First Solar Dynamic Observatory Instrument Arrives at Goddard

Sep 07, 2007
SDO spacecraft
Artist rendition of the SDO spacecraft. Credit: NASA

The University of Colorado at Boulder delivered the Extreme Ultraviolet Variability Experiment (EVE), first of three Solar Dynamic Observatory instruments, to NASA Goddard Space Flight Center, Greenbelt, Md. EVE will measure how much the sun's ultraviolet brightness changes.

Rapid changes in the ultraviolet radiation of the sun can cause outages in radio communications and affect satellites orbiting the Earth. Increases in solar ultraviolet radiation from flares heat Earth's upper atmosphere, causing it to expand. The expansion makes the air more dense at low-Earth-orbit altitudes, where many satellites fly. The more dense air increases the drag on these satellites, slowing them down and causing them to prematurely burn up in the lower atmosphere if there is no more fuel onboard to give them a boost.

EVE will take measurements of the sun's ultraviolet brightness as often as every ten seconds, providing space weather forecasters with warnings of communications and navigation outages.

The sun's extreme ultraviolet output constantly changes. The small solar flares that happen almost every day can double the output while the large flares that happen about once a month can increase the ultraviolet a 1000 times in minutes. This harmful ultraviolet radiation is completely absorbed in the atmosphere, which means we can only observe it from satellites.

"LASP is very excited about delivering the state-of-the-art EVE instrument to measure the solar extreme ultraviolet irradiance with best ever spectral resolution and time cadence," said Tom Woods, SDO EVE Principal Investigator. "These future SDO EVE measurements are important for many different space weather applications such as how solar storms can degrade or even disrupt our navigation and communications."

After launch SDO will study how solar activity is created and how space weather comes from that activity. SDO is designed to help us understand the sun's influence on Earth and near-Earth space by studying the solar atmosphere on small scales of space and time and in many wavelengths simultaneously.

SDO’s other instruments include Helioseismic and Magnetic Imager (HMI) and Atmospheric Imaging Assembly (AIA). Those instruments are expected to arrive at Goddard by the end of October.

"These three instruments together will enable scientists to better understand the causes of violent solar activity, and whether it's possible to make accurate and reliable forecasts of space weather," said Liz Citrin, SDO Project Manager at NASA Goddard. "SDO will provide a full disk picture of the sun in Super HD quality."

SDO is the first mission of NASA's Living With a Star program, which seeks to understand the causes of solar variability and its impacts on Earth. SDO is being designed, managed, and assembled at NASA Goddard. HMI is being built by Stanford University, Stanford, Calif. AIA is being built by the Lockheed Martin Solar Astrophysics Laboratory (LMSAL), Palo Alto, Calif. EVE is being built by the University of Colorado.

SDO is expected to launch no earlier than August 2008.

Source: by Rani Gran, Goddard Space Flight Center

Explore further: Rosetta spacecraft sees sinkholes on comet

Related Stories

Using a sounding rocket to help calibrate NASA's SDO

May 19, 2015

Watching the sun is dangerous work for a telescope. Solar instruments in space naturally degrade over time, bombarded by a constant stream of solar particles that can cause a film of material to adhere to ...

Why NASA observes the Sun in different wavelengths

Jan 23, 2013

(Phys.org)—Taking a photo of the sun with a standard camera will provide a familiar image: a yellowish, featureless disk, perhaps colored a bit more red when near the horizon since the light must travel ...

NASA sees the sun having a solar blast (w/ video)

Jun 07, 2011

The Sun unleashed an M-2 (medium-sized) solar flare, an S1-class (minor) radiation storm and a spectacular coronal mass ejection (CME) on June 7, 2011 from sunspot complex 1226-1227. The large cloud of particles ...

Recommended for you

Rosetta spacecraft sees sinkholes on comet

8 hours ago

The European Space Agency's Rosetta spacecraft first began orbiting comet 67P/Churyumov-Gerasimenko in August 2014. Almost immediately, scientists began to wonder about several surprisingly deep, almost perfectly ...

Me and my world: The human factor in space

11 hours ago

The world around us is defined by how we interact with it. But what if our world was out of this world? As part of NASA's One-Year Mission, researchers are studying how astronauts interact with the "world" ...

Radar guards against space debris

12 hours ago

Space debris poses a growing threat to satellites and other spacecraft, which could be damaged in the event of a collision. A new German space surveillance system, schedu- led to go into operation in 2018, will help to prevent ...

Why we need to keep adding leap seconds

14 hours ago

Today at precisely 10am Australian Eastern Standard time, something chronologically peculiar will take place: there'll be an extra second between 09:59:59 and 10:00:00.

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.