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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: stronglyExpand
The Sun as an X-Ray Star. II. Using theYohkoh/Soft X-Ray Telescope-derived Solar Emission Measure versus Temperature to Interpret Stellar X-Ray Observations
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 diUerences in scope andExpand
Onset of the Magnetic Explosion in Solar Flares and Coronal Mass Ejections
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. TheExpand
Solar flares, microflares, nanoflares, and coronal heating
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 aExpand
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 theExpand
The Sun's luminosity over a complete solar cycle
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 lateExpand
Statistical Study of Solar X-Ray Jets Observed with the YOHKOH Soft X-Ray Telescope
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,Expand
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 partiallyExpand
Sigmoidal morphology and eruptive solar activity
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 classifiedExpand
Solar luminosity variations in solar cycle 21
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 sinceExpand