Correct lighting of second texture

Hello. I’m trying to draw Earth with two textures - surface map and cloud map with lighting. Surface is being drawn with GL_MODULATE mode, and it’s lighting is OK, but I have to specify GL_DECAL for the cloud map, because GL_MODULATE gives weird result for me. The only problem is there is no lighting for cloud map in GL_DECAL mode. This is the code fragment:

        if (earthtex[ti])
        {
            glEnable(GL_TEXTURE_2D);
            glBindTexture(GL_TEXTURE_2D, earthtex[ti]);
            glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
            if (cloudtex[ti])
            {
                glActiveTextureARB(GL_TEXTURE1_ARB);
                glEnable(GL_TEXTURE_2D);
                glEnable(GL_ALPHA_TEST);
                glEnable(GL_BLEND);
                glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
                glColor4f(1.0f, 1.0f , 1.0f, 1.00f);
                glBindTexture(GL_TEXTURE_2D, cloudtex[ti]);
                glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
                glActiveTextureARB(GL_TEXTURE0_ARB);
            }
        }

Both textures are in ARGB format, but only the cloud map has real alpha component.

The resulting image is here

.

And the image with GL_MODULATE for upper part is here:
.

It blends with blue color of the “atmosphere”.

What I’m doing wrong? How to do correct lighting for the cloud map?

Thanks,

Andy