Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Team Makes NASA’s Hi-C Flight a Success

28.01.2013
Work done in part by The University of Alabama has enabled a group of solar scientists to see into the sun’s corona in unprecedented detail.

Scientists and engineers from the Smithsonian Astrophysical Observatory (SAO), Marshall Space Flight Center and UAHuntsville teamed to align mirrors on the High Resolution Coronal Imager, or Hi-C.

Following that work, the imager captured the highest-resolution images ever taken of the million-degree solar corona, using a resolution five times greater than previous imagers. Hotter than the solar surface, the corona is where solar flares occur and release energy that drives solar storms that can impact Earth.

The imager’s high-quality optics were aligned with extreme accuracy. Mounting of the mirrors in the telescope was done using a new method that significantly reduced the impact of the process on the shape of the mirrors.

Weighing 464 pounds, the 6-foot-long Hi-C telescope took 165 images during a brief 620-second sounding rocket flight July 11. The telescope focused on a large active region on the sun. Some images reveal the dynamic structure of the solar atmosphere in fine detail. When combined with the full sun images from NASA’s Solar Dynamics Observatory (SDO), they provide a new picture of the solar corona.

The mirror alignment work involved maintaining optic spacing to within a few ten-thousandths of an inch. This innovative approach to aligning and installing the mirrors then had to be maintained so the instrument could survive the harsh vibration and thermal conditions during launch and flight of the rocket.

Hi-C's mirrors are approximately 9.5 inches across, roughly the same size as the SDO instrument’s mirrors. However, due to a set of innovations on Hi-C’s optics array, the nimble telescope was able to peer deeper into the sun’s corona in the extreme ultraviolet wavelength.

“These mirrors were to be the finest pieces of glass ever fabricated for solar astrophysics,” said Marshall heliophysicist Dr. Jonathan Cirtain, principal investigator on the Hi-C mission. “We had never attempted such a program before and had to develop new techniques for grinding the optics and polishing the surfaces, not to mention figuring out how to mount them without diminishing the performance. The final mirror surface is so smooth that it only deviates from being perfectly smooth by a few angstroms over the 24 cm optic.”

Using these quality optics, images were acquired at a rate of approximately one every five seconds and provided proof of a long-standing theory to explain solar coronal dynamics.

The optical design was provided by scientists and engineers from Marshall’s Science and Technology Office as well as SAO personnel. “Dr. Cirtain asked us to develop the mirrors initially to see how well we could make them,” said John Calhoun, Lead for Optics at Marshall. “The initial specifications were only a goal; however, we made such excellent progress on them that Dr. Cirtain was able to get the funding for his flight demonstration. Credit belongs to the superb work performed by our senior opticians, although their initial response to the very challenging fabrication was to refer to the optics as the ‘oh, my god’ mirrors.”

Scientists at Lededev Physical Institute in Moscow, Russia developed the filters for the instrument front aperture plate. These whisper-thin filters reject the unwanted wavelengths of light and only transmit the extreme ultraviolet spectrum.

Scientists have worked for the better part of a decade designing and building test facilities, followed by development, fabrication and testing of the optics.

"This flight represents the culmination of thirty-years of effort to develop these exceptionally high quality optics," said Co-investigator Dr. Leon Golub of SAO.

Marshall scientists and engineers also partnered with engineers from the University of Central Lancashire and Apogee Imaging Systems in Richmond, CA to develop a large format camera detector (16 megapixel) with a high speed image readout. The combination of the optics, the telescope and the camera system combined to deliver the highest cadence and highest resolution image set yet collected for the solar million degree atmosphere.

“As for the findings from Hi-C, the most important implication to me is the realization that at 150 km spatial resolution and an image cadence of 5 seconds, solar astrophysics can make multiple major advances in the science of how stars work and evolve,” said Cirtain. “That, I find, is breathtaking, especially for a sounding rocket to discover.”

Partners associated with the development of the Hi-C telescope also include Lockheed Martin's Solar Astrophysical Laboratory in Palo Alto, Calif.; the University of Central Lancashire in Lancashire, England; the Lebedev Physical Institute of the Russian Academy of Sciences in Moscow; and the Southwest Research Institute in Boulder, Colo.

The research is being published in the journal Nature in a paper co-authored by Cirtain, Golub, A. Winebarger (Marshall), B. De Pontieu (Lockheed Martin), K. Kobayashi (The University of Alabama in Huntsville), R. Moore (Marshall), R. Walsh (University of Central Lancashire), K. Korreck, M. Weber and P. McCauley (CfA), A. Title (Lockheed Martin), S. Kuzin (Lebedev Physical Institute), and C. DeForest (Southwest Research Institute).

Jim Seele | Newswise
Further information:
http://www.uah.edu

More articles from Physics and Astronomy:

nachricht Space radiation won't stop NASA's human exploration
18.10.2017 | NASA/Johnson Space Center

nachricht Study shows how water could have flowed on 'cold and icy' ancient Mars
18.10.2017 | Brown University

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Neutron star merger directly observed for the first time

University of Maryland researchers contribute to historic detection of gravitational waves and light created by event

On August 17, 2017, at 12:41:04 UTC, scientists made the first direct observation of a merger between two neutron stars--the dense, collapsed cores that remain...

Im Focus: Breaking: the first light from two neutron stars merging

Seven new papers describe the first-ever detection of light from a gravitational wave source. The event, caused by two neutron stars colliding and merging together, was dubbed GW170817 because it sent ripples through space-time that reached Earth on 2017 August 17. Around the world, hundreds of excited astronomers mobilized quickly and were able to observe the event using numerous telescopes, providing a wealth of new data.

Previous detections of gravitational waves have all involved the merger of two black holes, a feat that won the 2017 Nobel Prize in Physics earlier this month....

Im Focus: Smart sensors for efficient processes

Material defects in end products can quickly result in failures in many areas of industry, and have a massive impact on the safe use of their products. This is why, in the field of quality assurance, intelligent, nondestructive sensor systems play a key role. They allow testing components and parts in a rapid and cost-efficient manner without destroying the actual product or changing its surface. Experts from the Fraunhofer IZFP in Saarbrücken will be presenting two exhibits at the Blechexpo in Stuttgart from 7–10 November 2017 that allow fast, reliable, and automated characterization of materials and detection of defects (Hall 5, Booth 5306).

When quality testing uses time-consuming destructive test methods, it can result in enormous costs due to damaging or destroying the products. And given that...

Im Focus: Cold molecules on collision course

Using a new cooling technique MPQ scientists succeed at observing collisions in a dense beam of cold and slow dipolar molecules.

How do chemical reactions proceed at extremely low temperatures? The answer requires the investigation of molecular samples that are cold, dense, and slow at...

Im Focus: Shrinking the proton again!

Scientists from the Max Planck Institute of Quantum Optics, using high precision laser spectroscopy of atomic hydrogen, confirm the surprisingly small value of the proton radius determined from muonic hydrogen.

It was one of the breakthroughs of the year 2010: Laser spectroscopy of muonic hydrogen resulted in a value for the proton charge radius that was significantly...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

ASEAN Member States discuss the future role of renewable energy

17.10.2017 | Event News

World Health Summit 2017: International experts set the course for the future of Global Health

10.10.2017 | Event News

Climate Engineering Conference 2017 Opens in Berlin

10.10.2017 | Event News

 
Latest News

Osaka university researchers make the slipperiest surfaces adhesive

18.10.2017 | Materials Sciences

Space radiation won't stop NASA's human exploration

18.10.2017 | Physics and Astronomy

Los Alamos researchers and supercomputers help interpret the latest LIGO findings

18.10.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>