Sentences with word «magnetogram»

Magnetic field indices derived from synoptic magnetograms of the Mt. Wilson Observatory, i.e. Magnetic Plage Strength Index (MPSI) and Mt. Wilson Sunspot Index (MWSI), are used to study the effects of surface magnetism on total solar irradiance variability during solar cycles 21, 22 and 23.

Before digital observations began, analog magnetograms recorded changes in the Earth's geomagnetic field onto photographic paper.

For periods after 1974, they calculate TSI values based on daily measurements of solar magnetograms.

We use sensitive, 60 - min averaged MDI magnetograms and quasi-simultaneous continuum images as an input to our SATIRE - S model and calculate the TSI variation over cycle 23, sampled roughly every two weeks.

Using two different techniques, we compare magnetograms as well as continuum images recorded by the Spectropolarimeter (SPM) on Kitt Peak and the Michelson Doppler Interferometer (MDI) on board SoHO.

A Japanese team have digitalized magnetogram recordings taken before direct observations by satellites became available.

It was time for Padilla to go up to the top of the tower to adjust the mirror for the afternoon magnetogram observations, so he put on a hard hat and buckled himself into the «elevator,» as the small open bucket is euphemistically called.

Using LOS magnetograms, the authors observed a small region of transient polarity - reversed magnetic field in the main sunspot of NOAA 11429 on 13 March 2012, which corresponded with flare brightenings seen in intensity images.

Right: A time series of line - of - sight magnetograms observed by SDO / HMI, showing active region NOAA 11429.

For the period after 1974, the model makes use of the full - disc magnetograms of the Sun and reproduces up to 97 % of the measured irradiance variation.

A time series of daily magnetograms and empirical models of the thermal structure of magnetic features (sunspots, faculae) are combined to reconstruct total (and spectral) irradiance from 1996 to 2002.

The information needed for this model is derived from Carrington rotation magnetogram and photogram synoptic charts measured with the Michelson Doppler Imager (MDI) instrument on - board the Solar and Heliospheric Observatory (SOHO).

To be able to use both space - and ground - based solar magnetograms and construct long time series of derived parameters it is important to cross-calibrate them so that we can estimate their reliability and combine them.

Nosé and colleagues thus scanned the paper recordings and translated the magnetogram plots into digital data.

Therefore, the sunspot model is significantly less accurate than the magnetogram model on short time scales.

One of the magnetograms from the sidebar should assist.

The background faculae / plage areas on the magnetogram appearing about the same over the decline period.

All four Negative sunspots have followed the same pattern (1101 still in the progress) on the magnetogram.

Thanks to the new SDO satellite we are able to see this process in action via a magnetogram animation they provide daily.

Because our main goal is to reproduce the centennial solar variability and because magnetograms are unavailable for historical time periods, we scale the faculae and the active network filling factors with the sunspot number instead of using filling factors derived from available magnetogram data.

We also present a cross-calibration between the magnetograms obtained by the 512 channel magnetograph and the spectromagnetograph at Kitt Peak.

Different methods of comparing the magnetograms obtained by the two Kitt Peak magnetographs give somewhat different results, with factors by which 512 channel data must be divided in the range 1.38 — 1.63 being found.