Lightning Threat Analysis for the Space Shuttle Launch Pad and the Payload Changeout Room Using Finite Difference Methods

This report describes finite difference computer calculations for the Space Shuttle Launch Pad which predict lightning induced electric currents and electric and magnetic fields caused by a lightning strike to the Lightning Protection System caternary wire. Description of possible lightning threats to Shuttle Payload components together with specifications for protection of these components, result from the calculation of lightning induced electric and magnetic fields inside and outside the during a lightning event. These fields also induce currents and voltages on cables and circuits which may be connected to, or a part of, shuttle payload components. These currents and voltages are also calculated. These threat levels are intended as a guide for designers of payload equipment to specify any shielding and/or lightning protection mitigation which may be required for payload components which are in the process of preparation or being transferred into the Shuttle Orbiter

Evaluating lightning hazards to building environments using explicit numerical solutions of Maxwell's equations

The objective here is to describe the lightning hazards to buildings and their internal environments using advanced formulations of Maxwell's Equations. The method described is the Three Dimensional Finite Difference Time Domain Solution. It can be used to solve for the lightning interaction with such structures in three dimensions with the inclusion of a considerable amount of detail. Special techniques were developed for including wire, plumbing, and rebar into the model. Some buildings have provisions for lightning protection in the form of air terminals connected to a ground counterpoise system. It is shown that fields and currents within these structures can be significantly high during a lightning strike. Time lapse video presentations were made showing the electric and magnetic field distributions on selected cross sections of the buildings during a simulated lightning strike

Laminar-flow flight experiments

The flight testing conducted over the past 10 years in the NASA laminar-flow control (LFC) will be reviewed. The LFC program was directed towards the most challenging technology application, the high supersonic speed transport. To place these recent experiences in perspective, earlier important flight tests will first be reviewed to recall the lessons learned at that time

Lightning Effects in the Payload Changeout Room

Analytical and empirical studies have been performed to provide better understanding of the electromagnetic environment inside the Payload Changeout Room and Orbiter payload bay resulting from lightning strikes to the launch pad lightning protection system. The analytical studies consisted of physical and mathematical modeling of the pad structure and the Payload Changeout Room. Empirical testing was performed using a lightning simulator to simulate controlled (8 kA) lightning strikes to the catenary wire lightning protection system. In addition to the analyses and testing listed above, an analysis of the configuration with the vehicle present was conducted, in lieu of testing, by the Finite Difference, Time Domain method

Long-Term Monitoring Of A High-Latitude Coral Reef System Off Southeast Florida, Usa: A Partnership Between Academia And Resource Management

Significant coral reef community development exists along the eastern shelf of the United States from the Dry Tortugas through the Florida Keys (Monroe County) and Southeast (SE) Florida (Miami-Dade, Broward, Palm Beach, and Martin Counties). State and county resource managers have partnered with academia to monitor the health of the SE Florida reef system. Since 2000, more than 20 sites have been monitored annually offshore Broward County. Quantitative data includes stony coral species cover, colony size, density, and condition (bleaching, disease, etc.) and gorgonian and sponge density. The SE Florida Coral Reef Evaluation and Monitoring Project (SECREMP) was established in 2003 as an expansion of the Florida Keys Coral Reef Evaluation and Monitoring Project (CREMP). Thirteen SECREMP sites are monitored annually across the 4 SE Florida counties. The stony coral, gorgonian, sponge, and other functional group cover data collected within the SECREMP sites and the Keys CREMP sites provides status and trend information for the entire Florida reef tract. The SE Florida reef system typically has 2-4% stony coral cover with more than 30 stony coral species and a diverse assemblage of octocoral, sponges, and fishes. Since their inception, monitoring efforts have shown relatively stable levels in stony coral cover and density. However, there have been many impacts to the SE Florida ecosystem resulting from its proximity to the highly developed and urbanized SE Florida coast. These reefs are influenced by many factors including commercial and recreational fishing and diving, major shipping ports, sewer outfalls, ship groundings, and coastal construction activities. SE Florida’s coral reef ecosystems generate $1.1 billion in annual income and support 36,000 jobs in the region. The uniqueness and value of these resources to the community demands sustained cooperative monitoring efforts and increased investigations into limiting environmental/ecological processes

Rapid Response and Restoration for Coral Reef Injuries in Southeast Florida: Guidelines and Recommendations

From the time an injury to coral reef resources is reported, a well-coordinated and implemented plan is critical to the success of response and restoration efforts. There are three major plan components, each of which is equally important: (1) the Initial Response period immediately following notification of the incident; (2) the Response period, during which the Responsible Party (RP) is identified, the Trustees and RP carry out their respective responsibilities, a Primary Restoration plan is developed, authorizations and contractors to conduct restoration activities are sought and obtained, and primary restoration activities are conducted; and (3) the Post-Response period, which is largely a monitoring, compensatory restoration/mitigation, and penalty assessment phase that takes place after primary restoration activities are carried out. The guidelines and recommendations presented in this docuemnt were developed to examine reef injury response processes and to facilitate a rapid response to, and the successful restoration of, southeast Florida reefs. The document was developed as part of a Local Action Strategy (LAS) of the Southeast Florida Coral Reef Initiative (SEFCRI) to develop guidelines and recommendations for a rapid response and restoration process for reef injuries in the SEFCRI region. In February 2006, a two day workshop was held in Fort Lauderdale, Florida, to compile information on existing emergency response processes, identify deficiencies and develop solutions for those processes, and compile information on existing technologies and procedures for triage and the restoration of reef injuries. The first day of the workshop focused on process and policy issues. The second day addressed response, injury and mitigation assessment, restoration and repair, and monitoring. Workshop panelists and attendees included respresentatives from local, state, and federal agencies with proprietary or regulatory authority or jurisdiction over sovereign submerged lands and reef resources located within Florida\u27s waters. Also in attendance were technical and academic experts in the fields of coral reef research, injury assessment, and restoration, as well as marine contractors, private and public attorneys, nongovernmental organizations, and other interested parties. These guidelines and recommendations incorporate information from the combined experience of the workshop attendees, workshop outcomes, published documents, and numerous state and federal regulations, policies, and procedures

WASP-120b, WASP-122b and WASP-123b: Three newly discovered planets from the WASP-South survey

We present the discovery by the WASP-South survey of three planets transiting moderately bright stars (V ~ 11). WASP-120b is a massive (5.0MJup) planet in a 3.6-day orbit that we find likely to be eccentric (e = 0.059+0.025-0.018) around an F5 star. WASP-122b is a hot-Jupiter (1.37MJup, 1.79RJup) in a 1.7-day orbit about a G4 star. Our predicted transit depth variation cause by the atmosphere of WASP-122b suggests it is well suited to characterisation. WASP-123b is a hot-Jupiter (0.92MJup, 1.33RJup) in a 3.0-day orbit around an old (~ 7 Gyr) G5 star.Comment: 15 pages, 10 figures, 5 table

Lunar Surface Electric Potential Changes Associated with Traversals through the Earth's Foreshock

We report an analysis of one year of Suprathermal Ion Detector Experiment (SIDE) Total Ion Detector (TID) resonance events observed between January 1972 and January 1973. The study includes only those events during which upstream solar wind conditions were readily available. The analysis shows that these events are associated with lunar traversals through the dawn flank of the terrestrial magnetospheric bow shock. We propose that the events result from an increase in lunar surface electric potential effected by secondary electron emission due to primary electrons in the Earth's foreshock region (although primary ions may play a role as well). This work establishes (1) the lunar surface potential changes as the Moon moves through the terrestrial bow shock, (2) the lunar surface achieves potentials in the upstream foreshock region that differ from those in the downstream magnetosheath region, (3) these differences can be explained by the presence of energetic electron beams in the upstream foreshock region and (4) if this explanation is correct, the location of the Moon with respect to the terrestrial bow shock influences lunar surface potential