space weather.pdf

Severe Space Weather Events--Understanding Societal and Economic Impacts Workshop Report (Free Executive Summary)

http://www.nap.edu/catalog/12507.html

Free Executive Summary

Severe Space Weather Events--Understanding

Societal and Economic Impacts Workshop Report

Committee on the Societal and Economic Impacts of

Severe Space Weather Events:A Workshop, National

Research Council

ISBN: 978-0-309-12769-1, 131 pages, 8 1/2 x 11, paperback (2008)

This free executive summary is provided by the National Academies as

part of our mission to educate the world on issues of science, engineering,

and health. If you are interested in reading the full book, please visit us

online at http://www.nap.edu/catalog/12507.html . You may browse and

search the full, authoritative version for free; you may also purchase a print

or electronic version of the book. If you have questions or just want more

information about the books published by the National Academies Press,

please contact our customer service department toll-free at 888-624-8373.

The adverse effects of extreme space weather on modern technology--power grid

outages, high-frequency communication blackouts, spacecraft anomalies--are well known

and well documented, and the physical processes underlying space weather are also

generally well understood. Less well documented and understood, however, are the

potential economic and societal impacts of the disruption of critical technological systems

by severe space weather. As a first step toward determining the socioeconomic impacts

of extreme space weather events and addressing the questions of space weather risk

assessment and management, a public workshop was held in May 2008. The workshop

brought together representatives of industry, the government, and academia to consider

both direct and collateral effects of severe space weather events, the current state of the

space weather services infrastructure in the United States, the needs of users of space

weather data and services, and the ramifications of future technological developments for

contemporary society's vulnerability to space weather. The workshop concluded with a

discussion of un- or underexplored topics that would yield the greatest benefits in space

weather risk management.  

This executive summary plus thousands more available at www.nap.edu.

indicated, all materials in this PDF file are copyrighted by the National Academy of

Sciences. Distribution or copying is strictly prohibited without permission of the National

Academies Press http://www.nap.edu/permissions/ Permission is granted for this material

to be posted on a secure password-protected Web site. The content may not be posted

on a public Web site.

Severe Space Weather Events--Understanding Societal and Economic Impacts Workshop Report

http://books.nap.edu/catalog/12507.html

Summary

SOCIETAL CONTEXT

Modern society depends heavily on a variety of technologies that are susceptible to the extremes of space

weather—severe disturbances of the upper atmosphere and of the near-Earth space environment that are driven by

the magnetic activity of the Sun. Strong auroral currents can disrupt and damage modern electric power grids and

may contribute to the corrosion of oil and gas pipelines. Magnetic storm-driven ionospheric density disturbances

interfere with high-frequency (HF) radio communications and navigation signals from Global Positioning System

(GPS) satellites, while polar cap absorption (PCA) events can degrade—and, during severe events, completely black

out—HF communications along transpolar aviation routes, requiring aircraft flying these routes to be diverted to

lower latitudes. Exposure of spacecraft to energetic particles during solar energetic particle events and radiation

belt enhancements can cause temporary operational anomalies, damage critical electronics, degrade solar arrays,

and blind optical systems such as imagers and star trackers.

The effects of space weather on modern technological systems are well documented in both the technical lit-

erature and popular accounts. Most often cited perhaps is the collapse within 90 seconds of northeastern Canada’s

Hydro-Quebec power grid during the great geomagnetic storm of March 1989, which left millions of people

without electricity for up to 9 hours. This event exemplifies the dramatic impact that extreme space weather can

have on a technology upon which modern society in all of its manifold and interconnected activities and functions

critically depends.

Nearly two decades have passed since the March 1989 event. During that time, awareness of the risks of

extreme space weather has increased among the affected industries, mitigation strategies have been developed, new

sources of data have become available (e.g., the upstream solar wind measurements from the Advanced Composi-

tion Explorer), new models of the space environment have been created, and a national space weather infrastructure

has evolved to provide data, alerts, and forecasts to an increasing number of users.

Now, 20 years later and approaching a new interval of increased solar activity, how well equipped are we to

manage the effects of space weather? Have recent technological developments made our critical technologies more

or less vulnerable? How well do we understand the broader societal and economic impacts of extreme space weather

events? Are our institutions prepared to cope with the effects of a “space weather Katrina,” a rare, but according

to the historical record, not inconceivable eventuality? On May 22 and 23, 2008, a workshop held in Washington,

D.C., under the auspices of the National Research Council brought together representatives of industry, the federal

government, and the social science community to explore these and related questions. This report was prepared

This executive summary plus thousands more available at http://www.nap.edu

Severe Space Weather Events--Understanding Societal and Economic Impacts Workshop Report

http://books.nap.edu/catalog/12507.html

SEVERE SPACE WEATHER EVENTS—UNDERSTANDING SOCIETAL AND ECONOMIC IMPACTS

by members of the ad hoc committee that organized the workshop, and it summarizes the key themes, ideas, and

insights that emerged during the 1½ days of presentations and discussions.

THE IMPACT OF SPACE WEATHER

Modern technological society is characterized by a complex interweave of dependencies and interdependencies

among its critical infrastructures. A complete picture of the socioeconomic impact of severe space weather must

include both direct, industry-specific effects (such as power outages and spacecraft anomalies) and the collateral

effects of space-weather-driven technology failures on dependent infrastructures and services.

Industry-specific Space Weather Impacts

The main industries whose operations can be adversely affected by extreme space weather are the electric

power, spacecraft, aviation, and GPS-based positioning industries. The March 1989 blackout in Quebec and the

forced outages of electric power equipment in the northeastern United States remain the classic example of the

impact of a severe space weather event on the electric power industry. Several examples of the impact of space

weather on the other industries are cited in the report:

• The outage in January 1994 of two Canadian telecommunications satellites during a period of enhanced

energetic electron fluxes at geosynchronous orbit, disrupting communications services nationwide. The first

satellite recovered in a few hours; recovery of the second satellite took 6 months and cost $50 million to

$70 million.

• The diversion of 26 United Airlines flights to non-polar or less-than-optimum polar routes during several

days of disturbed space weather in January 2005. The flights were diverted to avoid the risk of HF radio black-

outs during PCA events. The increased flight time and extra landings and takeoffs required by such route changes

increase fuel consumption and raise cost, while the delays disrupt connections to other flights.

• Disabling of the Federal Aviation Administration’s recently implemented GPS-based Wide Area Augmenta-

tion System (WAAS) for 30 hours during the severe space weather events of October-November 2003.

With increasing awareness and understanding of space weather effects on their technologies, industries have

responded to the threat of extreme space weather through improved operational procedures and technologies. As

just noted, airlines re-route flights scheduled for polar routes during intense solar energetic particle events in order

to preserve reliable communications. Alerted to an impending geomagnetic storm by NOAA’s Space Weather

Prediction Center (SWPC) and monitoring ground currents in real-time, power grid operators take defensive mea-

sures to protect the grid against geomagnetically induced currents (GICs). Similarly, under adverse space weather

conditions, launch personnel may delay a launch, and satellite operators may postpone certain operations (e.g.,

thruster firings). For the spacecraft industry, however, the primary approach to mitigating the effects of space

weather is to design satellites to operate under extreme environmental conditions to the maximum extent possible

within cost and resource constraints. GPS modernization through the addition of two new navigation signals and

new codes is expected to help mitigate space weather effects (e.g., ranging errors, fading caused by ionospheric

scintillation), although to what degree is not known. These technologies will come on line incrementally over the

next 15 years as new GPS satellites become operational. In the meantime, the Federal Aviation Administration will

maintain “legacy” non-GPS-based navigation systems as a backup, while other GPS users (e.g., offshore drilling

companies) can postpone operations for which precision position knowledge is required until the ionospheric

disturbance is over.

The Collateral Impacts of Space Weather

Because of the interconnectedness of critical infrastructures in modern society, the impacts of severe space

weather events can go beyond disruption of existing technical systems and lead to short-term as well as to long-term

This executive summary plus thousands more available at http://www.nap.edu

Severe Space Weather Events--Understanding Societal and Economic Impacts Workshop Report

http://books.nap.edu/catalog/12507.html

SUMMARY

collateral socioeconomic disruptions. Electric power is modern society’s cornerstone technology, the technology

on which virtually all other infrastructures and services depend. Although the probability of a wide-area electric

power blackout resulting from an extreme space weather event is low, the consequences of such an event could

be very high, as its effects would cascade through other, dependent systems. Collateral effects of a longer-term

outage would likely include, for example, disruption of the transportation, communication, banking, and finance

systems, and government services; the breakdown of the distribution of potable water owing to pump failure; and

the loss of perishable foods and medications because of lack of refrigeration. The resulting loss of services for a

significant period of time in even one region of the country could affect the entire nation and have international

impacts as well.

Extreme space weather events are low-frequency/high-consequence (LF/HC) events and as such present—in

terms of their potential broader, collateral impacts—a unique set of problems for public (and private) institutions

and governance, different from the problems raised by conventional, expected, and frequently experienced events.

As a consequence, dealing with the collateral impacts of LF/HC events requires different types of budgeting and

management capabilities and consequently challenges the basis for conventional policies and risk management

strategies, which assume a universe of constant or reliable conditions. Moreover, because systems can quickly

become dependent on new technologies in ways that are unknown and unexpected to both developers and users,

vulnerabilities in one part of the broader system have a tendency to spread to other parts of the system. Thus, it is

difficult to understand, much less to predict, the consequences of future LF/HC events. Sustaining preparedness

and planning for such events in future years is equally difficult.

Future Vulnerabilities

Our knowledge and understanding of the vulnerabilities of modern technological infrastructure to severe

space weather and the measures developed to mitigate those vulnerabilities are based largely on experience and

knowledge gained during the past 20 or 30 years, during such episodes of severe space weather as the geomagnetic

superstorms of March 1989 and October-November 2003. As severe as some of these recent events have been, the

historical record reveals that space weather of even greater severity has occurred in the past—e.g., the Carrington

event of 1859 1 and the great geomagnetic storm of May 1921—and suggests that such extreme events, though

rare, are likely to occur again some time in the future. While the socioeconomic impacts of a future Carrington

event are difficult to predict, it is not unreasonable to assume that an event of such magnitude would lead to much

deeper and more widespread socioeconomic disruptions than occurred in 1859, when modern electricity-based

technology was still in its infancy.

A more quantitative estimate of the potential impact of an unusually large space weather event has been

obtained by examining the effects of a storm of the magnitude of the May 1921 superstorm on today’s electric

power infrastructure. Despite the lessons learned since 1989 and their successful application during the October-

November 2003 storms, the nation’s electric power grids remain vulnerable to disruption and damage by severe

space weather and have become even more so, in terms of both widespread blackouts and permanent equipment

damage requiring long restoration times. According to a study by the Metatech Corporation, the occurrence today

of an event like the 1921 storm would result in large-scale blackouts affecting more than 130 million people and

would expose more than 350 transformers to the risk of permanent damage.

SPACE WEATHER INFRASTRUCTURE

Space weather services in the United States are provided primarily by NOAA’s SWPC and the U.S. Air Force’s

(USAF’s) Weather Agency (AFWA), which work closely together to address the needs of their civilian and military

user communities, respectively. The SWPC draws on a variety of data sources, both space- and ground-based,

to provide forecasts, watches, warnings, alerts, and summaries as well as operational space weather products to

civilian and commercial users. Its primary sources of information about solar activity, upstream solar wind condi-

tions, and the geospace environment are NASA’s Advanced Composition Explorer (ACE), NOAA’s GOES and

POES satellites, magnetometers, and the USAF’s solar observing networks. Secondary sources include SOHO and

This executive summary plus thousands more available at http://www.nap.edu

Severe Space Weather Events--Understanding Societal and Economic Impacts Workshop Report

http://books.nap.edu/catalog/12507.html

SEVERE SPACE WEATHER EVENTS—UNDERSTANDING SOCIETAL AND ECONOMIC IMPACTS

STEREO as well as a number of ground-based facilities. Despite a small and unstable budget (roughly $6 million

to $7 million U.S. dollars annually) that limits capabilities, the SWPC has experienced a steady growth in customer

base, even during the solar minimum years, when disturbance activity is lower. The focus of the USAF’s space

weather effort is on providing situational knowledge of the real-time space weather environment and assessments

of the impacts of space weather on different Department of Defense missions. The Air Force uses NOAA data

combined with data from its own assets such as the Defense Meteorological Satellites Program satellites, the Com-

munications/Navigation Outage Forecasting System, the Solar Electro-Optical Network, the Digital Ionospheric

Sounding System, and the GPS network.

NASA is the third major element in the nation’s space weather infrastructure. Although NASA’s role is

scientific rather than operational, NASA science missions such as ACE provide critical space weather informa-

tion, and NASA’s Living with a Star program targets research and technologies that are relevant to operations.

NASA-developed products that are candidates for eventual transfer from research to operations include sensor

technology and physics-based space weather models that can be transitioned into operational tools for forecasting

and situational awareness.

Other key elements of the nation’s space weather infrastructure are the solar and space physics research com-

munity and the emerging commercial space weather businesses. Of particular importance are the efforts of these

sectors in the area of model development.

Space Weather Forecasting: Capabilities and Limitations

One of the important functions of a nation’s space weather infrastructure is to provide reliable long-term fore-

casts, although the importance of forecasts varies according to industry. 2 With long-term (1- to 3-day) forecasts

and minimal false alarms, 3 the various user communities can take actions to mitigate the effects of impending solar

disturbances and to minimize their economic impact. Currently, NOAA’s SWPC can make probability forecasts

of space weather events with varying degrees of success. For example, the SWPC can, with moderate confidence,

predict the occurrence probability of a geomagnetic storm or an X-class flare 1 to 3 days in advance, whereas its

capability to provide even short-term (less than 1 day) or long-term forecasts of ionospheric disturbances—infor-

mation important for GPS users—is poor. The SWPC has identified a number of critical steps needed to improve

its forecasting capability, enabling it, for example, to provide high-confidence long- and short-term forecasts of

geomagnetic storms and ionospheric disturbances. These steps include securing an operational solar wind monitor

at L1; transitioning research models (e.g., of coronal mass ejection propagation, the geospace radiation environ-

ment, and the coupled magnetosphere/ionosphere/atmosphere system) into operations, and developing precision

GPS forecast and correction tools. The requirement for a solar wind monitor at L1 is particularly important because

ACE, the SWPC’s sole source of real-time upstream solar wind and interplanetary magnetic field data, is well

beyond its planned operational life, and provisions to replace it have not been made.

UNDERSTANDING THE SOCIETAL AND ECONOMIC IMPACTS OF SEVERE SPACE WEATHER

The title of the workshop on which this report is based, “The Societal and Economic Impacts of Severe Space

Weather,” perhaps promised more than this subsequent report can fully deliver. What emerged from the presenta-

tions and discussions at the workshop is that the invited experts understand well the effects of at least moderately

severe space weather on specific technologies, and in many cases know what is required to mitigate them, whether

enhanced forecasting and monitoring capabilities, new technologies (new GPS signals and codes, new-generation

radiation-hardened electronics), or improved operational procedures. Limited information was also provided—and

captured in this report—on the costs of space weather-induced outages (e.g., $50 million to $70 million to restore

the $290 million Anik E2 to operational status) as well as of non-space-weather-related events that can serve as

proxies for disruptions caused by severe space storms (e.g., $4 billion to $10 billion for the power blackout of

August 2003), and an estimate of $1 trillion to $2 trillion during the first year alone was given for the societal and

economic costs of a “severe geomagnetic storm scenario” with recovery times of 4 to 10 years.

This executive summary plus thousands more available at http://www.nap.edu

Plik z chomika:

Inne pliki z tego folderu:

Inne foldery tego chomika: