred from the rotational temperature of N2 in far-ultraviolet Lyman-Birge-Hopfied (LBH) emission, if the band shapes are measured with sufficient spectral resolution. Temperature may also be estimated from the scale height of LBH emission in limb scanning observations, but scale height temperatures can be affected by departures from diffusive equilibrium. The Advanced Research and Global Observations Satellite (ARGOS), launched February 1999, includes the High-resolution Ionospheric and Thermospheric Spectrograph (HITS), a far-ultraviolet sensor with 1-Å resolution well-suited to measure global N2 temperatures. The Low Resolution Airglow and Aurora Spectrograph (LORAAS), an 18-Å resolution far-ultraviolet limb scanner, is coaligned with HITS and operates simultaneously. Rotational temperature retrievals from the LBH (1-1) band will be compared to temperatures retrieved from atmospheric, excitation, and radiative transfer modeling of LBH limb scans. We will evaluate the two methods, compare results to thermospheric model predictions, and search for differences between rotational and scale-height temperatures.

Thermospheric temperature can be inferred from the rotational temperature of N2 in far-ultraviole... more Thermospheric temperature can be inferred from the rotational temperature of N2 in far-ultraviolet Lyman-Birge-Hopfied (LBH) emission, if the band shapes are measured with sufficient spectral resolution. The Advanced Research and Global Observations Satellite (ARGOS), launched February 1999, includes the High-resolution Ionospheric and Thermospheric Spectrograph (HITS), a far-ultraviolet sensor with 1-Å resolution well-suited to measure global N2 temperatures. Owing to the low sensitivity of HITS, many spectra include bins with low numbers of photon counts. Consequently, standard χ2 minimization techniques cannot accurately fit band shapes, since Poisson rather than Gaussian statistics apply. Approaches for temperature retrievals using the LBH (1-1) band are presented that properly address the statistical difficulties. One technique rebins the band into two colors, then derives effective temperature from a color ratio; the other two methods retrieve temperature from the band shape using Levenberg-Marquardt C-statistic minimization. Effective thermospheric temperature and exospheric temperature are derived from HITS 200 km stare spectra acquired June 25, 2000 using these techniques. MSIS temperature estimates at 200 km are higher than temperatures derived from HITS by ~140 K (latitudinally-averaged).

The Global Imaging Monitor of the Ionosphere (GIMI) experiment aboard the Advanced Research and G... more The Global Imaging Monitor of the Ionosphere (GIMI) experiment aboard the Advanced Research and Global Observation Satellite (ARGOS) includes a gimbaled far-ultraviolet camera capable of both astronomical and airglow observations. When trained on the atmosphere at a fixed look zenith angle, GIMI performs half-orbit imaging of the nightglow appropriate for tomographic retrieval. On the July 12, 1999 GIMI observed one, and then two horizontally separated, spatially compact regions of substantially reduced 1356 Å emission amid and otherwise unremarkable nightglow signature. Because nighttime 1356 Å radiation is produced by O++e- recombination, the observed columns of reduced emission correspond to regions of ionospheric depletion. Nearly simultaneous observations by another ARGOS instrument, the Low Resolution Airglow and Auroral Spectrograph (LORAAS), can provide independent vertical and in-track ionospheric density profiles. LORAAS observations have frequent (5.6° in-track) soundings and spectral information, complementing the more infrequent GIMI image sequences that provide vertical, in-track, and cross-track measurements integrated over its filter passband. The sequence of GIMI images will be analyzed in conjunction with LORAAS data produce a three-dimensional tomographic map of the extended depletion region. The ionosphere map will be compared to models of localized ionospheric depletions.

Russian Journal of Plant Physiology, 2011

The auxin-inducible gene ARGOS from Arabidopsis thaliana is expressed in growing tissues and cont... more The auxin-inducible gene ARGOS from Arabidopsis thaliana is expressed in growing tissues and controls the plant organ size by regulating cell proliferation and meristematic competence. The promoter of the dahlia (Dahlia pinnata Cav.) mosaic virus (DMV) resembles the well-known cauliflower mosaic virus 35S promoter but shows a higher activity in transgenic tobacco plants (Nicotiana tabacum L.). We obtained transgenic tobacco plants expressing the Arabidopsis ARGOS gene under the control of the DMV promoter. Several of the T0 generation plants exhibited an accelerated transition to flowering, a slight increase in flower size, and a significant increase in the leaf size. The T1 transgenic plants were characterized by faster growth, the increased leaf size, and somewhat enlarged flowers as compared with control plants. These phenotypic traits, as well as stability and inheritance of the transgene were demonstrated also in T2 transgenic plants.

Operating Systems Review, 2006

The Global Imaging Monitor of the Ionosphere (GIMI) is one of the scientific instruments aboard t... more The Global Imaging Monitor of the Ionosphere (GIMI) is one of the scientific instruments aboard the Department of Defense's Advanced Research and Global Observation Satellite (ARGOS). GIMI contains two far-ultraviolet electron- bombarded CCD (EBCCD) cameras, with 9 degree(s)-square fields of view. GIMI is intended for far-UV imagery of upper atmospheric and ionospheric airglow and auroras, occultations of UV-bright stars by the neutral upper atmosphere, and deep-space celestial objects and diffuse far-UV background. To obtain quantitative information from the images, an extensive program of calibrations, prior to launch and in-orbit, was required. Laboratory calibrations before launch consisted of imaging monochromatic laboratory UV light sources whose integrated intensities were monitored by separately calibrated photon-counting detectors. The in- flight calibrations involved observations of UV-bright starts, for which previously obtained and calibrated UV- bright stars, for which previously obtained and calibrated UV spectra exist from previous UV astronomy satellites (such as OAO-2 and IUE). We describe the procedures used in obtaining data for calibration purposes, and for reducing and analyzing the calibration data. We also discuss procedures and results for determining the absolute sensitivities, and their variations with wavelength, position in the field of view, and on-orbit time during the ARGOS mission.

Journal of Forensic and Legal Medicine, 2009

Primary tumors of the heart in infants and children are rare. The types of heart tumors in pediat... more Primary tumors of the heart in infants and children are rare. The types of heart tumors in pediatric age groups are generally different from those in adults. Cardiac myxoma is by far the most common tumor in adults, but in infants and adolescents the prevalent tumor of the heart is rhabdomyoma. Among benign cardiac tumors, cardiac hemangiomas are rare and often diagnosed post-mortem due to the lack of specific clinical symptoms and signs. We report a case of sudden death due to cardiac hemangioma in an apparently healthy 15-year-old adolescent. The autopsy revealed a cardiac hemangioma located at the apex of the heart; the histopathological examination showed the tumor was a mixed capillary and arteriolar hemangioma, a very rare type of primary tumor in adolescents.

Atmospheric Environment, 2004

Comptes Rendus De L Academie Des Sciences Serie Iii-sciences De La Vie-life Sciences, 2000

Nuclear Physics B-proceedings Supplements, 2008

Expert Systems With Applications, 2008

Journal of Arachnology, 2005

Thermospheric temperature can be inferred from the rotational temperature of N2 in far-ultraviole... more Thermospheric temperature can be inferred from the rotational temperature of N2 in far-ultraviolet Lyman-Birge-Hopfied (LBH) emission, if the band shapes are measured with sufficient spectral resolution. The Advanced Research and Global Observations Satellite (ARGOS), launched February 1999, includes the High-resolution Ionospheric and Thermospheric Spectrograph (HITS), a far-ultraviolet sensor with 1-Å resolution well-suited to measure global N2 temperatures. Owing to the low sensitivity of HITS, many spectra include bins with low numbers of photon counts. Consequently, standard χ2 minimization techniques cannot accurately fit band shapes, since Poisson rather than Gaussian statistics apply. Approaches for temperature retrievals using the LBH (1-1) band are presented that properly address the statistical difficulties. One technique rebins the band into two colors, then derives effective temperature from a color ratio; the other two methods retrieve temperature from the band shape using Levenberg-Marquardt C-statistic minimization. Effective thermospheric temperature and exospheric temperature are derived from HITS 200 km stare spectra acquired June 25, 2000 using these techniques. MSIS temperature estimates at 200 km are higher than temperatures derived from HITS by ~140 K (latitudinally-averaged).

The Global Imaging Monitor of the Ionosphere (GIMI) experiment aboard the Advanced Research and G... more The Global Imaging Monitor of the Ionosphere (GIMI) experiment aboard the Advanced Research and Global Observation Satellite (ARGOS) includes a gimbaled far-ultraviolet camera capable of both astronomical and airglow observations. When trained on the atmosphere at a fixed look zenith angle, GIMI performs half-orbit imaging of the nightglow appropriate for tomographic retrieval. On the July 12, 1999 GIMI observed one, and then two horizontally separated, spatially compact regions of substantially reduced 1356 Å emission amid and otherwise unremarkable nightglow signature. Because nighttime 1356 Å radiation is produced by O++e- recombination, the observed columns of reduced emission correspond to regions of ionospheric depletion. Nearly simultaneous observations by another ARGOS instrument, the Low Resolution Airglow and Auroral Spectrograph (LORAAS), can provide independent vertical and in-track ionospheric density profiles. LORAAS observations have frequent (5.6° in-track) soundings and spectral information, complementing the more infrequent GIMI image sequences that provide vertical, in-track, and cross-track measurements integrated over its filter passband. The sequence of GIMI images will be analyzed in conjunction with LORAAS data produce a three-dimensional tomographic map of the extended depletion region. The ionosphere map will be compared to models of localized ionospheric depletions.

Russian Journal of Plant Physiology, 2011

Operating Systems Review, 2006

Journal of Forensic and Legal Medicine, 2009