Linewidths of low-degree acoustic modes of the sun

Bibcode
1990MNRAS.242..135E
Elsworth, Y.; Isaak, G. R.; Jefferies, S. M.; McLeod, C. P.; New, R.; Pallé, P. L.; Régulo, C.; Roca-Cortés, T.
Bibliographical reference

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 242, Jan. 1, 1990, p. 135-140. Research supported by SERC and CAICYT.

Advertised on:
1
1990
Number of authors
8
IAC number of authors
3
Citations
25
Refereed citations
22
Description
Estimates of the spectral linewidths of low degree (l = 0 and l = 1), 5-min p-modes obtained from Doppler shift observations in 1984 (63 d) and 1986 (63 d) are reported. The observed linewidths increase from 0.5 micro-Hz at 2000 micro-Hz to 3 micro-Hz at 3800 micro-Hz for l = 0. Comparison with other data suggests that for a given frequency the linewidth increases with increasing values of l. On the assumption that the linewidth is substantially due to damping processes, the linewidths are consistent with e-folding times between 3.7 and 0.6 d.
Type
Refereed
Helioseismology
Solar oscillations
Solar atmosphere

It may interest you

  • Refereed
    An ultra-short-period super-Earth with an extremely high density and an outer companion
    We present the discovery and characterization of a new multi-planetary system around the Sun-like star K2-360 (EPIC 201595106). K2-360 was first identified in K2 photometry as the host of an ultra-short-period (USP) planet candidate with a period of 0.88 d. We obtained follow-up transit photometry, confirming the star as the host of the signal
    Livingston, John H. et al.

    Advertised on:

    11
    2024
    Bibcode
    2024NatSR..1427219L
    Citations
    0
  • Refereed
    Neural calibration of imaging Stokes polarimeters
    Current polarimetric calibration techniques derive the instrument modulation matrix by numerically fitting an instrumental model to measurements of a set of calibration Stokes vectors. These techniques are typically limited to an error on the retrieved normalized Stokes Q, U and V parameters, in the $1\times10^{-2}$ to $1\times10^{-3}$ range. This
    Iglesias, F. A. et al.

    Advertised on:

    8
    2024
    Bibcode
    2024BAAA...65..281I
    Citations
    0
  • Refereed
    Model-based identification of solar coronal mass ejections using deep neural networks
    Coronal mass ejections (CMEs) are a major driver of space weather and thus can have important negative technological and social impacts. To assess their geoeffectiveness once they are ejected, it is crucial their prompt identification in coronagraph images. In the last decade, deep neural networks (DNN) have experienced enormous improvements in
    Iglesias, F. A. et al.

    Advertised on:

    8
    2024
    Bibcode
    2024BAAA...65...17I
    Citations
    0