|
The GAia Map of the Brightness Of Natural SkyNew! Updated to Gaia-EDR3 catalogue |
About GAMBONS |
|---|
Loading data...
Local Map at
|
|||
|---|---|---|---|
| Date: Hour: Minute: | |||
| Altitude of the Sun above the horizon: |
Airglow and atmospheric parameters 
| Airglow | Spectrum: |
Value (%):
|
|---|---|---|
| Get spectrum from ESO SkyCalc here | ||
| Aerosols | Ångstrom exponent (α): | τ0(λ0): |
Click the Compute button to refresh the map
| Low resolution (faster) |
|---|
Profile at azimut
Show line
|
Profile at azimut
|
Show line |
|---|
Radiance outside Earth's atmosphere
This map on Galactic Coordinates shows the astrophysical radiance (astrophysical sources and background) outside the Earth's atmosphere in W/m2/sr. Click here to download the data.
Show local window
Location
/
Search:
About GAMBONS
GAMBONS (GAia Map of the Brightness Of the Natural Sky) is a model of the natural night brightness of the sky in cloudless and moonless nights. GAMBONS is based on the extra-atmospheric star radiance obtained from the Gaia catalogue. For the brightest stars, not included in Gaia-DR3, we have used the Hipparcos catalogue instead. After adding up to the star radiance the contributions of the diffuse galactic and extragalactic light, zodiacal light and airglow, and taking into account the effects of atmospheric attenuation and scattering, the radiance detected by ground-based observers is estimated. GAMBONS does not include the Moon and Sun contributions.
- Select a location and date.
- Set the airglow and atmospheric parameters:
- Airglow spectrum: the default airglow spectrum is computed from the ESO SkyCalc web page, with a Monthly Averaged Solar Radio Flux equal to 100 sfu.
Values of Solar Radio Flux can be obtained from the Canadian Space Weather Forecast Centre (CSWFC).
Other spectra computed from ESO SkyCalc could be used, if calculated for the Cerro Paranal altitude (2640 m above the sea level) in the wavelength range from 350 nm to 1050 nm.
- Airglow value: a scale factor for the airglow radiance (%).
- The aerosol optical thickness (wavelength dependent) is modelled by:
where α is the socalled Ångstrom exponent, and τ0(λ0) is the aerosol optical thickness of the whole atmosphere, measured along a vertical path, for the reference wavelength λ0=550nm. Both parameters can be set.
- Run the model by clicking the "Compute" button and download the data, if you wish.
- Note: in this web version, the scattering is computed in a simpler but
less accurate way. It consists in replacing τ0(λ) by an effective optical depth τ0(λ)eff = γ τ0(λ), with γ < 1 (see Duriscoe D. M., 2013, PASP, 125, 1370).
The citation for GAMBONS is Masana et al. 2020 (MNRAS, accepted). Download the paper here.
Contact addresses: emasana at fqa.ub.edu (E. Masana; astrophysical sources, website), salva.bara at usc.gal (S. Bará; atmospheric modeling).
- Select a location and date.
- Set the airglow and atmospheric parameters:
- Airglow spectrum: the default airglow spectrum is computed from the ESO SkyCalc web page, with a Monthly Averaged Solar Radio Flux equal to 100 sfu.
Values of Solar Radio Flux can be obtained from the Canadian Space Weather Forecast Centre (CSWFC).
Other spectra computed from ESO SkyCalc could be used, if calculated for the Cerro Paranal altitude (2640 m above the sea level) in the wavelength range from 350 nm to 1050 nm.
- Airglow value: a scale factor for the airglow radiance (%).
- The aerosol optical thickness (wavelength dependent) is modelled by:
where α is the socalled Ångstrom exponent, and τ0(λ0) is the aerosol optical thickness of the whole atmosphere, measured along a vertical path, for the reference wavelength λ0=550nm. Both parameters can be set.
- Run the model by clicking the "Compute" button and download the data, if you wish.
- Note: in this web version, the scattering is computed in a simpler but less accurate way. It consists in replacing τ0(λ) by an effective optical depth τ0(λ)eff = γ τ0(λ), with γ < 1 (see Duriscoe D. M., 2013, PASP, 125, 1370).
The citation for GAMBONS is Masana et al. 2020 (MNRAS, accepted). Download the paper here.
Contact addresses: emasana at fqa.ub.edu (E. Masana; astrophysical sources, website), salva.bara at usc.gal (S. Bará; atmospheric modeling).
