An exceptionally bright flare from SGR 1806–20 and the origins of short-duration γ-ray bursts
Soft-γ-ray repeaters (SGRs) are galactic X-ray stars that emit numerous short-duration (about 0.1 s) bursts of hard X-rays during sporadic active periods. They are thought to be magnetars: strongly…
The Sun as an X-Ray Star. II. Using the Yohkoh/Soft X-Ray Telescope-derived Solar Emission Measure versus Temperature to Interpret Stellar X-Ray Observations
- G. Peres, S. Orlando, F. Reale, R. Rosner, H. Hudson
- Physics
- 2000
This paper is the second of a project dedicated to using solar Yohkoh/SXT data as a guide and a template to interpret data on stellar coronae. In the light of the large differences in scope and…
Solar flares, microflares, nanoflares, and coronal heating
- H. Hudson
- Physics
- 1 June 1991
Solar flare occurrence follows a power-law distribution against total flare energy W: dN/dW ∼ W−α with an index α ∼ 1.8 as determined by several studies. This implies (a) that microflares must have a…
Onset of the Magnetic Explosion in Solar Flares and Coronal Mass Ejections
- R. Moore, A. Sterling, H. Hudson, J. Lemen
- Physics
- 10 May 2001
We present observations of the magnetic field configuration and its transformation in six solar eruptive events that show good agreement with the standard bipolar model for eruptive flares. The…
The Sun's luminosity over a complete solar cycle
- R. Willson, H. Hudson
- PhysicsNature
- 2 May 1991
THE Active Cavity Radiometer Irradiance Monitor (ACRIM I), an instrument carried on NASA's Solar Maximum Mission satellite, measured the Sun's luminosity (total power outflow) from early 1980 to late…
The Reuven Ramaty High-Energy Solar Spectroscopic Imager (RHESSI)
RHESSI is the sixth in the NASA line of Small Explorer (SMEX) missions and the first managed in the Principal Investigator mode, where the PI is responsible for all aspects of the mission except the…
Statistical Study of Solar X-Ray Jets Observed with the YOHKOH Soft X-Ray Telescope
- M. Shimojo, S. Hashimoto, K. Shibata, T. Hirayama, H. Hudson, L. Acton
- Physics
- 1 February 1996
From a statistical study of 100 X-ray jets, found from the database of full Sun images taken with the Soft X-ray Telescope (SXT) aboard Yohkoh during the period between November 1991 and April 1992,…
Solar luminosity variations in solar cycle 21
- R. Willson, H. Hudson
- Physics, Environmental ScienceNature
- 28 April 1988
The ACRIM I experiment (Active Cavity Radiometer Irradiance Monitor) on the solar maximum Mission (SMM) satellite has provided a nearly continuous record of solar total irradiance variations since…
Sigmoidal morphology and eruptive solar activity
- R. Canfield, H. Hudson, D. McKenzie
- Physics, Geology
- 15 March 1999
Soft X‐ray images of solar active regions frequently show S‐ or inverse‐S (sigmoidal) morphology. We have studied the Yohkoh Soft X‐Ray Telescope video movie for 1993 and 1997. We have classified…
MEASUREMENTS OF THE CORONAL ACCELERATION REGION OF A SOLAR FLARE
- S. Krucker, H. Hudson, R. Lin
- Physics
- 16 April 2010
The Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) and the Nobeyama Radioheliograph (NoRH) are used to investigate coronal hard X-ray and microwave emissions in the partially…
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