New study seeks to identify and minimize danger to aviation from cosmic radiation

October 22, 2003

WASHINGTON - Scientists have long known of the potential risk from cosmic rays and other aspects of space weather, such as streams of protons from the Sun, to airline electronic systems, passengers, and crews. It has not been feasible to quantify this risk, however, as systematic data are lacking on the actual amount of rays and the charged particles and neutrons they create in Earth's atmosphere that are encountered during typical flights. Researchers have now begun collecting that information, thanks to a newly developed instrument, the Low Linear-Energy-Transfer Radiation Spectrometer (LoLRS).

The need to know the precise level of cosmic and solar radiation along air routes has become more acute, as recent generations of commercial aircraft use "fly-by-wire" control systems, managed by on-board computers, which are subject to damage by high radiation levels. Future aircraft will employ even more sensitive technologies, and will therefore be more susceptible to damage.

"This substantially increases the need to improve the definition of the atmospheric radiation field as a function of location and time, and to reduce the significant uncertainties associated with present day predictions," says Epaminondas G. Stassinopoulos of NASA's Goddard Space Flight Center, lead researcher of the project. Their report is one of the first papers published in the American Geophysical Union's new journal, Space Weather.

With the cooperation of Evergreen International Airlines, which flies long distance cargo routes, LoLRS instruments have been flown aboard Boeing 747s across the Atlantic and Pacific Oceans, across the United States, the length of Africa, and, more recently, in the Arctic. Repetitive flights over the same routes have enabled the scientists to begin studying the long term effects of solar and environmental influences at aviation altitudes.

During each flight, every change in the plane's altitude and direction is recorded, because such factors as weather and traffic affect the exact route and altitude of a flight, regardless of the original flight plan. It is essential for the researchers to know the precise location, altitude, and time of each radiation measurement.

Ultimately, Stassinopoulos and his colleagues hope to produce global maps that reflect the dynamic nature of the atmospheric radiation field. This will require the collection of a large quantity of data, and the researchers are therefore developing techniques for analyzing the collected information. The research will involve both aircraft and high altitude balloons that circle the polar regions for long periods.

The preliminary tests have confirmed that doses of radiation from cosmic rays and the particles they create are more intense at higher altitudes and at higher latitudes; that is, they are strongest in the Arctic and Antarctic regions. This is particularly true during solar storms, during which large quantities of charged particles reach Earth's atmosphere. The scientists hope that the new study will go far beyond previous research in this field and facilitate the construction of models that would be of real use for planners of aircraft routes.
AGU is providing free, open access to the journal Space Weather from its launch, planned for 28 October, through 31 March 2004. The journal will include technical articles, news items, feature stories, editorials, and opinion articles. A quarterly paper edition will print a selection of the material previously published online. Space Weather may be found at For further information, see AGU Press Release 03-05 at

American Geophysical Union

Related Radiation Articles from Brightsurf:

Sheer protection from electromagnetic radiation
A printable ink that is both conductive and transparent can also block radio waves.

What membrane can do in dealing with radiation
USTC recently found that polymethylmethacrylate (PMMA) and polyvinyl chloride (PVC) can release acidic substance under γ radiation, whose amount is proportional to the radiation intensity.

First measurements of radiation levels on the moon
In the current issue (25 September) of the prestigious journal Science Advances, Chinese and German scientists report for the first time on time-resolved measurements of the radiation on the moon.

New biomaterial could shield against harmful radiation
Northwestern University researchers have synthesized a new form of melanin enriched with selenium.

A new way to monitor cancer radiation therapy doses
More than half of all cancer patients undergo radiation therapy and the dose is critical.

Nimotuzumab-cisplatin-radiation versus cisplatin-radiation in HPV negative oropharyngeal cancer
Oncotarget Volume 11, Issue 4: In this study, locally advanced head and neck cancer patients undergoing definitive chemoradiation were randomly allocated to weekly cisplatin - radiation {CRT arm} or nimotuzumab -weekly cisplatin -radiation {NCRT arm}.

Breaking up amino acids with radiation
A new experimental and theoretical study published in EPJ D has shown how the ions formed when electrons collide with one amino acid, glutamine, differ according to the energy of the colliding electrons.

Radiation breaks connections in the brain
One of the potentially life-altering side effects that patients experience after cranial radiotherapy for brain cancer is cognitive impairment.

Fragmenting ions and radiation sensitizers
The anti-cancer drug 5-fluorouracil (5FU) acts as a radiosensitizer: it is rapidly taken up into the DNA of cancer cells, making the cells more sensitive to radiotherapy.

'Seeing the light' behind radiation therapy
Delivering just the right dose of radiation for cancer patients is a delicate balance in their treatment regime.

Read More: Radiation News and Radiation Current Events is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to