Signatures of Interchange Reconnection: STEREO, ACE and Hinode Observations Combined (2009)
Baker, D., Rouillard, A. P., Demoulin, P., Harra, L. K., Lavraud, B., ...
Combining STEREO, ACE and Hinode observations has presented an opportunity to follow a filament eruption and coronal mass ejection (CME) on the 17th of October 2007 from an active region (AR) inside...
THE EXTREME ULTRAVIOLET IMAGER (EUI) ONBOARD THE SOLAR ORBITER MISSION (2009)
Rochus, Pierre, Halain, Jean-Philippe, Renotte, Etienne, Berghmans, David, Zhukov, Andrei, Hochedez, JF, ...
60th International Astronautical Congress
Changes in the solar magnetic field preceding a Coronal Mass Ejection (2007)
Harra Mullard Space, L. K. Harra
The combined observing power of the Yohkoh, SOHO and TRACE spacecrafts, along with the continuing ground-based observations has proved invaluable for the detection of changes in the magnetic...
Lm Mssl Ucl, L. Mcdonald, J. L. Culhane, L. K. Harra
. X-ray bright points (XBPs) are usually assumed to be isolated structures in the solar atmosphere that are powered exclusively by magnetic reconnection. We analyse a large XBP that does not satisfy...
EUV emission lines and diagnostics observed with Hinode/EIS (2007)
Young, P. R., Del Zanna, G., Mason, H. E., Dere, K. P., Landi, E., Landini, M., ...
Quiet Sun and active region spectra from the Hinode/EIS instrument are presented, and the strongest lines from different temperature regions discussed. A list of emission lines recommended to be...
The EUV imaging spectrometer for Hinode (2007)
Culhane, J.L., Harra, L.K., James, A.M., Al-Janabi, K., Bradley, L.J., Chaudry, R.A., ...
The EUV Imaging Spectrometer (EIS) on Hinode will observe solar corona and upper transition region emission lines in the wavelength ranges 170 – 210 Å and 250 – 290 Å. The line centroid...
Coronal "wave": magnetic footprint of a coronal mass ejection? (2007)
Attrill, G.D.R., Harra, L.K., Démoulin, P.
We investigate the properties of two “classical” EUV Imaging Telescope (EIT) coronal waves. The two source regions of the associated coronal mass ejections (CMEs) possess opposite helicities, and...
A multiple flare scenario where the classic long-duration flare was not the source of a CME (2007)
Goff, C.P., Démoulin, P., Culhane, J.L., Matthews, S.A., Harra, L.K., ...
A series of flares (GOES class M, M and C) and a CME were observed in close succession on 20 January 2004 in NOAA 10540. Radio observations, which took the form of types II, III and N bursts, were...
EUI, The Ultraviolet Imaging Telescopes Of Solar Orbiter (2007)
Appourchaux, T., Harra, L. K., Schühle, U., Auchère, F., ...
X-ray observations of solar long-duration flares (2005)
Phillips, K.J.H., Feldman, U., Harra, L.K.
Yohkoh X-ray observations during the several-hour decay of six large solar flares show that the main emitting region is in the form of a bright loop-top source whose spatial extent well after the...
Fazakerley, A.N., Harra, L.K., Culhane, J.L., Lucek, E., Matthews, S.A., ...
A halo coronal mass ejection (CME) was detected on January 20, 2004. We use solar remote sensing data (SOHO, Culgoora) and near-Earth in situ data (Cluster) to identify the CME source event and show...
The Solar-B EUV imaging spectrometer and its science goals (2005)
Culhane, J.L., Harra, L.K., Doschek, G.A., Mariska, J.T., Watanabe, T., Hara, H.
The Solar-B mission includes an Extreme-UV Imaging Spectrometer (EIS). It detects photons in the ranges 170–210 and 250–290 Å which include emission lines from several highly ionised species...
A slow coronal mass ejection with rising X-ray source (2005)
Goff, C.P., Harra, L.K., Matthews, S.A., Mandrini, C.H.
An eruptive event, which occurred on 16th April 2002, is discussed. Using images from the Transition Region and Coronal Explorer (TRACE) at 195 Å, we observe a lifting flux rope which gives rise to...
Mitra-Kraev, U., Harra, L. K., Williams, D. R., Kraev, E.
We present the first X-ray observation of an oscillation during a stellar flare. The flare occurred on the active M-type dwarf AT Mic and was observed with XMM-Newton. The soft X-ray light curve...
The Chinese New Year Interplanetary Coronal Mass Ejection (2005)
Fazarkeley, A. N., Harra, L.K., Matthews, S.A., Owen, C.J., Culhane, J.L., ...
Mitra-Kraev, U., Harra, L. K., Guedel, M., Audard, M., Branduardi-Raymont, G., Kay, H. R. M., ...
We present simultaneous ultraviolet and X-ray observations of the dMe-type flaring stars AT Mic, AU Mic, EV Lac, UV Cet and YZ CMi obtained with the XMM-Newton observatory. During 40 hours of...
Relating magnetic field strengths to hard X-ray emission in solar flares (2004)
Goff, C.P., Matthews, S.A., Harra, L.K.
The observation of hard X-ray (HXR) emission in solar flares provides important diagnostic information about the acceleration and subsequent transport of energetic electrons in the flare process....
What causes solar active region loops to exist at transition region temperatures? (2004)
Harra, L.K., Mandrini, C.H., Matthews, S.A.
High-lying, dynamic loops have been observed at transition region temperatures since Skylab observations. The nature of these loops has been debated for many years with several explanations having...
Book description: This invaluable book provides an introduction to space science. It brings together the various space science disciplines in one volume, and will benefit a wide audience,...
Evidence of flaring in a transequatorial loop on the sun (2003)
We present evidence of flaring behavior in a transequatorial loop (TEL) that lights up in soft X-rays on 2000 July 13. The large loop structure connects NOAA Active Regions 9070/9066 in the northern...
Using spectral data from the Coronal Diagnostic Spectrometer (CDS) instrument on the Solar and Heliospheric Observatory spacecraft, we observe a coronal wave feature (often referred to as an EIT...
Material outflows from coronal intensity “dimming regions” during coronal mass ejection onset (2001)
One signature of expulsion of coronal mass ejections (CMEs) from the solar corona is the appearance of transient intensity dimmings in coronal images. These dimmings have generally been assumed to be...
Coronal mass ejections and their association to active region flaring (2001)
Green, L.M., Harra, L.K., Matthews, S.A., Culhane, J.L.
Since the discovery of coronal mass ejections (CMEs), flaring has been thought to be associated in some way with the ejection in either cause or effect. When CMEs were first discovered in the 1970s...
Properties of EUV and X-ray emission in solar active regions (2001)
Matthews, S.A., Klimchuk, J.A., Harra, L.K.
Using observations from the Coronal Diagnostic Spectrometer (CDS) on SoHO and the Soft X-ray Telescope (SXT) on Yohkoh we investigate how the spatial properties of active region emission observed in...
Characteristics of Quiet Sun Cell and Network Brightenings (2000)
. Extreme ultraviolet observations of the quiet Sun are made with the Coronal Diagnostic Spectrometer (cds) on board the Solar and Heliospheric Observatory (soho). It has been previously noted that...